- posted
16 years ago

How can I calculate the reduction ration of a ball screw?

For example, let's say I have a DC motor spinning at 3000RPM, with a maximum

of 2000oz-in torque. If I couple the motor to a ballscrew that is 200mm (8")

long and has 6mm (0.236") screw lead, it's intuitive that if 3000RPM is

mantained, then the screw will travel throughout its extension in 0.66

seconds.

Let me just double check my math... 3000RPM = 50 revolutions per second. The

ball screw needs close to 33 revolutions (200mm/6mm per rev.) to travel the

200mm, therefore 33/50 = 0.66s. Therefore 3000RPM is roughly equivalent to

303mm/s.

What about torque?

Cheers

Padu