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Reply by brtech

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Posted on CNC machine needs

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brtech

1068 posts in 3836 days


#1 posted 02-06-2017 10:38 PM

People have done that, although they used steppers and not servos. It doesn’t work very well. Too much backlash and other issues.

Electrical is maybe $650-750 to $1000 or so. Four steppers, a Gecko 540, a power supply, computer and cables. Then you have software.

The mechanics really is a couple K$ to get the accuracy and repeatability needed. Lots of folks have tried to do it cheaper. You can, but the result is a toy and not a tool. You really need a ball screw for Z. For X and Y, you either need a ball screw or a rack and pinion, depending on the range you need. On the ball screws, you need a decent coupler. You need some heft in the carriages and the gantry, which typically means some form of 8020 extrusions or something like that.


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