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What are “steps per turn”?

Dear Dan,
Recently I am working on the Delta Robots. I look your forward and inverse Kinematics of the delta robots and it help me a lot.
In your application of forward and inverse kinematics there is a term “Steps per Turn” and this term in controlling the resolution.
What do you mean by this term ?
I am implementing this kinematics in MATLAB. How I can implement this “Steps per Turn” in my code or how I can calculate the resolution in my case.
Thanks
Regards,
Zeeshan
I use three NEMA17 stepper motors to control movement of my robot.  Hobby servos have 256 positions in 180 degrees.  My steppers have 3200 steps per turn. I calculate resolution as distance tip moves when servo makes one step.  Better would be to calculate all steps at all positions and find max/min but this is javascript and it would probably kill your browser.  I have some code in the open source project that calculates the exact shape of the envelope.  It could easily be expanded to calculate the min/max step (which might not be the same size everywhere in the envelope).