Originally Posted by cadmonkey  Correction - I used each method on 2 different axes - I used oversized balls on Y to only use one nut and maintain max travel. I used double nuts on X. Both have some backlash but it is a small and consistent amount that is easily compensated for by my control software. (I think the .0025 was an early measurement, I thought I got it down to .001 or less, I'd have to check my .ini file for EMC to be sure).
And yes, my double nut setup didn't work like I intended as I don't have a strong enough stepper to preload the 2nd nut as much as it needs to take up the slop and still turn - I loose steps - I didn't do a spring separation setup, I compressed 2 nuts together and haven't been able to tune it 'just right'. |
CadMonkey,
I think perhaps I am misunderstanding your setup. On your X axis, didn't you have two ballnuts facing each other, both threaded into the "Preload Block"? Doesn't this put them at a fixed distance apart? Where does the preload come from? What pushes the two nuts apart?
Also, you didn't do either method (larger balls or doublenut) on the Z axis correct? How did that work for you?
And what kind of backlash were you getting on the Y axis after switching to larger balls?
AND...(last question for this post...I promise) is there a limit to the amount of backlash that Mach3 can correct for?
Thanks!
-Caleb105-