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Shearing & Slitting
Due to the fact that perforating and roller leveling, if applicable, slightly displace and stretch material, either shearing (sheet) or slitting (coil) may be required in order to meet specified length (sheet) and width (sheet and coil) tolerances. In the event that raw material is within the desired width and length tolerance and perforating and/or roller leveling do not cause the material to exceed required dimensions, then it is possible for shearing and/or slitting to be avoided. To avoid shearing and/or slitting, tolerances need to be liberal enough so they can be held off the press. Therefore, with regard to width tolerances, the raw material vendor's tolerance should be specified as the minimum. Vendor width tolerances for carbon steel, stainless steel and aluminum are provided below.
| Carbon Steel | ||
|---|---|---|
| Material Thickness | Sheet and Coil Width Tolerances | |
| 48" and Under | Over 48" thru 60" | |
| 30GA - 7GA | -0+3/16" | -0+1/4" |
Stainless Steel
| Material Thickness | Sheet and Coil Width Tolerances | |
| 48" and Under | Over 48" thru 60" | |
| Under 0.131" | -0+1/16" | -0+1/8" |
| 0.131" and Over | -0+1/4" | -0+1/4" |
Length tolerances held off the press are dependent on the type and thickness of the material and the pattern being perforated. To find out how liberal length tolerances need to be in order to avoid re-shearing, , consult us at info@legendsgroupin.com or our Customer Service No +91-98-6888-HOLE (4653) with that information. If sheared or slit after perforating, the following tolerances are held:
| Aluminum | ||
| Material Thickness | Sheet and Coil Width Tolerances | |
| 48" and Under | Over 48" thru 60" | |
| 0.006" - 0.125" | +/-3/64" | +/-1/16" |
| 0.126" - 0.186" | +/-1/16" | +/-3/32" |
| +/-3/32" | +/-1/8" | 0.187" - 0.249" |
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