Forced syncing of dual Z steppers before homing?
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In a dual Z corexy, is it reasonable to first let both steppers to go all the way down to forced stop before doing the Z homing?
My thinking is that this will insure that both screws are at the same relative height in case one of them lost a few steps (e.g. when power down).
Will this damage the steppers or the screws?
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That is the technique used by Prusa I3 printers to sync the Z screws. You can reduce motor current while jogging Z to the bottom of the axis to minimize the chance of damage and unpleasant noise.
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If you are using a Duet WiFi or Diet Ethernet then you can use stall detection to stop the motors when they reach the bottom (or top). Alternatively, drive the two Z motors from separate stepper motor outputs, then use the Z probe to level them - see https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors.
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@dc42, for a dual motor (in series), single driver, will it detect stop at the bottom only when both motor are stopped?
I looked for the dual driver configuration but couldn't figure it out from the RepRap configurator, it seems to support only a single Z driver (?). https://configurator.reprapfirmware.org/Motors
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@zapta said in Forced syncing of dual Z steppers before homing?:
@dc42, for a dual motor (in series), single driver, will it detect stop at the bottom only when both motor are stopped?
I assumed that you were already useing separate drivers for the two Z motors.
I looked for the dual driver configuration but couldn't figure it out from the RepRap configurator, it seems to support only a single Z driver (?). https://configurator.reprapfirmware.org/Motors
There are lots of features that the online configurator doesn't cover. To see how to configure separate drivers for your Z motors, look up the M584 command in the GCodes wiki page.
