Re: gearmotors,encoders

>
> I'm not an ME (just a dumb chemist) but occasionally can run a

calculator.

> assuming 1.1 for effective dia. of the 1.25" lead screw and only

800 oz-in of applied torque I get 0.06 degrees or 1 count in

> 5700.
> If your drive exceeds the 800 oz-torque on accel. then all

bets are off.

>
> Dave
>
> ps
> The deflection is linear with torque so at least you don't have

a power function working against you. ;-)

Dave,

Hi, keeping things in perspective, 800 in/oz at 1250 RPM is darn
close to 1HP. This power can move a lot of heavy things around in a
great hurry. 1HP will accelerate a 1500 lb load at 1G to 250 IPM,
neglecting transmission efficiency. That means a reaction force of
3/4 tons. I'm not sure how good that would be on a leadscrew, yet it
would deflect torsionally only 0.06 degrees. A 1,000 line encoder
resolution (1 count) would be 0.09 degrees.

Mariss