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squareness measurement problem

openhearth

Plastic
Joined
Sep 9, 2012
Location
Linden, NJ, USA
OK Inspectors! I need your help on this one.

The part is an angle with equal length legs of 3 inches. The squareness for the part is given on the print from the inside, not the outside. It must be square to 90*, plus 2*, minus 0*. The blade of a square placed against one leg can be up to 2* leaning out. How would you measure that and be within that tolerance? I don't have a CMM. In advance, thanks for all input!!!
 
Sine of 2 degrees times the length of the leg the square is contacting would give you the error in thousandths.

You could use a thickness gauge of some sort between the blade and the leg to check it.

Unless I am misunderstanding...
 
Thanks guys, all great answers. I went with the protractor route. The measurement had to be made on the shop floor before the cold saw operator started cutting the proper lengths. It was actually the press operator that caught the problem that some of the legs were bent inward. I had to reject nine pieces of 192". Incoming material is my greatest challenge these days. Anyone else seeing this? Thanks again for your feedback!!
 








 
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