My Z axis is hitting a vertical mechanical limit roughly 8mm short of triggering the limit switch. Attempting to home causes a loud cogging noise as the motor hits that limit. Placing a piece of wood between the z axis bottom plate and the limit switch allows homing.
What did I likely do wrong in the z axis assembly and what is the simplest way to fix that?
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Hi John,
It's possible that the Z-axis ACME nut block or leadscrew might be too high or not seated fully in the coupler. That’s why it’s hitting a mechanical limit before reaching the switch. Try lowering the nut block or checking the leadscrew position. Also make sure the limit switch is mounted correctly.
If the issue continues, reach out to our technical support team at https://ooznest.co.uk/help/
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RTFM! But please update the bag labelling, there are lock collars (for Z-Axis) and clamping collars (for the other two axis. It is only "obvious" when you go back.
Having unmounted the Z-axis assembly the issue was (incorrectly) using clamping collars instead of lock collars. The hex bolts in the collars on the lead screw hit the Z-Axis Plate as it gets towards either ends of the z-axis travel. The heads protrude enough to collide with the plate and stall the stepper motor.
I was able to avoid rebuilding everything by grinding about 1.5mm off the head diameters of regular m3x8 countersunk screws to allow the collar to rotate properly so the Z-Axis Plate could then hit the end stop/limit switch.
BUT: The pan head m3x8 bolts pre-fitted in the X-Y axis lock collars are not the correct bolts/screws for the collars. The unthreaded side of the collar is countersunk. The supplied bolts might have a tendency to work loose due to limited surface contact for friction, 2 of my Y-Axis collars were loose.
Hi John,
Thank you for the detailed feedback. We really appreciate you taking the time to troubleshoot and share your findings.
At this stage, to ensure everything is working optimally and safely, we’d recommend getting in touch with our technical support team so we can assist you directly: https://ooznest.co.uk/help
Thanks again for the feedback and your persistence; we’re here to help get you running perfectly.
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