Checklist of Perforating Cost Influences

	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 are proportions 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.

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