Restrain a part

This is really, sorta, not a CMM question.... but then again, it is. And I have never been disappointed by the knowledge of this forum! ANYWAYS...

I have a drawing, its a sheet metal part, that in the notes says I can restrain to 10 lbs MAX.?? (to datums). How would anyone rate the poundage of a clamp holding down a part, on a CMM table? Kind of a grey area. When we have a machined parts its suppose to be measured in the 'free state' ?? Again... the part will move if you do not clamp them down. Any thoughts?? Its funny because an "engineer" will say.. "thats suppose to be in the free state" , only if their part isn't correct. And I tell them... .show me how YOUR supplier inspects this part without holding it down....nothing ever becomes of this.

Any thoughts would be appreciated!

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R2ah1ze1l over 1 year ago

For being able to target the force load, I would recommend torque gages that have adjustable settings or are at a preset load. These can be calibrated and tracked to cover yourself and operators.
As for the 'free-state', I would recommend either double sided stick tape (load by placing down and no 'pushing') or use pins to bump the part against, you could use an adjustable stop to 'bump' against the opposing side to prevent the unit from slipping across the granite while probing takes place.
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R2ah1ze1l over 1 year ago

For being able to target the force load, I would recommend torque gages that have adjustable settings or are at a preset load. These can be calibrated and tracked to cover yourself and operators.
As for the 'free-state', I would recommend either double sided stick tape (load by placing down and no 'pushing') or use pins to bump the part against, you could use an adjustable stop to 'bump' against the opposing side to prevent the unit from slipping across the granite while probing takes place.
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