One side of Y-axis offset during carve

Machines (Elite Series) Troubleshooting (Elite Series)
1

I am having an issue where – after a long carve – the right side of the Y axis ends up somewhat shifted compared to where it started.

When I travel to Y=0, the left side is consistently ~2mm from the edge. This is immediately after homing and after a long carve.

left-side
left-side1920×1903 219 KB

After homing, the right side is also ~2mm from the edge. However, after long carves (several hours), I find it offset. I went to Y=0 at the end of a carve and found it <1mm from the edge:

right-side-1
right-side-11920×1800 309 KB

I re-homed, ran the same exact carve again, went to Y=0, and found it nearly 5mm from the edge:

right-side-2
right-side-21920×2087 264 KB

What is the most likely cause of this? Since this is an Elite, I assume skipped steps aren’t a possible cause because it’s closed loop?

2

It looks like chips stuck in your bearing from the pictures you sent. remove them and try again see what happens

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3

I’m not understanding how a few chips would cause this? Even if it got stuck, shouldn’t the closed loop either compensate for it or trigger an alarm? It moves very smoothly, I don’t get any jerkiness. It just accumulates some during the carve and I clean it off before the next carve.

4

I’d check the motor coupler on the offending y-rail. When I was calibrating my Elite Journeyman after upgrading it, I discovered that a Y-rail coupler was loose on the pre-installed side. Following that discovery, I went through and checked both sides of the couplers on ALL axes.

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5

I think that may have been it! Definitely had a few loose screws on the couplers

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