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Restrain a part

slipper57
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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  • All I know is back in the day, an OEM told use max 5 pounds to get the part to the net. Also told us how to check that.

    He said NO ONE, ever, in the history of the world can exert more than 5 pounds of force straightening the ring finger on either hand.

    HOW he knew that 'no one ever' could do this, I have no idea. BUT, yeah, you can not exert much force straightening your ring finger.

    Not that this really helps much, but IMO if you can get the part down to the table by pushing be straightening your ring finger on it, then the clamp matters not as you know it is less than 5 pounds of force to get it to the table.

    Otherwise you will have to purchase fancy load cells or some such and put them between the clamp & part.
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  • All I know is back in the day, an OEM told use max 5 pounds to get the part to the net. Also told us how to check that.

    He said NO ONE, ever, in the history of the world can exert more than 5 pounds of force straightening the ring finger on either hand.

    HOW he knew that 'no one ever' could do this, I have no idea. BUT, yeah, you can not exert much force straightening your ring finger.

    Not that this really helps much, but IMO if you can get the part down to the table by pushing be straightening your ring finger on it, then the clamp matters not as you know it is less than 5 pounds of force to get it to the table.

    Otherwise you will have to purchase fancy load cells or some such and put them between the clamp & part.
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