Force generated by acme thread
Not CNC related. I have a machine that has 3 stationary acme rods, 1 1/2-4. polished 316 stainless steel. There are 3 Delrin AF ( teflon filled acetal ) nuts that rotate in tandem via #25 chain, attached to an air motor with a stall torque of 28.5 lb/ft. I am able to raise the turret of the machine with a torque wrench set at 1.5 lb/ft. Not sure of the accuracy of the import wrench. What is the best way to calculate this? Figure the force for one assembly then divide by 3 is what I came up with. But for the life of me, I cannot find the coefficient of the delrin AF against stainless steel. I found as low as 0.04 for a particular bronze, but not the plastic. This is not all super critical, as I am just verifying that the air motor that was purchased was sized correctly.
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Re: Force generated by acme thread
Looking at this catalog, they don't list a plastic nut for your screw size, but based on a 1-1/4" screw, it takes about 0.12 in-lbs to lift 1 lb.
Page 51. http://www.nookindustries.com/Conten...ew-Catalog.pdf
You need to know how much weight that you're lifting, then divide by 3. I'd probably add another 20-40% on top of that.
Gerry
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Re: Force generated by acme thread
Kinda what I was thinking. I found other calculators on the web, did not look at nook, though. Thanks Ger, you are always spo on.Originally Posted by ger21
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