Oops, missed the 2 start part on the screw (I'm such a dummy).
So yup 166.8 lbs X .57 eff = 95 lbs thrust force.
You really need the motor torque curves to know exactly where you are and how the motor will respond to the higher voltage. My experience has been that you don't gain much but it's been years since I did any serious work with steppers (I'm a servo motor kind of guy).
At 40 IPM with a 5TPI screw the motor is only running a only 200 RPM (666 sps) so you should be well down into the torque curve and more than 20% power should be available. You may be able to jog as fast as 70-80 IPM.
Bob
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