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Registered Member #2008
Joined: Tue Mar 03 2009, 05:11AM
Location: USA, Frederick, MD
Posts: 118
I am building the CNC machine. The math that I have done, gave me a force that would oppose the motion of a gantry.
If I know the force the motor would have to overcome, how would I know the torque of the motor required? J=F*d, I don't know d.
There is a lead screw mechanism involved and it is going to give the motor some mechanical advantage over the load. 1 revolution of the motor = 0.00254m of motion of the gantry part. How do I know the torque it will take? Thank you.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I think you just multiply the force (in newtons) by that 0.00254, then by 2*pi because that's one revolution in radians, and that'll give you the required torque in newton-metres.
You can't calculate the needed torque (aquratelly) if you don't have the screw assembly. There is a big difference in torque requirement if you use a ball screw compated to delrin nut (for example).
I would advise you to first build the axis, place the load and measure the needed force to rotate the lead screw.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Steppers rotate in a circular pattern of jumps and after stepping, they bounce a bit then settle. You dont get smooth inertia.
The torque you need is in 2 parts Static and dynamic. Static is breakaway (just to jerk it to a start) and dynamic is after it is moving.
With a spring scale and a string around the shaft you can get both.
Miight tbe what happens when single phase induction motors trys to replace 3 phase on lathes. Torque pulsations at 2xline frequency impose a vibration on the machine that needs to be dealt with.
Registered Member #150
Joined: Sun Feb 12 2006, 09:43AM
Location:
Posts: 11
Might also be better to us servo motors depending on the size of CNC you are building. I have build a 3 axis CNC mill and working on another. What are you trying to build or convert?
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stepper motor torque to overcome force
