08-03-2004, 10:11 PM
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 | Gold Member | | Join Date: Sep 2003 Location: Malaysia/Australia/NZ/USA Age: 62
Posts: 1,124
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Originally Posted by wjbzone With a 200 step/rev motor on a 5tpi screw, (0.200 pitch), each step moves the nut 0.2/200 = 0.001 inch/step. ( a 12 tpi will give 0.0004"/step and a 16 is about 0.0003).
The 0.001" resolution good for me. I think deflection in my ways and my machine alignment can be more of a problem. |
Right-oo! Then factor in Full, Half, Quarter Step or smaller microsteps from your controller/driver to get to the rest of the resolution.
[Just as you mentioned - ball screw vs the other choices and the deviation in machining the bits all contribute too]
BTW wbjzone/Bill's right - the deflection in the system and other things like surface unevenness (not flat) of your table all push you further away from "perfection." Just know how close you think you need to be and then make it a bit tighter. Should be alright mate!  - Jim
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Experience is the BEST Teacher. Is that why it usually arrives in a shower of sparks, flash of light, loud bang, a cloud of smoke, AND -- a BILL to pay? You usually get it -- just after you need it. |
and i'll pay for the 2nd version which belongs to me.... 
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