Originally Posted by
Mac.CNC
Hi!
I tend to disagree with the ball screw recommendation, because of the experience.
There's nothing wrong with the original Momus design, using properly tensioned cevlar reinvorced belts on the x and y - the beauty is that there can't be any backlash.
The 2nd X stepper motor is a must to make this work, which isn't in the original manual, unfortunately...
With that mod, the long version that I've been running for a few years now has no problems holding 0.001" precision on the X and Y.
The machine I've built back then should be pretty worn out by now, but it isn't - and I've done nothing special to it, except for keeping the rails clean - using WD-40.
So far, several hundred board foot of poplar boards were profiled into smaller parts without any adjustments and it still holds up to cut engravings into jewelry without any issues..
Long story short, stick to the belts - it really works.
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Mac