Z drop on board reset
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Hello all,
I am having an issue with my printer at work, duet 2 wifi, cartesian printer with single drives on x and y, duel drive on z. 1000x1000x1000 build area. Pellet extruder. The z's are using the ZA and ZB ports on the board, I am planning on moving the B port to E0, waiting on more connectors. In the mean time, I have been leveling the z gantry manually and I realized that one of the things I was struggling with was when the board resets, the z motors let the gantry lower on the side with the most weight. Obviously, this is making it harder to level the already horrible to level bed. my question is does anyone have any ideas on how to prevent these drops? It is getting tedious to relevel the gantry every time I need to update the config.g.
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Z motors with brakes is one complicated option.
Another is to use a lead screw with a shallower angle of attack so that rotational resistance is greater.
Even so, there is a chance you may need to re-level anyway due to the way the stepper motors snap to the nearest full step which may be in different directions. Linking the motors with a belt can help, but even so, using independent lead screw leveling is usually required.
https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors
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@Tpmoses said in Z drop on board reset:
I was struggling with was when the board resets, the z motors let the gantry lower on the side..
I made a similar transition from a dual stepper single driver to a dual stepper dual driver Z configuration and it works well.
With the single driver approach, I had a macro that lowered the bed using a reduced stepper current. That causes both sides to get to their mechanical bottom which I used a standard position for stating the Z homing process.
