- October 10, 2015 at 8:06 am #3421
The allthread included in the bundle had the coupler nut, 3 regular nuts, and a spring. I know what the coupler is for, but how are the others used, and what is the spring for?
KarlOctober 10, 2015 at 6:39 pm #3452
The spring is used to reduce backlash. There is an image (cutaway from a model) showing how to install it on the bottom of the home page. Look for z-nut lock.
CurtOctober 11, 2015 at 2:33 am #3466
Thanks, Curt. The picture makes it clear how to install, though I don’t know if I could install mine – I had to file and use a c-clamp to press the coupler nut into the z-nut lock. Maybe I could calibrate my printer a bit better and reprint if necessary. How does the spring and second nut reduce backlash?
KarlOctober 11, 2015 at 3:03 pm #3486
In theory, the space between the rod thread and the nut thread causes backlash.
If you hold the rod and nut in your hands you can pull the rod in and out of the nut, ever so slightly, this is backlash!
The spring would hold the thread faces (Rod and Nut) together, to close this small gap, and therefore remove the backlash.
Greg.October 11, 2015 at 5:01 pm #3487
Did you print with ABS or PLA? I struggled with how tight things were with PLA and ABS shrinks more. My coupler and nut were not tight with PLA and I ended up using some CA to hold it in place.
CurtOctober 11, 2015 at 5:06 pm #3489
Greg, thanks for the explanation.
Curt, I printed in PLA. I had to file a little bit to get the coupler nut in. I’m okay with the z axis right now. I’m going to work on getting it running and cutting and in the meantime I’ll run some calibration prints and see if I can get it a little less tight. The only reason to redo the z nut lock is to be able to get the backlash spring in.October 12, 2015 at 7:38 am #3496
I’m not sure the backlash spring even does anything major I would say you are fine without it. I just used it in case there was an issue.
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