Our weldment looks aligned until it comes out of the fixture

JoBell0679 · 11 Jul 2026, 20:20 UTC

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JO
JoBell0679
I'm reviewing historical records for our planned preparing robotic welding of gusseted brackets with Universal Robots UR5e and a gusseted steel support bracket weldment in a small steel assemblies factory. The notes describe alignment under restraint but dimensions outside the drawing requirement after release. I'd like to distinguish incoming fit-up, fixture location and final acceptance before carrying an unexplained correction routine into the new cell; no live welding adjustments are involved.

14 replies

PR
PriyaCarter1003
Replying to JoBell0679

Does the inspection procedure define the released condition and reference supports? Check that alongside whether each old measurement says how the assembly was held.

22 points
JO
JoBell0679
Replying to PriyaCarter1003

My sheets contain both restrained and released results, with some conditions unlabelled. Although the drawing specifies the dimension, the inspection procedure doesn't clearly define the supports.

1 points
PR
PriyaCarter1003
Replying to JoBell0679

Have quality and the drawing owner define the acceptance condition. Group the old results by known measurement state; that should make them comparable.

10 points
JA
JasperArcher0377
Replying to PriyaCarter1003

Grouping by restraint state won't fully establish comparability if reference supports, fixture revisions or process revisions differ or remain unknown within each group.

10 points
PR
PriyaCarter1003
Replying to JasperArcher0377

You're right; I overstated that. Grouping exposes one difference. Keep support conditions, fixture revision and process links visible too, including anything unknown.

12 points
JO
JoBell0679
Replying to PriyaCarter1003

Should a fixture revision remain unknown when a colleague remembers a likely version but no record confirms it? We're disagreeing about whether to fill those gaps.

-2 points
PR
PriyaCarter1003
Replying to JoBell0679

Keep the revision unconfirmed in the data. A separate note can preserve the recollection as a lead without presenting it as an established fixture reference.

15 points
ZA
ZaraBennett0743
Replying to PriyaCarter1003

On my bracket job, filling blanks from memory produced a very persuasive trend. Finding the original fixture sheets made the trend disappear. Not my favourite chart.

14 points
GA
GabrielBennett0714
Replying to ZaraBennett0743

If the fixture holds it straight, why isn't that already the result we want?

8 points
PR
PriyaCarter1003
Replying to GabrielBennett0714

Because the required inspection condition may be after release. Holding a shape under restraint doesn't establish the shape the assembly takes without that restraint.

14 points
JO
JoBell0679
Replying to PriyaCarter1003

I've had the drawing owner confirm the released inspection condition and its reference supports. Quality is adding those requirements to the sheet so the measurement state is explicit.

4 points
JA
JasperArcher0377
Replying to JoBell0679

@JoBell0679 Useful clarification. It doesn't retroactively tell you how the unlabelled old measurements were taken, though.

20 points
JO
JoBell0679
Replying to JasperArcher0377

My review approach is settled: establish the acceptance condition and use measurements with identifiable conditions. I can take that forward while leaving fixture and process changes dependent on specialist assessment.

13 points
PR
PriyaCarter1003
Replying to JoBell0679

That gives the specialists an interpretable basis for review. It leaves the actual fixture or process decision with their assessment.

16 points

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