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Thread: Metal z coupler question
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05-09-2015, 11:02 AM #1
- Join Date
- Jun 2014
- Posts
- 29
Metal z coupler question
Is the threaded rod supposed to be sitting on top of the motor shaft or is there speed to be a gap? I have a gap on mine but I can see the z axis changing from the coupler springing up and down.
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05-09-2015, 01:43 PM #2
Mine are set up without a gap.
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05-09-2015, 01:51 PM #3
Mine sit on the motor for the reason you mentioned.
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05-09-2015, 04:40 PM #4
I put a ball bearing (an airgun BB actually) between the motor shaft and the threaded rod.
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05-09-2015, 07:28 PM #5
- Join Date
- Jun 2014
- Posts
- 29
Thanks for the input. I'll get mine changed.
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05-10-2015, 08:36 AM #6
- Join Date
- Jul 2014
- Location
- Eastern Colorado
- Posts
- 536
I leave a small gap in mine. The weight of the X axis should be enough to compress the metal couplers enough to take out most bounce. If you have a bent Z rod, you want a small gap there to let the z rod and coupler flex so it doesn't affect the X axis as much. If the rod were in contact with the motor shaft, it may not flex as easily, and you'd get some artifacts in your prints.
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05-10-2015, 09:33 AM #7
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05-10-2015, 01:45 PM #8
Ball bearing allows the rotational and torsional compliance with an out of true z threaded rod (they all are out a little) without introducing Z height concerns.
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