Centroid Community CNC Support Forum

Please post a FRESH Report

tuffduck wrote: ↑Wed Apr 28, 2021 7:31 pm Thanks, I think this is the culprit. The set screws are tight but I notice a little jarring motion a couple of times. I will take it apart tomorrow and loctite the couplers to the shaft.

Where are the bolts for that pillow block bearing? Check all the mechanicals as Keith mentioned.
Marc has a good routine for testing backlash. From his website: http://www.cncsnw.com/LashHowTo.htm
Run it as a test...

If you have a stepper driven machine, you may be pushing the Y axis too hard and loosing steps.
Try and temporarily reduce your rapids and feed rate and see if the problem improves.

DO post a FRESH report

Here is a fresh report. I tried reducing the rapids and nothing changed. I have included images. The pillow block bearings were welded on by the fabricator.

I went through the update schematics for V4.64 and noticed this diagram for Gecko 201X drives. Is the DB25 board required? My machine was working fine without it.

i don't see anything wrong with your configuration that would cause this...
go back and look at the machine itself, my guess is slip or drag.

Okay, thanks, checked everything, adjusted a couple things. Added another set screw to the he motor hub and loctited the hub and key in place. Will run it again to see the results.

Ran more parts today. First 7 no problem. The next set of 4 was entirely different. Pictures and report attached.

something is loose

Running out of ideas of what and how to fix it. I am thing of adding extra collars to the pillow block bearings. There is nothing left to tighten.
https://bearingfinder.ntnamericas.com/i ... lars/el208

I sent photos of what happening as well as photos of the bearings to a local bearing supplier to find out that they were eccentric collars vs concentric collars, so they would lock in one direction and loosen in the opposite direction. Replaced them today any ran parts and all is checking out so far. Thanks everyone for your efforts.