Checklist

Perforating Cost Influences Checklist

1. Material type – Remember the least expensive material may not be the lowest cost, a higher strength alloy may allow reducing thickness. Keep hardness below 80 Rb.

2. Material thickness – Thinner materials perforate easier and faster.

3. Hole shape and pattern – Round holes are the most economical, 60° degree staggered round hole pattern strongest and most versatile.

4. Hole size – Do not go below 1-to-1 ratio with sheet thickness. Stay at 2-to-1 or larger if possible.

5. Bar size – Do not go thinner than 1-to-1 ratio with sheet thickness.

6. Center distance – It controls feed rate and thereby the production rate. If possible, choose a pattern with longer center distance.

7. Open areas – Extreme open areas tend to increase distortion; if possible, stay under 70%

8. Margins – Keep side margins to a minimum to reduce distortion. Use standard Unfinished End Margins if you can.

9. Blank areas – Consider the die pattern when locating them. Consult with your IPA supplier.

10. Stick to standards – Specify standard hole patterns, materials, dimensions and tolerances whenever possible. Before specifying a “Special,” consult with your IPA member supplier; he can work wonders with existing tooling.

11. Normal commercial burrs – Unless otherwise specified.