our bracket nest seats differently before anyone tightens the clamp

NaomiBrown0941 · 29 Jul 2026, 21:16 UTC

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NA
NaomiBrown0941
I am reviewing a UR5e-loaded inspection nest for milled support brackets; its many CAD contacts look reassuring but bench samples seat differently, and I want the locating scheme checked before we pay for the stronger clamp being suggested.

15 replies

BR
BrunoBrown0887
Replying to NaomiBrown0941

What is each contact supposed to locate? If two features demand incompatible positions, more clamp force won't explain which one should win.

7 points
CL
ClaraAli0176
Replying to NaomiBrown0941

Before condemning the nest, check the sample faces and obvious contamination. I've seen a chip make a reasonable tool look badly designed. Not saying that's your case.

16 points
YA
YasminAli0180
Replying to BrunoBrown0887

And ask the loader how the bracket gets into it. A guide may look redundant once seated while still doing useful work during loading.

23 points
NA
NaomiBrown0941
Replying to BrunoBrown0887

The drawing calls every pad support, with no distinction between guides and locating contacts; I have asked the designer to mark their intended roles.

-6 points
BR
BrunoBrown0887
Replying to NaomiBrown0941

That's not enough definition to approve a stronger clamp. Does the inspection datum scheme appear on their drawing at all?

9 points
CL
ClaraAli0176
Replying to BrunoBrown0887

Bruno, the role drawing matters, but I'd still preserve the condition of the actual bench samples. We could otherwise blame the design for one damaged face.

13 points
NA
NaomiBrown0941
Replying to ClaraAli0176

Inspection is checking the samples; I am keeping the seating observations separate from its dimensional results so one does not substitute for the other.

17 points
BR
BrunoBrown0887
Replying to ClaraAli0176

Agreed. I was objecting to approving the clamp, not claiming we'd proved conflicting contacts.

12 points
CL
ClaraCarter0959
Replying to NaomiBrown0941

Can you repeat the manual seating with one identified bracket before comparing different brackets? That separates inconsistent placement of the same part from variation between parts.

7 points
YA
YasminAli0180
Replying to ClaraCarter0959

For Clara Carter's comparison, keep the loading direction recorded too; don't make the operator improvise a new approach on every repeat.

7 points
NA
NaomiBrown0941
Replying to ClaraCarter0959

The same bracket repeats consistently, but another sits on a different combination of pads; inspection found both within their checked drawing requirements, and the designer is reviewing those contacts.

12 points
CL
ClaraCarter0959
Replying to NaomiBrown0941

That points the next review towards how permitted part variation meets the nest. It doesn't mean every within-tolerance bracket has been demonstrated. Keep the sample identities with the contact observations.

6 points
CL
ClaraAli0176
Replying to NaomiBrown0941

Has the designer proposed a contact change, or are they still asking for a harder clamp?

5 points
NA
NaomiBrown0941
Replying to YasminAli0180

They are separating the guide function from final location in a revised proposal; thanks Yasmin, I nearly asked them to delete a guide the loader actually needs.

6 points
YA
YasminAli0180
Replying to NaomiBrown0941

Glad it stayed in the discussion. I'd have the loader review the revised approach before the bench comparison, then let the comparison decide whether seating is actually improved.

13 points

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