Showing posts with label Industrial Goods and Services. Show all posts
Showing posts with label Industrial Goods and Services. Show all posts
CNC Machines
What is a CNC Machine? CNC stands for Computer Numeric Control. Sounds complicated, but it isn’t. Years ago, it was just NC, or Numeric Control. Since, they’ve added computers to control the machine.
In the simplest of terms, think of a drill press. It’s a machine that drills holes. But before you can drill the hole, you have to loosen the chuck, install the correct drill bit, drill the hole in the correct place, turn off the drill, and remove the drill bit. Manually, this could be time consuming and cause fatigue over the course of numerous parts. This is a simple example, but throw in some lathe or milling machining and you have a greater chance for error.
With the CNC machine, all of this drilling can be done automatically instead of the manual process listed above. Machining has to be precise, and whether you use a CNC lathe or milling machine, you have to make sure the part is right. The computer takes a lot of the guesswork out of the machining of these parts. In fact, a CNC programmer can sometimes get bored watching the machine do all the work.
But there is more programming for the machine than you would think. The operator has to enter a set of instructions. The programming uses about 50 words and tells the machine how fast, how deep, and location for machining.
What can you do with a CNC machine? In manufacturing, you can use this tool for milling, drilling, reaming, boring and counter boring. You can also groove and thread parts in a CNC turning center. You may have several setups including CNC lathes, CNC drill and tap area, CNC milling, or even CNC grinding.
EDM (electrical discharge machining) can also take advantage of CNC operations. EDM can be either vertical or wire. A vertical EDM machine uses an electrode to make a cavity for a plastic injection-molding machine. A wire EDM machine uses a wire to cut metal for a tooling operation for fabrication. EDM is more closely related to making tooling for other machines, people often overlook the use of CNC with these machines.
CNC machines can also be used with routers in the wood industry. CNC can also be used with lettering and engraving.
I hope this gave you some basic information about what a CNC machine is and what they are used for.
Stuart Simpson
http://www.cnc-machine-review.com
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The 3 Options You Have in Obtaining Your Own CNC Router
Deciding on the purchase of CNC Router is not always the most attractive prospect. The upfront cost of a router can be a bit intimidating and cause a great deal of reluctance.
What I will do here is discuss the top 3 choices you will have in the acquisition of a CNC Router.
1. Buy Brand New
This is the most obvious prospect. There are some major benefits to purchasing a brand new CNC Router, the 1st of which is that you can rest easy knowing that your machine is brand new and most likely will not have any major mechanical difficulties for some time. The 2nd is that in 9 out of 10 cases you will receive some type of warranty from the company you purchase from; a benefit you will not receive from the other two options.
2. Buy Used
This is probably the most popular option of the 3. You can find plenty of resources online that sell used CNC Routers and I'm sure that you can receive an excellent bargain.
In my opinion, this option should only be resorted to if you absolutely cannot afford a new machine.
Why?
Because you have no idea what you are getting yourself into. Traditionally, you will not get any warranty with your CNC Router purchase or any assurance that the machine has not experienced major mechanical challenges in the past. However, if you can be sure that your source is reliable and trustworthy, then go for it! This option will save you about half the cost of a new CNC Router.
3. Build your own.
What!?
That's right, I said it. Build your own!
Now if you are anything like me, this is not a very inviting option. However, if you are the naturally crafty type this project may be a lot of fun and very rewarding. Again, you will easily find all of the necessary resources for this task online.
Well, there you have it! The top 3 options mixed in with a little bit of my opinion.
For more information on CNC Router or visit http://www.ez-router.com.
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Important information about CNC Hot Wire Foam Cutting Machines
What is a hot wire cnc foam cutter used for?
Hot wire foam cutters will cut different types of foam, from insulation to fabrication, from logos, surfboards and signs to crown moldings and concrete molds
Hot wire foam cutters are designed to cut different types of foam
- EPS – expanded polystyrene
- XPS – extruded polystyrene
- EPP – expanded polypropylene
Not to be used for cutting polyurethane – will result in toxic fumes
What are the main components that a foam cutter is made of?
- The software is divided into two sections – design software to design the shapes to be cut, and the cutting software that controls the machine
- The hot wire tensioning mechanism
- Effective cutting sizes for the horizontal, vertical and the wire length
- Number of axis – a 4 axis machine will be able to cut tapered shapes (like a cone or a jet wing)
Here are some features to look for in a hot wire foam cutting machine:
For production of crown molding:
- Multiple wires – from 3 to 8 wires will increase the cutting capacity from 2 to 7 times
- 8 foot effective wire length – don’t settle for a 4’ machine
- If primary use of the machine is to cut logos and signs – a smaller machine will do the job
- Cutting speed – mostly material dependent – as a rule of thumb: the higher the foam density – the slower the cutting speed
Foam cutting machines have many applications. They can be used to cut architectural shapes, for packaging, building, construction, hobbies, RC Planes, sculptures, monuments, theme parks, props, aeronautics, aerospace and much more.
Hot Wire CNC Foam Cutter prices:
CNC foam cutters will range from $1500 to $50,000. The price is a factor of the machine size, the number of wires, the way the wires are kept under tension.
Other foam cutting machines:
Another way to cut foam is with a CNC router – this is mainly for machining the foam and not for cutting.
CNC routers for foam are mostly used for 3D shapes seen in Las Vegas, theme parts and even signs
Foam coating: EPS and XPS will melt if painted with oil-based paint. Painting is composed of two steps:
- Preparing the foam for coating – a primer should be used to prevent the coating material to penetrate the EPS beads
- Coating – Coating is usually Epoxy (usually brushed) or Polyurethane (brushed or sprayed)
Once the foam is coated – it can be painted with any type of paint.
Cutting EPS Foam:
Expanded polystyrene is very easily cut with a hot-wire foam cutter, which is easily made
by a heated and taut length of wire, usually nichrome due to nichrome's resistance to
oxidation at high temperatures and its suitable electrical conductivity. The hot wire
foam cutter works by heating the wire to the point where it can vaporize foam immediately
adjacent to it. The foam gets vaporized before actually touching the heated wire,
which yields exceptionally smooth cuts.
Polystyrene, shaped and cut with hot wire foam cutters, is used in architecture models,
actual signage, amusement parks, movie sets, airplane construction, and much more.
Such cutters may cost just a few dollars (for a completely manual cutter) to tens of
thousands of dollars for large CNC machines that can be used in high-volume industrial production.
Polystyrene can also be cut with a traditional cutter. In order to do this without ruining
the sides of the blade one must first dip the blade in water and cut with the blade at
an angle of about 30ยบ. The procedure has to be repeated multiple times for best results.
Polystyrene can also be cut on 3 and 5-axis CNC routers, enabling large-scale
prototyping and model-making. Special polystyrene cutters are available that
look more like large cylindrical rasps.
by: Tal Barnea
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Cnc Windows Software
CNC is a technique whereby the movement of a router head is controlled by instructions from a computer. These instructions come from a computer program or list that the user keys into the CNC 860 console or into a computer as ISO standard commands called 'G' codes.As an example, the code G01 X100 Y100, instructs the head to move in a straight line to a point horizontally and vertically 100mm away from its starting position.
The CNC 860 The Trend CNC package is based around the Elu/DeWalt CNC 860 Machining Centre, which has a machining area of 860mm x 860mm x 90mm. These dimensions relate to the three axes, X,Y and Z (width, length and height). Each axis is served by a separate stepper motor, controlling the movement of the routing head. Two head options are offered: a modified portable router or a continuously rated, high cycle motor, that provides improved performance for intensive machining applications.
Programming directly in G-codes through the console can be time consuming. To assist the operator, a PC software application called CNCTalk is included with the machine. This is a basic computer aided design (CAD) application which runs under DOS, the original PC operating system before Windows. It is useful for intermediate applications like cutting out irregular shapes. However, to gain the maximum versatility from the CNC 860,Trend's Open Sign System Software for Windows is the most effective solution.
OSS consists of two separate software applications: OSS Draw which provides the drawing tools to create any shape or sign, and OSS Work which handles all the routing and tooling-related parameters like depth and offset. Graphical simulations are shown for all tool parameters enabling the user to perfect a design before routing any material.
Sign-writing As an example of how these products work together, the method of producing a simple sign is shown, incorporating two different lettering styles and a graphical logo. Having launched OSS Draw, the first step is to draw a box or boarder on the screen to indicate the overall area of the work. This can be either a simple rectangular boarder or a more decorative one. This border then needs to have a depth assigned to it. This is done by using colours to define the depth of each area.
The logo is then created using the drawing tools within OSS Draw. The words are keyed in using the text function. Again, colours are assigned to each area to produce a graphical representation of how the finished sign will look. The next task is to define the routing parameters. In the example, the red and blue areas of the logo and the lettering have been assigned a depth of 5mm and the green area assigned a depth of zero. The same dialogue box lets you specify whether a letter or object is engraved or routed through the material. The cutter profile that will be used can now be defined. With lettering, particularly serifed fonts, the cutter used needs to have a small diameter, perhaps 3mm. However, to achieve a 5mm cutting depth this will have to be routed in several passes.
A simulation of the cutting path is now drawn on screen. Having then created a G-code file of the sign ready for the CNC 860 to cut, the file is downloaded to the CNC 860. The design can now be routed, the material being held on the bed by an adaptable clamping mechanism. From the simulation, the path that the tool will take is known allowing a datum point to be set using the zero key on the console, and the program 8 INProfile is run using the start key. This type of routing operation takes around 20 minutes to complete and requires no further involvement by the machine operator. Other accessories Sign-writing is just one of the many complex and wide ranging routing operations that can be carried out using the OSS and CNC 860 package. OSS also has a range of tools for drawing component shapes and profiles directly or with an electronic sketchpad (graphics tablet). Vacuum Clamping To reduce the through-put time for this kind of operation, the CNC 860 can also be used with a vacuum bed. Trend offer a complete range of affordable vacuum pumps and jigmaking accessories to enable all CNC users to produce a highly automated production system to suit their own specific requirements.
Article Source: http://www.articlesnatch.com
About the Author:
Paul Disley is a woodworking expert at Trend Router
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CNC Turning Process - An Overview
CNC Turning process is a simple method of shaping a metal or wood on a lathe. It is a machine tool that spins or turns a block of material to achieve rotational symmetry in a machine shop. Turning can be done manually or using a CNC machining. The computer numerically controls CNC machine. A typical CNC machining center is designed to remove material using a rotating cutter that moves laterally to a work piece mounted onto a table or fixture. In the CNC turning process, a piece of material is rotated on the lathe and a cutting tool is traversed along two axis of motion, transverse or longitudinal. The process is done in a machine shop. The cutting tool is used until the required depth and dimension is achieved. Turning can be on both sides, inside or outside as per the needs and specifications. The rotation occurs at the turning center that enables control of tool motion through computer programs that use numeric data. Parts that are too large to balance and cause difficulty in rotating around one center point, can be worked on a machining center featuring a U axis. The turning length is about 1000mm between centers and has a drive power and speed range up to 46kW and 4,000 revolution/minute respectively. CNC turning process cuts the metal into various different shapes ranging from plain surface, taper ends, contour, and filter to radius profiles and threaded surfaces. These cut and turned metal pieces are used to create shafts, rods, hubs, bushes, pulleys and much more. Many industries also use it for fabricating parts and materials that have circular cross section. The process applies well to the most rigid materials that can be controlled exclusively with the software program tooling. The process does reduce the cost of production but on the other end, it limits the design flexibility. CNC turning machines are said to deliver components at a faster production rate with optimum manufacturing accuracy. The automation of the CNC turning process allows reaching tight dimensional tolerances in every piece. Other advantages are high level of parts consistency or uniformity, achievement of optimum cycle times for all components and faster execution of larger volume. As machines have brought a revolution in the industrial world, new technologies provided by emachineshop, boost the use of metal products. George is a well-known author who writes on the topics related with free CAD software, cnc machine shop and waterjet cutting for the site www.emachineshop.com. [Photo]
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CNC Rotary Tables
1. Extreme Accuracy
A graduated dial and a vernier scale allow this rotary table to be positioned to a high degree of accuracy. The center of CNC milling equipment has hole that allows a morse taper center or fixture to be inserted. A tailstock is usually provided if the rotary table can be mounted from its end, so that the axis will be horizontal. The most common use of this CNC milling equipment is on it vertical axis that in this mode is on the same plane as the cutter when it is used on a milling machine.
2. Coaxial Design
If the CNC rotary table is mounted on a secondary table the work piece is adjusted in the center around the rotary tables axis, in this position the work piece is centered around the cutting tools axis; this make all three axis coaxial. Making a way for the secondary table to be offset in either the x or y plane so that the cutter is pitched at a distance from the work piece's center allowing a simultaneous operations on the work piece.
3. Specialized Or General?
There are literally hundreds of CNC milling equipments available on the market today with different specifications and different additional features. They come in all types of shapes and sizes. Some are designed for specific applications, while others are more of general purposes in nature. When looking for the right CNC rotary tables, try to talk to people who already using this kind of equipments from them you can learn how this things work. The good thing about talking to this people is that you will gain information not based on industrial propagandas but on experience and uses of there CNC milling equipments. You can also visit a shop in your area so that you will ly see on how CNC rotary tables work. You can eve try to use one CNC milling equipment to know how it feels. You can also attend CNC seminars to be able to gain professional views about his matters and also do not forget to check online information sites.
4. Setting Up Shop
When setting up your CNC rotary tables make sure that the platform is stable and your CNC milling machine secure. Setting up your CNC milling machines is a critical issue to early success, the less movement that occur the better. The right material to be used should also be thought about when using this kind of CNC milling machines. Determine the right thickness and sizes of your materials. Also look for proper fixtures for your CNC milling machines, for this will save time, money and frustration when using your CNC rotary tables.
Before going into production, make a plan to test the different variables you need to work with for a period of time. Getting familiar with your machine is also a critical issue for success. Try to make familiar with the different types of cut, type of materials to be cut, the table type, the depths of cut, the feed rates and the type and sizes of bits that you will be utilizing. Feel around the machine but not literally though for it may I injure you.
5. Satefy
Make sure to read your manuals and have a thorough understanding about the safety measures and the different features of your CNC milling machines. Have a good idea on how this things works. On what it can do to make your business prosper and also on how it can harm your employees.
Article Source: http://www.articlenorth.com
For more great cnc rotary table related articles and resources check out www.onlyrotary.com
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CNC Milling Machine Buying Tips
1. About CNC
- Computer Numerical Control (CNC) Milling is the most common form of CNC
- CNC mills can perform the functions of drilling and often turning
- CNC Milling machines are classified according to the number of axes that they possess
- Axes are labeled as x and y for horizontal movement, and z for vertical movement
- The evolution of CNC milling machines drastically changed the manufacturing industry
- Curves are as easy to cut as straight lines, complex 3-D structures are relatively easy to produce, and the number of machining steps that required human action is way down.
2. The Fabrication Process
With the use of CNC milling machine the fabrication process of the materials have been trimmed down to just a couple of steps. CNC Milling machines now days are driven directly from computer softwares crated by CAD software packages. With the use CNC Milling machines the assembly of parts can go from brief designs without any intermediate paper drawing works being required. In one sense, with the use of CNC milling machines industrials tasks are done must easier and much faster and the production cost of the company is also lessening out. CNC machines may be said to represent special industrial robot systems, as they are programmable to perform any kind of machining operation, within certain physical limits, like other robotic systems.
3. Buying Tips
Before buying a CNC milling machine it is a must that you should have knowledge about the CNC milling machines basic parts. A CNC milling machine is basically composed of a Safety shield that is usually a clear plastic cover that cover and protects the cutting area. The Tool bit, this part of the CNC milling machines is the one that do the cutting. Spindle Shaft, is the part that holds the tool bit. Spindle Motor, is the part of the CNC milling machine that drives the cutter. The Vertical Column, the part that holds the spindle and all of its part. The Cross Side, a moveable support where the work piece is being cut. The axis motors, which moves the cross side into different axis and the Controller box.
When purchasing your milling machine make sure to check that you have all of this part intact on your CNC milling machine, for if one of this parts is not there it will not surely work or will produce an undesirable end product. Also see to it to check out for safety features, never buy a CNC milling machine without an emergency stop button, this button automatically stops machining when it is pressed. Human, hardware or software errors could mean big losses if the CNC cannot be stopped quickly enough to correct the problem. Also check out the control panel part, it is advisable to buy one with a big control guide sticker so you can clearly see it.
Also check out the screws and tools with long overhangs and adapters, be more observant about cracks and breaks on this CNC milling tools. Make sure that the plastic shield that you are purchasing with your CNC milling machine is made up of high impact polycarbonate plastic. An insert break loose from a 35 mm diameter CNC milling cutter at a spindle speed of 45,000 rpm will be thrown out at a speed of 90 meters per second - equivalent to a bullet that is being shot out of a pistol!
Article Source: http://www.articlenorth.com
For more great cnc milling machine related articles and resources check out www.cnc-advisor.com
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About CNC Controllers
CNC controllers are devices that control machines and processes. They range in capability from simple point-to-point linear control to highly complex algorithms that involve multiple axes of control. CNC controllers can be used to control various types of machine shop equipment. These include horizontal mills, vertical mills, lathes and turning centers, grinders, electro discharge machines (EDM), welding machines, and inspection machines. The number of axes controlled by CNC controllers can range anywhere from one to five, with some CNC controllers configured to control greater than six axes. Mounting types for CNC controllers include board, stand alone, desktop, pendant, pedestal, and rack mount. Some units may have integral displays, touch screen displays, and keypads for control and programming.
Industrial communications options for CNC controllers include ARCNet, CANBus, ControlNET, Data Highway Plus, DeviceNet, Ethernet 10/100 Base-T, parallel, PROFIBUS, SERCOS, Universal Serial Bus (USB), serial (RS232, RS422, RS485), and web-enabled. Communications language choices include bitmap, conversational, DXF file, G/M codes, Hewlett Packard graphics language, and ladder logic. A bit map (often spelled "bitmap") defines a display space and the color for each pixel or "bit" in the display space. Conversational language is a higher level, easy to learn programming tool. It performs the same functions as the standard G-code commands. Drawing eXchange Format (DXF) file that was created as a standard to freely exchange 2 and 3 dimensional drawings between different CAD programs. It basically represents a shape as a wire frame mesh of x, y, z coordinates. G-code is the programming language for the Computer Numerically Controlled (CNC) machine tools that can be downloaded to the controller to operate the machine. M-code is the standard machine tool codes that are normally used to switch on the spindle, coolant or auxiliary devices. Hewlett Packard Graphical Language (HPGL) was originally created to send 2 dimensional drawing information to pen plotters, but has since become a good standard for the exchange of 2 dimensional drawing information between CAD programs. Ladder logic is a programming language used to program programmable logic controllers (PLC). This graphical language closely resembles electrical relay logic diagrams.
CNC controllers have several choices for operation. These include polar coordinate command, cutter compensation, linear and circular interpolation, stored pitch error, helical interpolation, canned cycles, rigid tapping, and auto-scaling. Polar coordinate command is a numerical control system in which all the coordinates are referred to a certain pole. The position is defined by the polar radius and polar angle. Cutter compensation is the distance you want the CNC control to offset for the tool radius away from the programmed path. Linear and circular interpolation is the programmed path of the machine, which appears to be straight or curved, but is actually a series of very small steps along that path. Machine precision can be remarkably improved through such features as stored pitch error compensation, which corrects for lead screw pitch error and other mechanical positioning errors. Helical interpolation is a technique used to make large diameter holes in workpieces. It allows for high metal removal rates with a minimum of tool wear. There are machine routines like drilling, deep drilling, reaming, tapping, boring, etc. that involve a series of machine operations but are specified by a single G-code with appropriate parameters. Rigid tapping is a CNC tapping feature where the tap is fed into the work piece at the precise rate needed for a perfect tapped hole. It also needs to retract at the same precise rate otherwise it will shave the hole and create an out of spec tapped hole. Auto scaling translates the parameters of the CNC program to fit the work piece.
Features common to CNC controllers include alarm and event monitoring, behind tape reader, diskette floppy storage, tape storage, zip disk storage, multi-program storage, self diagnostics, simultaneous control, tape reader, and teach mode.
http://www.cnc-academy.com/cnc-programming-articles/cnc-programming-articles.htm
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For all your CNC machining and plumbing needs
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CNC Programming Tips the Professional Way
The fairest and reasonable answer to those questions would basically when a part has been machined under the most optimized working conditions. Therefore the Programmer’s responsibility does not end after he or she finishes the program. We could say that the program at this stage is still very much in the development process, because most of the programming considerations were based on certain assumptions and there are a lot of external factors that may affect the outcome of the product.
Every Computer Numerical Control programmer should have an effort to be in the touch with the actual production. In the field of software development, Constant communication with your colleagues as well as actual machine operators of the CNC will help you to improve your own program. Because most of the time the CNC machine operators are a good source of constructive ideas, improvements and suggestions.
A good CNC programmer should talk, ask questions to them and most importantly listen to what they have to say. Programmers who never put their foot in the actual machining process and think they are always right are all on the wrong track. Exchanging ideas with CNC machine operators, asking questions and seeking answers is the only way to be fully aware of what is going on in the machine.
Whenever you start a Computer Numerical Control Program the first time it is important to check its Program Integrity. A new and unproved program is a potential source of problems. During Manual Programming in CNC, mistakes are more common than when the program is made in a CAM program.
A good way to look at a new program is through the machine operator’s perspective. Experienced Machine Operators take a direct approach when running a program for the first time. That means that they wont take any chances of mistakes with the actual running of a program therefore a good programmer must take note of any comments that the Machine operator will say about the program.
What does an experienced Machine Operator look for in a new part of a program? Most of the Machine operators would say that the first and most important thing to be checked on a Computer Numerical Control Program is its consistency. Therefore a machine operator looks at how a CNC programmer does its own programming, is the way you create your own algorithms the same as the other ones. Machine Operators take note with this kind of Information.
Upgrading your CNC Program
Whenever you upgrade your own program, it means that you are strengthening or enriching it, therefore making it better than it was before. Upgrading would be based on this standard, It is to decrease the production cost without compromising the quality of the part being manufactured or the safety of the Computer Numerical Control Machine Operator.
One of the Most Common forms of Program Optimization is doing some minor changes to the spindle as well as the feed rates of the machines. This process is called cycle time optimization, slightly increasing the spindle speed and feed rates of these machines will decrease the time it takes to finish the part.
And when we compare it to mass production, saving one second for each part in a batch of 3600 pieces would mean an hour saved. Efficiency in the rate of production is a very important aspect in Mass Production.
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Cnc Shop, Water Jet Cutting Machines, Granite Bridge Saw
CNC Machines technology is one of the new emerging technologies used in metal industry. The introduction of CNC (Computer Numerical Control) machines has made a great impact on the manufacturing industry. These are very useful as can help to cut curves as a straight line; Complex 3-D structure can be produce and thus reduced the human actions. This is one of the reasons so that CNC Shop are getting so popular and helpful. It gives more flexibility in holding the parts in manufacturing and to change the machine to produce different components.
CNC machine has the functions of milling, grinding, polishing and sculpting.
It is especially suitable for producing high grade basin board and other abnormal products
Made of stone, ceramic, glass and micro-crystal stone. The machine will automatically
finish the processing of any required profile by simple setting. The products are of high precision and good glossiness rate.
One more example of same type of tool is Water jet cutting Machines, which are capable of slicing into metal or materials with high velocity and pressure. It is often used for both fabrication and manufacture of parts for machinery and some other devices.
Water jets can be used to cut materials as diverse as fish sticks, 'gas station' sandwiches, and titanium. But still there are some materials that cannot be effectively cut with a water jet cutter like, tempered glass, which shatters when cut, regardless of the cutting technology used.
Water jet cutting technology is the most efficient, cost effective and fastest growing method to cut materials. Due to its versatility and ease of operation, fabricators are quickly realizing the vast potential of these machines. Water jets (or abrasivejets) can cut virtually any material in any shape with no heat distortion or mechanical stress usually caused by other methods.
Granite Bridge Saw are also getting very useful for industrial uses. Bridge Saws also include different varieties for the different purposes in Small laboratories or industries as Marble and granite bridge cutter, diamond saw machine into rails, electronic bridge shape sawing machine, Compactness and sturdiness etc.
Marble Services Co. has contracted with many corporations, businesses and residents to perform hundreds of restoration and refinishing projects, both large and small. Following the Northridge Earthquake we restored many damaged marble statues and stonework, in many cases masking any evidence of damage.
For more details please visit http://www.marbleservices.com/
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For more details please visit www.marbleservices.com/
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Aluminium Die Casting
Aluminium is the preference metal for making light weight parts of vehicles, aerospace, transport and many more industries. Casting of liquid aluminium alloys into metal moulds utilizing systems like gravity, low pressure and high pressure die casting is an economical way of making difficult shapes which need minimum machining.
The main die casting alloys are: zinc, aluminium, magnesium, copper, lead, and tin etc. Main advantages of aluminium die casting are:
• Lightweight
• Dimensional stability for complex shapes and thin walls
• High thermal and electrical conductivity
• It retains strength at high temperature
CNC Machines technology is one of the new emerging technologies used in metal industry. The introduction of Computer Numerical Control (CNC) machines has made a good impact on the manufacturing industries. These are very useful as can help to cut curves as a straight line; Complex 3-D structure can be produce and thus reduced the human actions. It gives more flexibility in holding the parts in manufacturing and to change the machine to produce different components.
With CNC Precision machining, all of this drilling can be done automatically instead of the manual process listed above. Machining has to be precise, and whether you use a CNC lathe or milling machine, you have to make sure the part is right. The computer takes a lot of the guesswork out of the machining of these parts. In fact, a CNC programmer can sometimes get bored watching the machine do all the work.
There are number of industries providing World class quality, manufacturing and services in Aluminum die casting and CNC Precision Machining.
Article Directory: http://www.articledashboard.com
Aluminium Die Casting and CNC Machining are getting very popular in most of the countries. For more details please visit our website www.bepsi.net.
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Computer Aided Manufacturing Applications
Computer Aided Manufacturing (CAM) refers to an automation process, which accurately converts product design and drawing or the object into a code format, readable by the machine to manufacture the product. Computer aided manufacturing complements the computer aided design (CAD) systems to offer a wide range of applications in different manufacturing fields. CAM evolved from the technology utilized in the Computer Numerical Control (CNC) machines that were used in the early 1950s. CNC involved the use of coded instructions on a punched paper tape and could control single manufacturing functions. CAM controlled computer systems, however, can control a whole set of manufacturing functions simultaneously.
CAM allows work instructions and procedures to be communicated directly to the manufacturing machines. A CAM system controls manufacturing operations performed by robotic milling machines, lathes, welding machines and other industrial tools. It moves the raw material to different machines within the system by allowing systematic completion of each step. Finished products can also be moved within the system to complete other manufacturing operations such as packaging, synthesizing and making final checks and changes.
Some of the major applications of the CAM system are glass working, woodturning, metalworking and spinning, and graphical optimization of the entire manufacturing procedure. Production of the solids of rotation, plane surfaces, and screw threads is done by applying CAM systems.
A CAM system allows the manufacturing of three-dimensional solids, using ornamental lathes with greater intricacy and detail. Products such as candlestick holders, table legs, bowls, baseball bats, crankshafts, and camshafts can be manufactured using the CAM system. CAM system can also be applied to the process of diamond turning to manufacture diamond tipped cutting materials. Aspheric optical elements made from glass, crystals, and other metals can also be produced using CAM systems.
Computer aided manufacturing can be applied to the fields of mechanical, electrical, industrial and aerospace engineering. Applications such as thermodynamics, fluid dynamics, solid mechanics, and kinematics can be controlled using CAM systems. Other applications such as electromagnetism, ergonomics, aerodynamics, and propulsion and material science may also use computer aided manufacturing.
Computer Aided Manufacturing provides detailed information on Applications of Computer Aided Manufacturing, Cam And Computer Aided Design, Computer Aided Design , Computer Aided Design Scanners and more. Computer Aided Manufacturing is affiliated with Computer Aided Design and Manufacturing
Article Source: http://EzineArticles.com/?expert=Kevin_Stith
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CNC Milling Machine Buying Tips
CNC stand for Computer Numerical Control, and refers specifically to the computer control of machine tools. The main purpose of CNC Milling Machines is to repeatedly manufacture complex parts in metal as well as other materials, using a specially coded program. This specially coded program that is used by CNC Milling machines is written in a notation called G-code. G-codes represent specific CNC Milling functions in alphanumeric format. CNC Milling was developed in the late 1940's and early 1950's by the MIT Servomechanism Laboratory.
1. About CNC
- Computer Numerical Control (CNC) Milling is the most common form of CNC - CNC mills can perform the functions of drilling and often turning - CNC Milling machines are classified according to the number of axes that they possess - Axes are labeled as x and y for horizontal movement, and z for vertical movement - The evolution of CNC milling machines drastically changed the manufacturing industry - Curves are as easy to cut as straight lines, complex 3-D structures are relatively easy to produce, and the number of machining steps that required human action is way down.
2. The Fabrication Process
With the use of CNC milling machine the fabrication process of the materials have been trimmed down to just a couple of steps. CNC Milling machines now days are driven directly from computer softwares crated by CAD software packages. With the use CNC Milling machines the assembly of parts can go from brief designs without any intermediate paper drawing works being required. In one sense, with the use of CNC milling machines industrials tasks are done must easier and much faster and the production cost of the company is also lessening out. CNC machines may be said to represent special industrial robot systems, as they are programmable to perform any kind of machining operation, within certain physical limits, like other robotic systems.
3. Buying Tips
Before buying a CNC milling machine it is a must that you should have knowledge about the CNC milling machines basic parts. A CNC milling machine is basically composed of a Safety shield that is usually a clear plastic cover that cover and protects the cutting area. The Tool bit, this part of the CNC milling machines is the one that do the cutting. Spindle Shaft, is the part that holds the tool bit. Spindle Motor, is the part of the CNC milling machine that drives the cutter. The Vertical Column, the part that holds the spindle and all of its part. The Cross Side, a moveable support where the work piece is being cut. The axis motors, which moves the cross side into different axis and the Controller box.
When purchasing your milling machine make sure to check that you have all of this part intact on your CNC milling machine, for if one of this parts is not there it will not surely work or will produce an undesirable end product. Also see to it to check out for safety features, never buy a CNC milling machine without an emergency stop button, this button automatically stops machining when it is pressed. Human, hardware or software errors could mean big losses if the CNC cannot be stopped quickly enough to correct the problem. Also check out the control panel part, it is advisable to buy one with a big control guide sticker so you can clearly see it.
Also check out the screws and tools with long overhangs and adapters, be more observant about cracks and breaks on this CNC milling tools. Make sure that the plastic shield that you are purchasing with your CNC milling machine is made up of high impact polycarbonate plastic. An insert break loose from a 35 mm diameter CNC milling cutter at a spindle speed of 45,000 rpm will be thrown out at a speed of 90 meters per second - equivalent to a bullet that is being shot out of a pistol!
For more great cnc milling machine related articles and resources check out http://www.cnc-advisor.com
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Cycle Time Reduction Principles for CNC Machining Equipment
Cycle time is defined to be the time that happens from the time a task or series of tasks is initiated to the time a task is completed. Example, the cycle time is the time a shipping order is printed to the time it is loaded on the truck and the system is updated. An alternate definition would be is the time it takes to load, run, and unload on workpiece.
Cycle time of a machine can be simply measured by timing how long it takes from pressing the button to start the cycle for the first workpiece to the pressing the next button for the next workpiece.
Production quantities in an industry dictate that the more workpieces you run, the more important it is to achieve the goal of lowering the cycle time.
Everything and anything that happens in a Computer Numerical Control (CNC) machining equipment can be divided into four categories:
1.) On-line, productive tasks:
These are the actual machining operations that occur during a CNC cycle. These are the milling, drilling, tapping, reaming, and any other machining operation that in some way furthers the completion of the workpiece. To minimize the cycle time in these areas, there are two ways in which this can be achieved. One would be through careful process planning.
The process engineer must select an appropriate machine tool, cutting tools, fixturing, and machining order in a way that it matches the number of workpieces to be machined that will be based on the production quantity. The cycle time will be a reflection of the processes being used to machine workpieces.
If in the many times that your company’s processes have already been developed and implemented before you begin your cycle time reduction program, then your second alternative is to optimize cutting operations for this would involve properly selecting cutting tool materials, feeds, and speeds to machine workpieces as efficiently as possible with the current process.
2.) On-line, non-productive tasks:
These are tasks that occur during the machining cycle that do not actually further the completion of the workpiece. The first thing Computer Numerical Control people often target for improvement is wasted program execution time. These are the things like rapid movements, tool changes, M-code execution and spindle acceleration/deceleration. Reducing program execution time in this area is usually easy.
It often takes nothing more than carefully monitoring the production run for a few workpieces to find those times when the program can be modified to eliminate noticeable pauses during the cycle. Although keep in mind that the worker for these machines must not overlook other processes for they may be so concerned with minimizing program execution that they overlook other operations, resulting in severe wastes of cycle time.
3.) Off-line, non-productive tasks:
These are the tasks performed in the machining cycle that do nothing to further the completion of the workpiece. Since these types of tasks are done while the machine is producing workpieces, they do not actually add to the cycle time. It is possible to free the operator of the machines of performing off-line productive tasks if they have little, or nothing to do during lengthy machine cycles.
4.) Off-line, productive tasks:
These are the tasks done away by the CNC machine, while the machine is producing workpieces, which would further the completion of the workpiece. This is extremely helpful during lengthy CNC cycles, tasks in this category can reduce the time it takes to complete the production run dramatically, which would effectively reduce cycle time.
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How CNC Helps Companies
The advent of Computers lessened the need for human intervention in almost all aspects of our daily lives. This is especially true in the industrial sector now that production is virtually automated.
Precision and accuracy
Computer numerical control has been able to help companies in terms of precision. With the need for more complex designs and more complex operations, human workers could not cope with the required precision that comes with advancement. CNC machines were able to alter that idea by allowing increased precision and lesser error ratios with regards to production.
Another important improvement that CNC has brought with it is the increased accuracy. The dimensions of components have to be very accurate. And since an increase in production speed also increases the error ratio, CNC has helped lower that ratio by the increased level of automation and the error detection capabilities that computers have.
Speed
In the industrial sector, speed is of the essence. With CNC technology, the normal production capacity has been increased exponentially. This means that effective and accurate production methods have been developed. Mass production requires more scrutiny for errors and mistakes. However, anomalies can also be corrected. The programming structures of CNC machines can be altered in a fast way. This means that mistakes do not have as serious an impact as they had before CNC was improved to this level.
Machine versatility
CNC machines have become very versatile with regards to the tools that they use. They can easily be assigned to different tasks and thus can be very productive. Tools and networks can be switched without compromising the speed of the production. Aside from this, one machine can do more than one task at a time. This exceeds the normal human capacities as it allows more tasks to be accomplished at a faster rate than before.
Furthermore, when one machine tool breaks down, it can easily be pulled off the grid to prevent it from affecting the whole production cycle. It can then be replaced or repaired on the spot.
Lesser human intervention
Since component production is a very tedious and repetitive operation, human error skyrockets as time passes. This is due to fatigue and other factors. Furthermore, the ability of a person degrades due to psychological and emotional factors. This means that if a person works on the same job for a certain amount of time, the person may eventually get bored or tired or both. This increases the possibility for the human to commit an error and thus causes a drop in the efficiency rating of that person. A machine, however, does not get tired or bored. A machine does not have any concern at all.
Therefore, a machine increases efficiency ratings by speeding up production and eliminating or reducing factors that threaten efficiency. In this case, one must simply program the machine to start a cycle. Furthermore, humans have to be fed, paid, and rested. Machines only have to be rested when failures occur to often and they do not need to be paid or fed.
This brings us to the conclusion that companies will be able to save a lot in the long run. While investing in CNC machines is not cheap, maintenance will only cost a fraction of what will be paid to manual laborers.
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