CNC-Fräse/Technical: Unterschied zwischen den Versionen
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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. | 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 | In our current setup we use Sanyo Denki 103h7126-0740 Motors, which are linear until about 1000 to 2000 pulses/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) | Now we can calculate the maximum speed for a axis by taking the maximum pulses/second and divide it by the steps needed per mm (266,6 on our machine): | ||
We | <math>2000 pulses/s * 8 pulses/step / 266 steps/mm = 60 mm/s = 3600 mm/min</math> | ||
We need the factor 8 here because of the microstepping. | |||
This aspect of a stepper motor means also: lower microstep setting allows higher speed and vice versa. | This aspect of a stepper motor means also: lower microstep setting allows higher speed and vice versa. | ||
Version vom 8. Januar 2015, 18:56 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 pulses/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 maximum pulses/second and divide it by the steps needed per mm (266,6 on our machine): We need the factor 8 here because of the microstepping.
This aspect of a stepper motor means also: lower microstep setting allows higher speed and vice versa.
