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Before buying a cnc router or router cnc(computer numerical control) should define very well what you will use the machine for and according to that you must choose the right size, the tips or drills to buy, the engine power, software and more.
The first thing to consider when buying a cnc router are your needs, so do not buy an oversized machine that costs a lot of money and not to use the most or buy a machine and undersized their requirements are greater for example with respect to the cutting area, if you intend to make kitchen cabinets then you need a machine with the cutting area of at least 1 m * 0.6 m, because if you buy a very small machine will be very difficult to cut the doors of the furniture and then cost of expanding the size of cut is very expensive or impossible in some unexpected situations. Also if you work with small craft do not need a machine with the capacity described above.
What if reality is that many times buying a machine with a 1 * 0.5 m instead of 0.5 * 0.5 meters is not much difference in price, also the have a larger machine allows you to produce several small pieces, so you can make several parts in one process without having to change each time the wood sheet.
Also you need to know the number of axes you need, usually comes with 3-axis, but if you need to make special round parts should consider a machine with 4 or 5 axes.
It's good to budget how much you are willing to spend because a cnc router machine may be costing between 3,000 U.S. dollars to 150.00, if your budget is limited should consider buying a refurbished machine or used machine.
There are differences in the engines that can buy such a stepper motor is much cheaper than a servo, the difference is that the servo motor you can paralyze the process and return to work from the point where it stayed, however if for some reason you have to stop the process with the stepper motor, you will need to make everything from scratch. Likewise displacement screws come in different models and the price varies considerably from one model to another as are the standards and THK.
You also must consider the router to use for example when working with hardwood will have to use an engine with four or more hp, so it must take into account the hours of use, it is advisable to use engines with four or more hours of continuous work so it won't burn out.
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Cnc software
There are many software for cnc router, cad or cam either generally all companies offer trial program, so it is suggested to test various systems and see which feels more comfortable, you should take into account that the more complex the more options will have this program.
Cad system types are:
Cad 2D, these systems are linear ie only work with X and Y axes, so do not let you work with depth, can make circles, squares, ovals, etc.
2.5D CAD, has the same functions described above except that lets you work with the depths, that is also working with the Z axis
3D Cad, lets you work figures in 360 degrees, meaning that you can make a cube, a ball (half of it), etc.
Cnc programs or CAM systems, allows you to translate all his creations made cnc cad language, which is the cnc machines understand.
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