<![CDATA[SoliForum - 3D Printing Community — Figured out why my Z axis jumped so much]]> 2015-02-12T22:26:19Z PunBB https://www.soliforum.com/topic/9778/figured-out-why-my-z-axis-jumped-so-much/ <![CDATA[Re: Figured out why my Z axis jumped so much]]> So I stopped printing long enough to look into this a little bit.  Here's some pictures.  The screw is a 8mm (don't really know the pitch.  I'm assuming TR8*8).  The nut that attaches to the bed is nothing fancy.   Just a nut.  Also, with the bed at Z0, there is almost 13mm clearance.
ht tp://i.imgur.com/nyBLYcal.jpg
ht tp://i.imgur.com/yAyWU3Cl.jpg

I wonder if this would be an easy bolt-on fix.  I'll measure the screw pattern when the next print is finished.
robotdigg       /product/18/Anti-backlash-Nut-for-Tr8*8-Leadscrew

Sorry about potato shots and can't post links.

]]> https://www.soliforum.com/user/7130/ 2015-02-12T22:26:19Z https://www.soliforum.com/post/84964/#p84964 <![CDATA[Re: Figured out why my Z axis jumped so much]]> Anyone know the thread and size of the lead screw?

]]> https://www.soliforum.com/user/7130/ 2015-02-12T03:20:01Z https://www.soliforum.com/post/84831/#p84831 <![CDATA[Re: Figured out why my Z axis jumped so much]]> I am going to have to look closely at mine but would it be possible to print something to support the rod? My only thoughts would be that youd lose z build area as I can see the lower endstop at the bottom. Can anyone confirm if we could anchor it with little to no loss in z-axis?

]]> https://www.soliforum.com/user/9377/ 2015-02-11T18:25:14Z https://www.soliforum.com/post/84737/#p84737 <![CDATA[Re: Figured out why my Z axis jumped so much]]> Glad to hear it helped.

@thatdecade - The backlash spring sounds like a nice tweak but I'd imagine the fact that the bottom of the axis is completely free floating in air would make a bigger difference than the nut. That long wobbling rod is basically an amplifier for any vibration that comes from the motor. Still really surprised that it's not secured somehow.

]]> https://www.soliforum.com/user/9449/ 2015-02-10T07:13:55Z https://www.soliforum.com/post/84378/#p84378 <![CDATA[Re: Figured out why my Z axis jumped so much]]> Tightening by rotating those 2 pin holes solved my thumping issue.

Thanks!

]]> https://www.soliforum.com/user/9484/ 2015-02-09T23:47:19Z https://www.soliforum.com/post/84321/#p84321 <![CDATA[Re: Figured out why my Z axis jumped so much]]> Found the ring with two holes and tightened clockwise.  No change in bed bounce while descending (backlash).

Some other fixes that have been previously discussed.  Most people add springs.
http://www.soliforum.com/post/82365/#p82365
http://www.thehacksmith.ca/2013/03/soli … grade.html

]]> https://www.soliforum.com/user/7020/ 2015-02-09T13:38:55Z https://www.soliforum.com/post/84236/#p84236 <![CDATA[Figured out why my Z axis jumped so much]]> The tl;dr version is that there's a little ring in the middle of the z-axis motor that you can tighten.

More detail:

My Z axis was very jumpy when making small movements.  More going down than up. I removed the shroud covering the shaft and found that there's nothing bracing the bottom of the shaft at all. This was pretty surprising. If I put my finger on the end of the shaft while it moved then that damped the vibration a lot. It turns out the z-axis shaft goes all the way through the motor and there's a ring with two holes in it that you can use to turn the ring and tighten the grip on the threaded rod. I happened to have a pair of needle nose pliers that fit as if they were made for the job. I'm not sure what kind of tool is normally used for this.

I've had a lot of good pointers from this forum (mostly things to tighten on the Press) so I thought I'd share in case it helps anyone else.

]]> https://www.soliforum.com/user/9449/ 2015-02-07T22:57:23Z https://www.soliforum.com/post/83965/#p83965