Cannot select FR5 housing tooling while both quotes weigh only the part

BrunoBrown0887 · 13 Jun 2026, 08:04 UTC

Reply to discussion
BR
BrunoBrown0887
Two nest-transfer proposals, both defended using the motor housing's mass alone. Extended fingers, adapter and fittings apparently weigh nothing. What should I require for a proper loaded-assembly comparison?

19 replies

HA
HarishBell0663
Replying to BrunoBrown0887

Which complete assembly does either supplier say it has assessed? I'd want the loaded mass properties, orientations and motion assumptions against the applicable robot limits, with drawing references that include your actual fingers rather than a catalogue gripper.

11 points
BE
BenAli0196
Replying to HarishBell0663

The offset is as important to establish as the total. Adding all the kilograms won't answer where the load sits or how the proposed move affects it.

22 points
BR
BrunoBrown0887
Replying to HarishBell0663

Neither names a complete assembly. One gives a standard gripper sheet; our longer fingers appear only in the quote sketch, with an adapter below them.

14 points
LE
Lewis_Burke
Replying to BrunoBrown0887

Standard fingers make wonderful paperwork. Ours became longer on the bench and heavier in reality.

20 points
FR
FrancesCasey
Replying to Lewis_Burke

Lewis, was the load assessment revised after that change, or did the installation retain the standard-tool figures?

9 points
LE
Lewis_Burke
Replying to FrancesCasey

Revised before release. The designer caught it while checking the installed assembly against the drawing.

10 points
AN
AnikaBarnes0595
Replying to Lewis_Burke

That is why I would name a revision owner in Bruno's purchase scope. The initial review matters, but somebody also needs to decide when a tooling change requires reassessment.

12 points
NA
NathanBell0634
Replying to AnikaBarnes0595

Our trainer got the old tool picture after a fitting moved. The operators learned the new clearance from whoever happened to be nearby. I'd include the installed arrangement in handover, once it actually exists.

4 points
AA
AaronChan1045
Replying to BrunoBrown0887

A complete CAD assembly can help establish the missing geometry before hardware exists, provided material assignments and included components are checked rather than treating the software's mass number as self-validating.

16 points
EL
ElliotArcher0422
Replying to AaronChan1045

And note what remains estimated. A tidy centre-of-gravity coordinate can be calculated very precisely from a fitting somebody guessed.

13 points
JO
JoAli0244
Replying to BrunoBrown0887

Are both tools supposed to release the housing into the same nest orientation?

13 points
BE
BenAli0196
Replying to JoAli0244

Jo's question matters. A shorter adapter may look better on a load sheet and still leave Bruno with a release path that clashes with the nest.

9 points
BR
BrunoBrown0887
Replying to JoAli0244

Same required placement, Jo. One designer uses a longer approach offset to clear the nest. I'll compare their complete assemblies, not force identical tools onto the same mass sheet.

10 points
HA
HarishBell0663
Replying to BrunoBrown0887

That sounds fair. I would still ask each supplier to state any reduced motion or changed incoming presentation its proposal relies on, so the favourable load case is also a usable production case.

6 points
NA
NathanBell0634
Replying to HarishBell0663

Harish, the changed incoming presentation is the bit I'd watch. A supplier once made our handling problem easy by giving the operator a new arrangement job. Perfectly possible solution, not free.

9 points
AN
AnikaBarnes0595
Replying to NathanBell0634

Nathan, agreed. The purchase comparison should carry that work openly alongside the technical assessment, without implying a technically suitable tool is automatically the better operating choice.

12 points
FR
FrancesCasey
Replying to BrunoBrown0887

Has either returned an assessment tied to its complete proposed drawing yet, Bruno?

11 points
BR
BrunoBrown0887
Replying to FrancesCasey

One has returned mass properties for its complete proposal. Integrator found the hose arrangement still unspecified, so review remains open. The other supplier has not supplied the missing assembly information.

14 points
EL
ElliotArcher0422
Replying to BrunoBrown0887

Then no winner yet. I'd like to hear whether the longer-offset option survives the review, but the catalogue sheet certainly hasn't earned the other one a pass.

11 points

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