Stepper Motor Speed does not match MaxVel
- richcolvin
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25 Sep 2025 19:04 #335424
by richcolvin
Stepper Motor Speed does not match MaxVel was created by richcolvin
I am finding that
When I run LinuxCNC based on this configuration, the value for the parameter, hm2_yi92.0.stepgen.02.maxvel = 1.
Regardless, the stepper motor does NOT run at 1 rev / sec.
Attached are the HAL, INI, and include files for
Help would be GREATLY appreciated!
Thank you and kind regards,
Rich
- the stepper motors for the two spindles work as expected, however
- the stepper motors for the axes (B, U, V, X, &, & Z) run at a VERY slow speed.
- Servo Thread
- Max Interval = 1,013,089nS
- Max Jitter = 13,089nS
- Base Thread
- Max Interval = 46,407nS
- Max Jitter = 24,074nS
- Step Length = 2.5µS
- Step Space = 2.5µS
- Direction Setup = 5µS
- Direction Hold = 5µS
When I run LinuxCNC based on this configuration, the value for the parameter, hm2_yi92.0.stepgen.02.maxvel = 1.
Regardless, the stepper motor does NOT run at 1 rev / sec.
Attached are the HAL, INI, and include files for
- Spindle0 (Spindle1 is the same)
- Axis X (axes Y, Z, B, U, & V are the same)
Help would be GREATLY appreciated!
Thank you and kind regards,
Rich
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- PCW
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25 Sep 2025 19:30 - 25 Sep 2025 21:53 #335425
by PCW
Replied by PCW on topic Stepper Motor Speed does not match MaxVel
The velocity units for linear axis are in inches per second, not revolutions per second
If the linear velocity is not correct, its likely the the step scale does not match the hardware
(hardware meaning the ball screw pitch, step drive microstep ratio, any intermediate gear/belt reductions etc.)
The velocity units for rotary axis are in degrees per second.
Note that latency will have no real affect on scaling unless its
so bad that you get stalling (which would be obvious)
If the linear velocity is not correct, its likely the the step scale does not match the hardware
(hardware meaning the ball screw pitch, step drive microstep ratio, any intermediate gear/belt reductions etc.)
The velocity units for rotary axis are in degrees per second.
Note that latency will have no real affect on scaling unless its
so bad that you get stalling (which would be obvious)
Last edit: 25 Sep 2025 21:53 by PCW.
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