Re: Formula? for determing torque of motors and leadscrews.

<snip>

op's psosted before I added the motor bits

> doing the math, it seems that a 740 into a 10TIP leadscrew would
> deliver a theoretical 2,905 lbs.
>
> (2 * PI * 10 * 740 ) / 16 = 2,905
> 10 is tpi
> 740 is oz-in of motor
>
>
> 2905 * 90% = 2,615 delivered pounds for ball screws
> 2905 * 60% = 1,743 delivered pounds for ACME high eff
> 2905 * 30% = 871 delivered pounds for ACME low eff

To use a motor that delives 2905 on the screw is one thing, but to
get 2905 transmission power it another.

3,238 for a ball screw motor
4,448 for a 60% screw
9,685 for a 30% screw.

I did a quick check and found that using the deliverd force went way
down as did the watts, but that is delivered, not supplied. Supplied
would be using he same motor on each style and therefore the same
watts. The motor mentioned was 440-oz-in that would not change, but
delivered force would. by increasing the supplied force to get
similar delivered forecs would require upping the motor power.

now do the watts on those motors.

Dave