When you are looking for a CNC Router there are many things to take into consideration before you buy it. There are many manufacturers who have what you need and you can get a good bargain if you do some research ahead of time.
Here are some things to think about as you are deciding what type of machine you want to buy:
§ Do some research — before you start looking for a CNC Router it is a good idea to do research on all the different types of routers available. If you already have used one, then you know what they can do. § Decide what you need — from the research you do you will know the types of projects you want to do and what different machines will do. Its important to think about what you want to do with this CNC Router so you get a CNC Router that is specific to your needs. § Decide on your budget — if you have to stick within a budget be clear about how much you will spend so that you can be sure to get a router with the amount of features you need for the price you can afford. § Buy what you need — you will find a lot of CNC routers that have bells and whistles on them that you will probably never use. There are also machines that don’t have enough for you, so a rule of thumb is to buy what you need with a little upgrade to make sure you get the performance you want. Reliability — sometimes its more important to get a reliable machine than the most expensive machine on the market. ITs important to think about the load that you want your CNC Router to hold as this will also determine a few things before your buy your Router. § Durability — check the materials in the main parts of your router to make sure that they can make intricate cuts or carvings and that it can withstand a lot of use. This will really depend on the materials it is made from. § Know the Software — you will have some sort of software, usually CAD to understand so that you will know how to make the machine function properly. Sometimes vendors will offer training on this and if so, it’s a good idea to take it. § Create a space — sometimes people go out to purchase a machine and they find that it is too big for the space they have. This is an important component of buying a CNC router so make sure your router will fit in the space you have and that the floor you have it on can withstand the weight, if the machine is a large one.
Beyond these tips it is important to shop around. If you are willing to do a little footwork you can go where you may be able to try out the CNC Routing . Although some people may have used machines it would be better to buy it new so you know its status. Sometimes a distributer can just get in the way and a manufacturer could make one that is just right for you.
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A CNC Router has several different parts that make up its total machine. It is important to know about these components so that you can make sure each is working properly. This is especially interesting information when you are thinking about building your own Router.
The most important parts and components of a small CNC Router are as follows:
1. Worktable — this is where you will sit the material so that it can be cut. You will use a clamp to hold the material down. 2. Router — the router is the part of the machine that uses a high speed to turn the cutting tool. 3. Cutting Tool — this is the tool that cuts the material that you lay on the table. 4.Collet — this part is soley used to hole your cutting tool in the exact located needed on the router. 5. Dust Extraction Outlet — this is where you take the dust out after it has accumulated in the machine. 6.Guard — you will always want this as it will protect whoever is operating the CNC Router. It is important to keep this down when the machine is in operation. 7. Control Panel — you can use the controls to use the router either manually or automatically. 8. Stop Button — this is the button that will stop the machine in an emergency. 9. Door Handles — this holds the guard into place and will not allow the router to move unless the guard is down.
These are the components for a small table machine but when you want something bigger as you might for a large machine shop or manufacturing industry, the router will be more sophisticated. These machines will need the computer component which is the CNC Controller and you will need the CAD software to run it. There are many websites that will tell you more about how to build your own and will have a listing of all the parts necessary.
As you explore the parts and components of a CNC Router you will find that they are made from a variety of materials. As an example, when you are choosing a machine to make, you will find some components in wood, others in aluminum and others in steel. What components you choose will depend on your budget and their availability.
There are almost too many stores to choose from when it comes to buying parts and components online for your CNC Router. There is some very good information that can be found here when you are looking for advice on the components and parts.
The parts that you choose will also depend on what you want to do with it and the types of projects you are going to use it for. The space that you have for the router will also determine the size.
The final consideration is whether or not you want a fully animated machine or not. If you want it fully automated it is obvious that it will need different parts than if you want to use the router by hand. Prior to purchase its best to take your time and really research what you will need for your very own CNC Router.
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CAD (Computer-aided design) Geometry authoring tool that involves software and sometimes special-purpose hardware. Current packages range from 2D vector based drafting systems to 3D solid and surface modellers.
CAM (Computer-aided manufacturing) Considered as an NC programming tool wherein 3D models of components generated in CAD software are used to generate CNC code to drive numerical controlled machine tools
Computer Numberical Control (computer numerical control) Refers specifically to a computer “controller” that reads G-code instructions and drives the machine tool.
CAD/CAM part programming The computer calculation and creation of a toolpath based on part geometry information created in CAD.
Canned cycle A predetermined machining sequence used to simplify programming.
Data Information processed as the basis for calculations.
Database Computer storage that holds data and is searchable
Detail Drawing A drawing of a part giving a complete and exact description of its form, dimensions, and construction
Dimension The desired measurement of a part
Documentation A CAD process in which a part design is converted to a computer file or hard copy for reference and storage purposes.
Drawing Exchange Format DXF. A standard storage format for personal computer-based CAD/CAM platforms
Driver That portion of the electronic package that receives the stepping sequence from the translator and provides the switching of the windings in the stepper motor.
G-Coding Common name for the programming language that controls NC and CNC machine tools
Geometric Modeling A modeling process in which a designer creates lines and text that represents the shape of a desired part. Geometric modeling is the first step in CAD.
Geometry The measurement, properties, and relationships of the lines and points of an object that make up its shape
M Code A code used to signal an action from a miscellaneous group of commands. M codes change cutting tools, turn on or turn off the coolant, spindle, or work piece clamps, etc.
Machine Control Data Manufacturing instructions defined in CAM and enacted on a CNC machine.
Machine Control Unit A small, powerful computer that controls and operates a CNC machine
Machine Tool Powered mechanical device, typically used to fabricate metal components of machines by machining
Machining The selective removal of metal or material
Numerical Control The use of computers and special program instructions to execute the sequence of machining operations to make a part.
Part Program A series of numerical instructions used by a CNC machine to perform the necessary sequence of operations to machine a specific work piece.
Personal Computer PC. A computer designed for an individual user and commercial software. Desktops, laptops, and notebook computers are PCs.
Plotter A large printer used to print blueprints. These output devices support vector graphics, unlike dot matrix and laser printers.
Post Processor A software link in the CAD/CAM chain that communicates instructions from CAM to a CNC machine
Preliminary Blueprint A design representing the rough dimensions of a specific part
Primitives or Primitive Basic shapes such as cubes, spheres, cylinders, blocks, and cones that are combined in solid modeling to create a model of a part.
Prototype The original test model of a part
Raster Image A form of graphics in which closely spaced rows of dots form an image on a computer screen. Also known as bit-mapped graphics.
Ramping The process of controlling the pulse frequency to accelerate or decelerate a stepper motor. Ramping increases the ability to drive larger loads at greater speeds by slowing the first series of pulses allowing the motor to overcome inertial loads and reduces overshooting by slowing the motor down more gradually than an unramped motor.
Scanner A computer device that converts hard copy drawings into digital form
Software The coded instructions, formulas, and operations that structure the actions of a computer
Solid Modeling A type of geometric modeling based on solids in which all visible surfaces of a part are shown. In addition, solid modeling describes interior volume, mass, and weight.
Sub-Program Acting as a part programming shortcut, a part program sequence that is called on as needed. Also called a subroutine. Surface Modeling A type of geometric modeling based on geometry only, in which all visible surfaces of a part are shown regardless of volume definition.
Step Angle The angular increment the motor shaft will turn each time the windings (coils) are energized. The angle is specified in degrees. For a 200 step per revolution motor the step angle will be 1.8 degrees.
Step per revolution The total number of steps to rotate the motor shaft 360 degrees. For CNC, 200 or 400 steps per revolution are usually used.
Stepper motor A device that translates electrical pulses into precise mechanical movement. The output shaft may deliver rotary or linear motion.
Title Block A portion of a blueprint that contains information such as the company name, part name, part number, designer, scale, and material.
Tolerance A blueprint specification indicating an unwanted but acceptable deviation from a given dimension
Toolpath The series of coordinate positions that determine the movement of a tool during a machining operation.
Translator An electronic device that converts pulses into the correct switching sequence, which will operate the motor one step for each pulse received.
Unipolar A bifilar wound motor. The current flows only in one direction through each winding. Normally there are two winding per bobbin and eight bobbins per motor. Usually is a 5, 6 or eight wire motor. One or more common leads are used per winding. Has less torque than a bipolar stepper motor but is simpler to drive. Bipolar stepper motor- just two windings. The electronic controls reverse the current alternately between the coils. This motor has more torque but requires more electronic controls.
Vector Graphics A form of graphics that uses geometric formulas to represent images. Vector graphic images are more easily manipulated than raster graphics when dealing with CNC.
Wire Frame Modeling A type of geometric modeling in which the edges of a part are represented by solid lines
Working Drawing A drawing of a part providing data for manufacturing
X-Axis An axis that is left or right. All movement left of a zero point is minus (-X), all movement right of the zero point is plus (+X).
Y-axis An axis that is at right angles to the X-axis and intersect the zero point of the X-axis. All movement further away from the zero point is plus (+Y). All movement closer than the zero point is minus (-Y).
Z-axis An axis that is vertically perpendicular to the X-Y zero point. All movement above the zero point is positive (+Z) while all movement below the zero point is (-Z).
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Process of CAM CAM is a process just like the rest of the steps in CNC. You need to do certain things before it spits out the tool paths and then the G-Code. These things you need to define change with the type of CAM you are using and the CAM program you are using. They are all similar, but a bit different.
Here are the CAM Steps: Define Material Define Stock Size Define Coordinates Define Tool Define Feeds and Speeds Simulate Machining Post Process
Define Material You will need to define your material before you begin your machining. For example, if you are machining wax, your feeds and speeds you define later can be faster. If you are machining steel, you will need to slow things down. Most times the type or composition of the material will not need to be defined in the CAM program, but you will need to be very aware of it.
Define Stock Size Next, you will need to let the CAM software program know what the size is of material stock you will be using.You are usually going to define a “box†or “cylinder†you will begin with. The machine needs to know where the stock starts and ends so it can make sure to remove all the material it needs to.
Define Coordinates How will the machine know what is 0,0,0 in the coordinate scheme? You need to tell it. You will pick a corner of the stock box and let the machine know that is exactly 0,0,0. That is also where you will need to “zero out†your machine at. This is the beginning point for the Machining operations. It is also usually the ending point of the program as well.
So what is the best spot to pick for 0,0,0? There isn’t one. It depends on your machine and how the axis’ are laid out in your brain. For me, I like to pick the “Highest Z Point†and the “South West Corner†because that is where zero is in my brain. I have also set all my machines up that way.
Define Tool Defining the tool is an easy process. If you were going to use a tool, would you like to know what it is and how you are supposed to use it? You need to let the machine know what tool it is holding and what size that tool is. The machine needs to know the diameter, length, offset, and how far the tool sticks out from the spindle so it does not crash. If the tool is a plasma cutter, the CAM program will need to know the width of the torch cut. It can then compensate for it.
Define Feeds and Speeds Next, you need to let the program know how fast you want the machine to move and how much material you want to take off with each pass. This is where defining your material above comes in. I will not get into the calculations here, but each material and tool combination has an optimal Feedrate.
You will also be adjusting the spindle speed in this step as well. All these pieces of the puzzle interrelate with one another. Imagine the spindle going slow, with a fast feed rate. You will probably damage your machine. Imagine the spindle going fast, with the feed rate extremely slow. You will have low productivity and probably prematurely wear your tools. All this adds up to the fact you will have to use your brain and gain some real life experience.
Simulate Machining This is my favorite step. Here you run your program on your virtual piece of stock and watch the material being machined away. How cool is that!You get to see what you did before you try it out on your High Cost CNC equipment. As I said before, this is like proof reading what you did while programming.I have found many problems and fixed them before I got out to my shop.
Tool Paths When you are done simulating the machining, you will see tool paths. Tool Paths are one of the outcomes of our CAM process. Tool paths are literally that, the path that the tool will follow while machining. CAM Software shows us these paths so we can follow what is going to happen. The logic of the CAM Software determines where these paths will be and in what order they will happen. The tool paths will then be converted into G-Code in the next step.
What are tool paths and how do you create them? Tool paths are the paths the tool will take around and through the piece of material to create the part. Tool paths show up as a very thin wireframe movement paths in the CAM process. This is to show you where the machine will be traveling. You want this so you can see if there will be any interference issues while machining.
Once the cnc tool paths are generated, you can general watch an animation of the machining action. You can “virtually†watch the machine work and machine the material. This is a very helpful feature of modern CAM programs. I don’t know how many times I have found a problem in the simulation before I ever made it to the shop.
Post Process Finally, you post process the program you created. This is where the G-Code is created. You pick the appropriate post processor for your CNC Machine and press a button. The CAM program takes all your inputs and spits out a G-Code program that you can load into your control software and away you go.
Post processing is literally a one-click process for most CAM programs. The only pitfall as I said was that you must pick the right post processor that is matched to your machines set up. Most CAM programs come with dozens of post processors and one is going to likely fit your setup.
Machining Simulators Most Computer Aided Machining programs come with a machining simulator. Some are basic and weak. Others are outstanding. There are a few stand-alone simulators on the market that you can run your G-Code through.
CNC Simulators: Cncsimulator.com Mach
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CNC Intro Questions, Questions and a few more Questions What is CNC? What do the letters “C-N-C†stand for? How can it help me? Why would I want to learn it? Where do I start? Do I need special software? If so, which one? Do I need a machine? If so, how much?
We will get to these questions shortly and cover each of them. What has probably led you here today are questions?You have problems you want to solve and you think Computer Numerical Control can help? Guess what, that is exactly how I began the CNC journey as well!
So, where am I at today? Today I have a few machines that I work with. Each have their own nuances, software, capabilities and functions. The point of it is that they are all CNC. They all follow the same basic process. That process is pure gold if you know it. You can move from machine to machine and know what is going on. That is what I want to teach you.
CNC Machines I own today: CNC Plasma Cutter – My first machine.A good project if you want to build your own CNC machine. Born out of necessity. She is a little rough around the edges, but a solid friend. Vinyl Cutter – This is a unique type of CNC Machine. This machine uses a small knife to cut out vinyl in any shape or size. Think “sticker machine.â€Â You know the stickers on the back of every jacked up truck you have ever seen. You know, “P_ss on Chevy, Ford, Dodge, etc. So a vinyl cutter is actually a “Redneck sticker-making machine.â€Â I actually bought it to cut sandblast resist, which is a whole different story. CNC Mill Machine – My 3rd CNC machine. This one I purchased. It is actually a CNC Bridgeport Clone if you want to get technical. It is funny how addictive this hobby is. I bought this machine to make the parts for a CNC Wood Router. “Wait, you bought one CNC Machine to build another CNC Machine?â€Â The answer is…. YES! I love this hobby. CNC Wood Router – My fourth machine. My father likes woodworking and I like steel working.This is kind of a transition machine for me. I have found woodworking with CNC to be really cool. It has gotten me into 3D milling on the cheap. Think of the cost of 3D milling a brick of aluminum or a block of wood into a shape. That’s right. No Brainer. Wood is free in comparison.Â
CNC Hobby Growth Story CNC as a DIY Hobby has really seen a growth spurt over the last ten years. I think I stepped into it about two years after it started cooking in the late 90s. When I jumped in there were a few CNC Groups going already and about three different CNC Plasma Tables available at the hobby level. I don’t know where the other machine types were at the time because I came in through the plasma path. I would guess they were further behind as CNC Plasma Cutters was one of the first areas of CNC to take off in the Hobby arena. Most of the quick growth I would say is because of the Internet. Groups formed, ideas were shared. Feedback was given.People started making “machining chips†and didn’t look back over their shoulders.The Internet brought technology into garages across the country. When I built my $4000 CNC Plasma Table a hobbyist class machine was around $10,000 and a commercial machine was $100,000 to as high as you wanted to go.
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If your shop isn’t full of a CNC Router, then most experts will say your shop isn’t complete. This is a versatile tool that can make things a lot easier for the person using it.
CNC actually stands for computer numerical control and it is a machine that works through the use of a computer that reads a particular code called a G-Code to make certain parts. This computer does the work by cutting away materials that the code tells it to cut. The machine has certain parameters that it works within and these are determined by a software program.
Before CNC machines, there were NC machines which stands for numerically controlled and the problem with these were that you could not change their parameters that they worked within. As the popularity of these machines grew the CNC Information came into being but used the old NC styled hardware. Eventually the programs became more sophisticated and used floppy disks instead of punched tape to transfer the codes to the machine until it eventually evolved to what is in place today.
CNC machines were responsible for changing the manufacturing industry. These machines could produce curves, straight lines or complex structures in 3-D without much human interaction. In fact, the machining steps that were required for a human to do were reduced to just a few steps.
As these machines continued to improve and automation began to be instituted in the processes for manufacturing, the CNC machine again improved and decreased the error frequency while improving quality. This automation helped the operator’s production overall. With the CNC automation it brought more flexibility to the way parts were held in the process of manufacturing and it reduced the time it took to change the machine in order to produce different types of components.
Today, there are a variety of uses for the DIY CNC machines and they are controlled through computer files that were created through CAM software packages. This enabled any part of the assembly process to go from design to manufacturing without a drafting plan created on paper.
CNC Machines also are something like a robot system because they can be programmed to do any kind of machine operation that has been programmed into them. They can also run 24 hours a day. Another nice feature is that they can be programmed to call the human operator if it detects a problem in any part of the process.
Through the use of the software programming the DIY CNC machine can cut curves, drill holes, tap, repeat the processes in a series –as an example a series of holes spaced so many spaces apart and it can support logical commands. There are many different types of CNC machines including routers, wood routers, lathe machines, mill machines, plasma cutters and more. You have several options if you want one from buying one new to making one yourself; there are many plans on the Internet to show you how to build your own.
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A machine tool that shapes metal and other types of solid materials is called a milling machine. A CNC milling machine does this automatically once a computer sets up the specifications for the machine, it uses a rotating cutter to work like a drill to cut the material.
There is a difference between a drill and a milling machine however. A milling machine will use a cutter that rotates around a spindle axis and the table by which the piece of work is attached. A drill only moves along an axis and can only drill in one direction. A milling machine can move sideways and in and out like a drill.
The CNC milling machine can be controlled evenly by what is put into the computer. Miling Machines can actually work in different ways as some milling machines the table moves around the cutter. CNC milling machines are digitally automated but other milling machines can be mechanically automated or operated manually.
A CNC Mill machine makes the operator’s work easier because it can do a number of operations like panning, rebating, drilling, routing and more. Often a cutting fluid has to be used at the site of the cut because it needs to keep the metal cool and the cut lubricated; also it is used to move the sluice out of the way.
In CNC Mill you will have a block of material that will be cut through by a rotating tool attached to the machine. You can actually move the piece in three dimensions all together so that you get the cut and shape that you want.
An operator can produce many different shapes with a CNC milling machine. For instance, if you have a 2D shape with an intricate pattern you can program the machine to do this pattern and repeat it as needed. The machine will also do 3D shapes, do different types of punches and even use a laser (usually a CNC Plasma Cutter).
Most metals and hard plastics are the best materials to use with a CNC milling machine because they can withstand the rigors of how the machine cuts. The pressure of the process doesn’t seem to be very good for softer materials as they can’t stand up to the pressure.
The CNC Mill machine is best used when you need a short run of materials to be produced. This process also needs only a software program to do the tooling and some type of jig to hold the work down while it is being cut. The machine is programmed using G-Codes for more precision.
Today, CNC milling machines are being produced that can do a variety of things. As an example, Datron Dynamics sells a CNC milling machine that does all of the milling needs but also does industrial engraving. This machine can engrave on most metals including Aluminum, graphite and stainless steel, but it can also engrave on ceramics and plastics.
The CNC Milling machine is a versatile machine and it can create many different parts while saving the company and the operator time and money.
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Many people say that a CNC Router is the best tool they have in their shop. This machine is very versatile and what it will do is cut down the time it takes to prepare the tast and cut the tast.
CNC Routers are machines that work in different directions. They can work in these directions simultaneously to develop patterns and shapes that the operator would take a long time to do by hand. The CNC Router moves along an axis to cut front to back, left to right or up and down.
One of the things that you will have to know as an operator of this machine is basic CAD software because this is what it uses to create the work. It is flexible enough that you can create the program you want at your own PC or through using the computer on the machine.
What you do with the CAD Software is to create files that you can put into the computer to show the Router the exact moves you want it to make. This allows you do pretty much whatever you want with it.
How A CNC Routing Works The CNC Router is very easy to run once you have the software in place. All you have to do is take the material you are using and place it on the table where you have the machine. You hold it in place and then allow the router to do the work, following the specifications you put into the computer.
You don’t have to worry about getting dust in your lungs because there is a dust hood on the machine that collects any debris or dust that comes off the material so that the air is free of any materials that may be harmful to the individual.
There are certain motors that are around to help keep the system on its axes and make sure the cuts are made in all directions. The drive system is important to the machine because the better is it the higher the quality you will have in your routing. The CNC router bits are actually controlled by a spindle and these come in several different shapes and sizes like you would find if you were using a power tool with drill bits.
It is important to note that whenever you are operating any machine you have to think about safety first and this is true of using a CNC Router . Although the machine comes with guards that can stop your hands from getting hurt while feeding materials, you should also use common sense when operating the machine. There is a system of stop buttons on various parts of the machine as well. However, you should make sure just as an added protection to wear gloves and sound blocking materials to avoid accidents.
The CNC Router is economical too because once you program it you don’t have to watch over it. Instead, you can go do other work or take a break while it does the work for you. It also opens up the chance to do projects that used to require a team of people to do.
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CNC Control Definition Here is my definition of cnc controlling and how I think about it. Controlling is using a computer to direct a machines’ functions and motion. The control phase of CNC is closely associated with the Machining phase. Why? You are using a computer to “control†the machining process. However, there are a few different pieces to controlling. Here we go again.Let’s break it down into a number of parts and simplify a bit.
CNC Control Software CNC Control Software is one of the fundamental things you will need to do CNC. The control software is what interprets the G-Code line by line and sends off commands to your machine controller.
Probably the standard in the hobby market is Mach. There are different versions: Mach1, Mach2 and Mach3. Mach is created by a company called Artsoft and has an excellent reputation in the marketplace. The software is easy to use and very powerful. The company also provides great service and is always working on the next generation of product. I have used a couple other control software packages as well like CNC Pro, TurboCNC and Master. They seem a bit outdated compared to Mach, but serve their purpose and work well.
List of CNC Control Software Mach 3 TurboCNC KCAM4 CNC Pro
Control Software Prices: CNC Controller prices vary all over the map. There are some that are free and some that are Thousands of dollars. If you are a hobbiest, expect to pay somewhere between free and $200. If you are running production equipment, expect to pay thousands of dollars. CNC Control software is essential, you need to make the monitary commitment.
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A CNC lathe is a machine that can spins material to do a variety of operations like sanding, drilling, cutting or sanding. Usually a lathe is used for more intricate cuts and Today, they replace the older multispindle lathes because they are easier to set up and operate.
A CNC Lathe will use carbide tooling and is designed using a CAM process which creates a file that can be uploaded to the machine at a later time. The reason these are so popular is because you can set the machine once to do several pieces and it will continue to do them until you have programmed it to stop.
Each CNC lathe has a computer control that allows the machine to be controlled electronically, and this program can be modified to do a variety of things. When an operator runs a CNC Turning they have to have a lot of skill to understand the programs and how the programs to do the work.
 You can work with wood when you use a CNC wood lathe or various metals depending on the project you are doing. The wood lathe can be used for wood but also for brass and Aluminum. There are also metalworking CNC lathes or milling machines that cut metal. You can do tapered work with these, drill holes, and create screw threads and more with these lathes.
Some CNC lathes are portable and others are stationary. In many shops for people who do woodwork for a hobby you would find a lathe because it is capable of making a lot of different designs and intricate cuts for things like stair railings, trellis’ or table legs.
The point of using a CNC lathe is to make a piece of material that is symmetrical and beautiful. This is done by placing the material in a machine and allowing that piece to be spun until it reaches the specification that was programmed into the computer. The cutting tools then move around it on the Z and X axis to cut away the material that isn’t needed to make the piece.
The process that the CNC Lathe does is called turning and it can do a variety of shapes when it goes through the full process. Many machines are used to create a plain surface to make contour shapes, to taper the ends of some pieces and it makes threaded surfaces. Sometimes people really want to make some creative metal shaps and you can do this and turn as much metal as you would like. In some industries they use a CNC lathe to fabricate parts that may have a cross section that is to move in a circular motion.
Any material can be used as long as it will hold up during the turning process while the software program is continuing its revolutions.
CNC lathes are best used when you want to turn out several pieces of the same size and shape and where you don’t want a lot of decoration. Like all machines, you have limits to what the machine can do, but this machine will still do a lot of nice pieces.
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