Hello forum
I recall touching on this subject in previous threads, hopefully it is worthwhile to bring it up again.
In my travels, many people have made it sound like there's a separate standard for sheet metal dimensioning and tolerancing, and I don't think it exists!
For example, a sheet metal part is bent at 90 degree angles in a brake press to form a channel. The print for this piece calls out a width of 5.000" +/- .030. Because the part wasn't hit hard enough in the brake press, the dimension is 5.000 near the bend lines, but 5.045 out at the top.
Some inspectors are trying to tell me that's ok because the angle tolerance on the 90 degree angle is +/- 1 degree. They say that it's acceptable to measure the part at the bend line, and NOT to measure overall lengths.
Is there any truth to this at all? Is there a separate standard or convention for sheetmetal dimensioning and tolerancing?
I recall touching on this subject in previous threads, hopefully it is worthwhile to bring it up again.
In my travels, many people have made it sound like there's a separate standard for sheet metal dimensioning and tolerancing, and I don't think it exists!
For example, a sheet metal part is bent at 90 degree angles in a brake press to form a channel. The print for this piece calls out a width of 5.000" +/- .030. Because the part wasn't hit hard enough in the brake press, the dimension is 5.000 near the bend lines, but 5.045 out at the top.
Some inspectors are trying to tell me that's ok because the angle tolerance on the 90 degree angle is +/- 1 degree. They say that it's acceptable to measure the part at the bend line, and NOT to measure overall lengths.
Is there any truth to this at all? Is there a separate standard or convention for sheetmetal dimensioning and tolerancing?
Jim