Our bracket sits flat only while somebody holds it down

MinaAli0250 · 17 Oct 2025, 00:56 UTC

Closed
MI
MinaAli0250
I watched our fabricator press a finished gusseted bracket against the bench and call it flat, then it rocked when he let go, and apparently this is the example we are using to plan the FR10 fixture; I want a cheap way to settle what we are measuring before we buy a much more expensive way to hold it down

20 replies

SA
SarahBaker0502
Replying to MinaAli0250

Measure it released, on the supports specified for inspection. Hand pressure changes the check.

15 points
LU
LuisAdams0173
Replying to MinaAli0250

We had a bench with a high spot that made everything look bent. I'd get inspection to check the example somewhere known first. Cheap enough to rule out.

6 points
JO
JoFixtures
Replying to LuisAdams0173

Luis, yes on the bench, but please don't let a better bench turn into a proposal to clamp the finished bracket flatter, the customer gets it without that clamp

17 points
CA
Cameron_Bailey
Replying to MinaAli0250

Seen a demonstration done with one bolt nipped up through the foot. Looked excellent. Nobody mentioned the bolt until we asked to lift the bracket. Get the loose part in front of inspection before arguing about the new fixture.

9 points
MI
MinaAli0250
Replying to LuisAdams0173

It rocks on inspection's surface too, Luis, and Sarah they have taken it away to check the drawing supports properly, so at least I am not buying the bench a robot

8 points
LI
LiamChen1186
Replying to MinaAli0250

Who decides whether correction is allowed after welding?

14 points
AD
AdaAbbott0042
Replying to LiamChen1186

That needs the responsible quality and engineering people, Liam. The handover also needs to say who handles parts that fail; otherwise correction becomes somebody quietly leaning on them.

25 points
TO
TobyBrooks0840
Replying to MinaAli0250

Keep the example identified while it moves about. Ours got mixed with a corrected one on a trolley. Lost the afternoon explaining two different measurements of two different brackets.

18 points
FE
FelixAli0197
Replying to MinaAli0250

We priced a fixture on the assumption it would remove all straightening. Didn't happen. I'd want the quote to show the remaining correction work honestly, but I wouldn't bin a useful fixture just because it cannot do everything.

20 points
JO
JoFixtures
Replying to FelixAli0197

Agreed Felix, provided someone establishes a permitted correction method and what gets checked afterwards, otherwise the supposed saving is just work disappearing from the estimate

19 points
OS
OscarBaker0445
Replying to MinaAli0250

Why is the loose bracket not the acceptance sample in the first place?

6 points
MI
MinaAli0250
Replying to OscarBaker0445

Oscar, the sample was chosen because its welds looked good, which is fair for the weld discussion but somebody then called it our approved assembly; Toby, thanks, it now has its own tag and inspection photo

17 points
SA
SarahBaker0502
Replying to MinaAli0250

Does the drawing allow that rocking, or is a measured feature actually out?

14 points
LU
LuisAdams0173
Replying to SarahBaker0502

Good question Sarah. Rocking got us excited on another job when the important feature was the hole position. Still needed checking, but we were arguing about the wrong thing first.

10 points
MI
MinaAli0250
Replying to SarahBaker0502

Sarah, the foot flatness is outside the drawing requirement on this one, inspection used revision D, and the hole positions passed, so we finally have something less vague than wobbly

0 points
CA
Cameron_Bailey
Replying to MinaAli0250

That gives the fixture designer a real problem to discuss. Any other released samples available? One bad bracket tells you it happened. Wouldn't price the whole production story around just that one.

21 points
TO
TobyBrooks0840
Replying to Cameron_Bailey

And keep corrected samples in a separate group. Labelled, not thrown out.

11 points
AD
AdaAbbott0042
Replying to MinaAli0250

Thanks for naming revision D, Mina. Can the fixture review use that same revision? I have seen a purchasing attachment lag behind the drawing inspection actually used.

17 points
FE
FelixAli0197
Replying to Cameron_Bailey

Did the designer change the proposed fixture, or are you still collecting brackets? Curious whether this has altered the buying decision yet.

15 points
MI
MinaAli0250
Replying to FelixAli0197

Still collecting, Felix, and Ada the quote attachment was revision C so I have sent D and asked them to update it; I am not rejecting the fixture, just refusing to pretend the nice-looking sample settled it

15 points

Discussion closed

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