The delrin nut seems to turn pretty easily on the screw until maybe 5 turns in, where it becomes pretty hard to crank by hand.
How tight should it be?
Should I be able to turn it by hand without putting much effort?
Thanks
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As a rule of thumb that I adopted when building my cnc.... If I could not turn the lead screw with my thumb, index and middle finger (on my 5/16" nut and while it was fully assembled with the motor attached) then I would fine tune that axis more. I found that if I couln't trun it that way my 269 oz. stepper that was attached "in-line" with the lead screw would stall. At least that is what I experienced.
Justin!!!
UHMW = Ultra High Molecular Weight Polyethylene - "poor man's teflon". Cruise around on www.mscdirect.com - they have UHMW, Acetal, HDPE - all kinds of plastics and they sell small quantities.
EDIT - Try www.mcmaster.com instead - they have a much better selection for raw materials.
EDIT - Or try this site - it's a bit slow, but there is a large variety of plastics - www.professionalplastics.com
Scott
Last edited by mxtras; 12-06-2006 at 12:10 AM. Reason: Added another link
Consistency is a good thing....unless you're consistently an idiot.
Now I see why its a poor mans teflon. It liks to freeze up in cold weather causing my steppers to stall. What to do, What to do. How bout rack and pinion?