Sheet Metal Punch Angle

[Bob Pierce]

It seems as though I have read on the forum something concerning the ability to measure the tooling angle of a punched sheet metal hole. Am I making this up? I am working with an engineer who insists on measuring the angle of a hole in .048" sheet metal.

[slesholdofthreep]

BwaHaHa

[bw_bob]

I would measure perpendicularity & parallellism too.....just messin with ya

[STANLEY]

Tell him you need to check the punch (tooling), Not enough material to get a accurate check with cmm, or you could and try a shadowgraph by sectioning the art.

[#2#]

I seem to remember Matt talking about this at length sometime. Too bad he's on vacation this week.

[craiger_ny]

I am working with an engineer who insists on measuring the angle of a hole in .048" sheet metal.

There's your problem right there.

[Paul Sarrach]

If you are refering to the breakage on a punched hole, the rule is 10% so if you have a .500 hole in that .048 sheetmetal the blow out side of the hole will be .510. And the .500 will only be about .016 inch thick on the punched side, and thats where you need to be to check true position. I see more mistakes made because the pre-hits and depth are not used correctly,. This is also where a lot of error in hole size is made. There is no real angle per say, its where and how it breaks out.

[Roberto]

It seems as though I have read on the forum something concerning the ability to measure the tooling angle of a punched sheet metal hole. Am I making this up? I am working with an engineer who insists on measuring the angle of a hole in .048" sheet metal.

Is that a C'sink hole? Or He just want to check the "break"?

[Paul Sarrach]

Is that a C'sink hole? Or He just want to check the "break"?

Good question, but a C'sink on .048 sheetmetal!

[John Riggins]

Stick a pin in it, measure the angle with a protractor and tell him to go away.

[Paul Sarrach]

Stick a pin in it, measure the angle with a protractor and tell him to go away.

I like it!