[Mike9966]

Thanks for the info.
I'm disappointed in the load capability, I was hoping for double that for an arm to de-turtle us as it were. lol

I'll have to revisit the design to see what we can do.

Say, check my math if you wouldn't mind.

If I want to move the nut such that it travels 12 inches in 5 sec or less, that converts to 3.2 revs/sec (with a lead of .625) which is 38.4 rpm.

If one looks at the FP motor torque curve at .2Nm (max power) the speed is about 700 rad/sec which is about 6700 rpm. Thus I would need to reduce that by about 174:1. This would give a perfect world torque of about 305 Lb-inches

I (based on wanting to lift 300 lbs, and yes, I know Ill have to change that) need 300/(.625*6.28)=about 76 Lb-in
Throw in about 80% for the lead screw and about 75% for the reducer and we get a 183Lb-in available to drive a 76 Lb in load.

Some how it just doesn't seem like I'd have that much extra oomph out of a FP motor.

The big question is how am I going to get a 30 inch arm up with only 15 inches of travel and be able to flip our 150 lb robot. Hmmmmm

Thanks for your thoughts everyone.

Mike