1 Topic by ryan-mm85 (edited by ryan-mm85 2014-03-17 01:31:14)

  • ryan-mm85
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  • Registered: 2013-10-16
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Topic: z-screw knocking/sloppy SD3

my z-screw/ axis is sloppy and knocks at certain points. looks like its wobbly.
whats the best way to fix this issue.

I don't want to try and make something that doesn't work 100% of the time.
anyone know how to fix this?

this is for a solidoodle 3.
and no I have not dropped it or anything like that.

2 Reply by satman49

  • satman49
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  • From: virginia
  • Registered: 2012-12-28
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Re: z-screw knocking/sloppy SD3

Sounds like it is bent. Mine does that too,just haven't gotten around to replacing it yet.

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

3 Reply by grob (edited by grob 2014-03-17 05:10:04)

  • grob
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Re: z-screw knocking/sloppy SD3

The rivets in the back of mine were loose, and the whole table rocked up and down - check that it's not that. It's easy to take the table out, drill out the 6 rivets one by one and replace with bolts (do them up tight, and use nyloc nuts or spring washers so they stay that way).

If the thread is bent/wobbly itself, there are a few solutions, most seem to replace the rod with a metric one (M3 or M5) and a coupler to the Z motor, which makes it less stiff (and thus wobbles the table less). It's a bit involved, but well documented. Start here: http://www.soliforum.com/topic/2154

If you're game to try a ballscrew or something else way over-the-top, it's been done: http://www.soliforum.com/topic/2998/sd3 … all-screw/

If you've got the time, a video of the wobble would probably glean a more accurate diagnosis... Good luck!

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