Quote:
Originally Posted by steamer
It's pretty ease to figure out screw drive RPM. Just measure one inch of the thread and count the number of threads in that inch. That way your know how many turns of the the screw it takes to move one inch. If the screw has 32 tpi. and the gear drive is 32 it's going to take one minute to move that 1 inch. If you want to know yours count the threads on your screw, time how long it take to travel the inch and you'll know the RPM
Say the thread pitch is 20 and it takes 15 sec. to move the inch.
Take 1 min.= 60 sec Div. by 15sec.=4x20tpi =80RPM
So it's going to take 80RPM to move the 20tpi.screw 1in. in 15 sec.
Rob
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Thanks for the info.
Well, only one of the 3 screw drives actually still works, sort of (the other two just slip the gears on the shaft) and I was able to measure it like you suggested. It was 32TPI and it took 4 seconds to move one inch so that is ((60/4) x 32) = 480 rpm. The screws drives are definitely not slow. Looks like I was way out on even considering one of the gear motors I have lying around. I was just going to use the existing screwdrives but all 3 no longer work ... and I haven't even used it yet other than to drive 5 feet on the garage floor. It's a project piece for sure.