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Now we can calculate the maximum speed for a axis by taking the steps needed per mm (266,6 on our machine) and divide it by the maximum steps per second we can do: 1600 [st/s] / 266,6 [st/mm] ~ 6mm/s with maximum torque.
 
Now we can calculate the maximum speed for a axis by taking the steps needed per mm (266,6 on our machine) and divide it by the maximum steps per second we can do: 1600 [st/s] / 266,6 [st/mm] ~ 6mm/s with maximum torque.
 
We can of course run much quicker (for example for G0 commands) but then the mill should not be in action!
 
We can of course run much quicker (for example for G0 commands) but then the mill should not be in action!
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This aspect of a stepper motor means also: lower microstep setting allows higher speed and vice versa.

Version vom 4. Januar 2015, 10:18 Uhr

This page descibes technical aspects of the CNC machine in more detail.

Stepper Torque

The torque of a stepper driver is not linear over the number of revolutions per second. It is nearly linear in the beginning but drops down at a specific point for each motor until it reaches zero. In our current setup we use Sanyo Denki 103h7126-0740 Motors, which are linear until about 1000 to 2000 steps/second. We are using 8 Microsteps, so the normal 200 steps per revolution (1.8 Degree step size) must be multiplied by 8, which gives 1600 steps per revolution. Now we can calculate the maximum speed for a axis by taking the steps needed per mm (266,6 on our machine) and divide it by the maximum steps per second we can do: 1600 [st/s] / 266,6 [st/mm] ~ 6mm/s with maximum torque. We can of course run much quicker (for example for G0 commands) but then the mill should not be in action! This aspect of a stepper motor means also: lower microstep setting allows higher speed and vice versa.