Z-axis homing consistency

[nethack]

My Morgan seems to have 2 different positions that the z-axis homes to. Sometimes it is at exactly the right height. Other times it’s a couple mm too low (plastic doesn’t stick to platform). Have you seen this behavior or know how I could fix it?

Thanks,

don

[Quentin Harley]

You are using the hall effect sensors, right?

I can do a redesign of the sensor holder to make it slide past in stead of approaching it head-on. It could be that you have some magnetic interference close to the sensor… are there any motor wires passing close by the sensor?

[nethack]

Yes, I’m using the hall effect sensors. There doesn’t appear to be any motor wires nearby. The firmware that senses the endstops is interrupt-driven, not polling, correct? I’m not sure that a slide-past would improve things.

don

[Quentin Harley]

During homing it changes to give priority to the end-stop. It should never be out by more than a couple of milliseconds.

I do not have those issues on my machines, so i can only assume some hardware problem.

I will do a post when I redesign the z end-stop this weekend.

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