1 Topic by accusedmonk

  • accusedmonk
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  • Registered: 2013-10-22
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Topic: Backlash with Non-Captive stepper motors

I'm considering options for the Z-axis on my printer build.  I've seen quite a few Non-Captive steppers in sizes I could use that have the threaded rod included.  It really won't be a big issue, unless I intend to use Z-lift, but I'm curious if anyone has had experience with these motors and the kind of backlash I will experience with them.

I'm going to be mounting it directly in the middle of the bed, and all four corners of the bed will be guided by the vslot frame and mini v-wheels.  I shouldn't have any wobble at all, so as long as I have the up and down motions in check I can order this motor.

This is the one I'm considering:
http://www.omc-stepperonline.com/nema-2 … p-153.html

My main goal is to avoid using 2 steppers on the z axis.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.

2 Reply by grob

  • grob
  • grob
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Re: Backlash with Non-Captive stepper motors

Looks like a trap thread and a plain brass/bronze nut in the motor - this will have backlash designed in to prevent binding, but as long as you load it in one direction (e.g. with the mass of the bed) then it won't change thread faces and you probably won't see much presenting.

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi

3 Reply by accusedmonk

  • accusedmonk
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Re: Backlash with Non-Captive stepper motors

I figured it would have some play, there doesn't seem to be much out there about them.

The bed will be 1/2 inch glass framed with aluminum extrusion around 12 to 14 inches square, so having it loaded won't be an issue!

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.