Pickup offsets keep moving while our spacer grip gets less square

LeahBell0669 · 31 Jul 2026, 13:58 UTC

Reply to discussion
LE
LeahBell0669
My UR5e fixture-to-tray transfer has become unreliable. We keep nudging pickup positions on the shared tray station. The rigid spacer sits less square in the gripper, although the tray looks unchanged. What physical comparison should come before another program edit?

16 replies

RE
ReeceArcher0384
Replying to LeahBell0669

Save the current offsets first. Otherwise the history disappears during the inspection.

19 points
AI
AishaBarnes0605
Replying to LeahBell0669

What is visibly out of square: the spacer against the fingers, or the whole tool against the tray? Those are not the same observation.

21 points
CH
ChloeBennett0744
Replying to LeahBell0669

An apparently unchanged tray does not exclude seating or contamination at its locating surfaces. Have maintenance inspect the secured setup under the applicable isolation procedure before using the program to compensate.

20 points
JO
JoAdams0157
Replying to ChloeBennett0744

I would resist turning this into a complete strip-down immediately. Photograph the assembled condition and compare accessible reference features first, within your inspection procedure. Dismantling everything can remove the thing you wanted to understand.

13 points
CH
ChloeBennett0744
Replying to JoAdams0157

That is reasonable. I meant a controlled inspection, not dismantling by default. The as-found condition is particularly important when several small program adjustments have already accumulated.

15 points
LE
LeahBell0669
Replying to AishaBarnes0605

The spacer looks angled against the fingers. I cannot yet say the tool itself changed angle. The tray comparison has only been visual, with no reference measurement.

7 points
AI
AishaBarnes0605
Replying to LeahBell0669

Then write those as two separate observations. Check finger contact and spacer seating, not an assumed arm drift.

22 points
RE
ReeceArcher0384
Replying to LeahBell0669

Any retained spacer from when pickup was reliable?

17 points
JO
JoAdams0157
Replying to ReeceArcher0384

Reece's comparison is useful only if the old piece is still representative. A convenient undamaged sample can miss current size or surface variation. I would include actual current pieces, without treating either group as proof on its own.

15 points
LE
LeahBell0669
Replying to ReeceArcher0384

I have current spacers available. I do not have an identified earlier sample. I will not label a loose piece from stores as our former reference.

7 points
CH
ChloeBennett0744
Replying to LeahBell0669

Use the specified part and tooling requirements as the reference, then record what the current assembly shows. Photographs can explain the contact pattern but cannot by themselves establish every relevant dimension.

6 points
AI
AishaBarnes0605
Replying to ReeceArcher0384

Also record which offsets were changed and why. Were they correcting a repeated direction, or different misses?

22 points
RE
ReeceArcher0384
Replying to AishaBarnes0605

That distinction could save a lot of arguing about the arm.

17 points
LE
LeahBell0669
Replying to AishaBarnes0605

I can recover the edits, but the reason notes are poor. Maintenance has the as-found inspection request. There is not enough evidence yet to call the fingers worn.

5 points
JO
JoAdams0157
Replying to LeahBell0669

Please include any permitted cleaning or adjustment in the record when it happens. If the next comparison changes, knowing what was touched matters more than everybody agreeing that the setup now looks better.

8 points
RE
ReeceArcher0384
Replying to JoAdams0157

And keep one person responsible for recording changes during that check.

16 points

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