Steppers not holding torque between moves

Software / Firmware Jackpot Board / FluidNC
1

I’m having an issue with stepper drivers not holding torque between moves.

The steppers move just fine on command, but holding does not seem to be enabled as I can easily push the gantry around after a machine move.

I’m using TMC2225 drivers on a Tinybee board running FluidNC. I’m not sure if this is related to the TMC2225 driver or my FluidNC configuration.

Any ideas where I should start looking to troubleshoot this?

Thanks in advance.

2

Some drivers have a setting that disables them or at least lowers the current after a certain amount of time so they stay cooler. I don’t know whether it’s your drivers or the bee, but that would be my guess. :slight_smile:

3

I figured it out. The idle_ms is was set to 0. It should have been set to 255.

It’s holding now.

http://wiki.fluidnc.com/en/config/axes

  • idle_ms:
    • Type: Integer
    • Range: 0-255
    • Default: 250
    • Details: A value of 255 will keep the motors enabled at all times (preferred for most projects). Any value between 0-254 will cause the disable pin to activate this many milliseconds after the last step. Note: Motors can be manually disabled at any time with the $MD command.
2 Likes
4

See, that’s what I meant and you found it! Neato! :slight_smile: