Sir,
Your system accuracy depends on a number of things:
1) Gear rack accuracy around .005"/foot, could be less for more $$
2) Long axis ways straightness - you determine this
3) Cross axis ways straightness, "
4) perpendicularity of X to Y axes, "
5) Z axis perpendicularity to X-Y plane, "
6) Lost motion in each axis bearings to ways
In business, we used rack and pinion for many reasons, practicality, cost, accuracy, longevity, and customer acceptance. You will find MOST commercial machines use R & P.
Regards,
Jack C. |