Re: [CAD_CAM_EDM_DRO] how important is backlash in a simple home setup ??

Just run another nut up on the rod with a lockwasher or belleville washer in between it and the existing one. Then afix a small bracket or sleeve over the two to keep them from rotating away from one another. A strip of shimstock wrapped around the two with a hose clamp to retain. Its simple but reliable. Adjust all the backlash out then a slight preload should be sufficient.

Ron

Johan <wykj@...> wrote:



Hello again everyone, I'd like to know what sort of backlash can be
tolerated without serious mishaps ?? I'm finalising the drivers for a
cnc router I built, now before I spend too much cash I'd like to get
an honest opinion on how much backlash can I tolerate if fir instance
I'd like to do small plaque engraving, PCB drilling etc.

I didn't have access to any expensive anti-backlash nuts etc.(main
objective is to do it as cheaply as possible, if I like the hobby I'd
spend more bucks)......... so I just used a single nut on some
threaded rod, plus the homemade couplings between the steppers and the
threaded-rod I used also has quite a lot of play in them, so as I
measured I'd have about 0.8 mm error, I suppose that's a lot, but as I
measured it's only out by that much whenever I change direction on a
axis, once it's moving in a single direction the error becomes much
smaller, now if I use software backlash compensation does that add 0.8
mm for every step or only when I change direction ??









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