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.
I am starting to get the same responses here, at work.... NOBODY knows! No matter how the part is held, its restrained. You can use double sided tape, tacky gum, these also will pull down/restrain .030/.060 thick aluminum sheet.
I like the notes that say, 'restrain against datumns without exceeding the elasticity of the material' . This note that says to restrain to 10 lb max,,, WHAT!?? Someone mentioned 'load cells".... well, isn't that a grey area also? Having two clamps set at 10 llbs each..?? would that be legal? lol!! I'm going to recommend re-wording this note so the next generation, when I retire, can make sense of it. Thanks for your response
I have been working with pcdmis and automotive sheet metal for over 30 years and have never seen a call out that states and maximum lb pressure. I have pretty much inspected parts for every car maker. Which car maker is this from?
Paul Sarrach we have the push pull ones. The gages are fixed to a base plate that slides on a track (T slots with a thumb screw) this allows us to set a prescribed amount of force either pushing or pulling and lock the base down as needed.
for the dive weights we have designated amounts we can use per inch / foot up to a max amount. kind of a PITA as we sometimes have to modify cmm programs to avoid the weights.