Camber Tolerances
Camber is the measured deviation of the side of a sheet from a straight edge. Camber is caused by one side of a sheet being elongated more than the other side during perforation or leveling. Camber often results from having unequal side margins on a sheet.
Camber is measured by placing a straight edge along the concave side of the sheet and measuring the maximum distance from the straight edge to the edge of the sheet (Figure 1).
A sheet can be sheared after it is perforated and leveled, which will make the sheet square, but the perforated pattern will still be cambered on the sheet (Figure 2).
If sheets are cut after perforation, the camber refers only to the perforated pattern. (See sketch below F & G)
Designers are requested to avoid different margins whenever possible.
Maximum Camber
| Max. Camber All Metals After Perforating | |||
|
Coils and Cut Lengtth Ft. |
Commercial Quality |
Superior Quality |
Special Quality |
| To 4 Ft. Inclusive | 1/8" | 4' = .062" | |
| Over 4-6 Ft. Inclusive | 3/16" | 5' = .098" | |
| Over 6-8 Ft. Inclusive | 1/2" | 6' = .140" | |