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Brown-Campbell Company
Brown-Campbell Company
Specialty Steel Manufacturer,
Fabricator & Distributor Since 1952

Perforated Design Details

End Patterns & Side Margins

End Patterns

“Unfinished”- Standard end pattern at the beginning and end of the work piece resulting from the stepped perforating procedure pattern.
“Finished”- Requires special tooling or idling of the last row of punches to complete the pattern, thus slowing the perforating process and increasing costs. The finished end pattern is not standard and should be specified if desired.
Perforated Metal - End Patterns

Side Margins

Margins along the sides of the perforated sheet introduce stresses into the sheet and cause distortion, so they should be kept to a minimum width. Excessive or uneven margins can actually cause buckling or a degree of distortion that can’t be completely corrected by roller leveling. Additionally, when holes are small and the percent of open area is high, distortion can become exaggerated. The minimum side margin is determined by the die layout and the thickness of the material.

Perforated Metal - End Patterns & Side Margins