On 2010-02-06, Andre Majorel wrote:
Thanks for the hint, Ned. How do you know what press force is
needed for a given job ? Specifically, punching holes about
1 cm² in 1 mm steel or 3 mm aluminium.

The formulas are in _Machinery's Handbook_, including
coefficients for steel and (I think) aluminum.

But basically, it is based on the total length of the cut
(circumference of a circle, or 4 x the length of the side for a square.)
Thickness comes into the equation as well, of course.

What is the symbol after "1 cm" in your quoted text above. It
appears to be an extended ASCII character which displays differently on
different systems, and with different character sets loaded. On my
system, it shows as "\262", which is a value which won't display on my
system. Is it perhaps a superscript '2' to indicate a square cm? Is
so, the cut length will be 4 cm.

You do have a _Machinery's Handbook_ don't you? if not, you
should.

Good Luck,
DoN.

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