[TheForge] Hydraulic Press Question

Thu Aug 14 09:29:00 2003

I'm not sure that I followed every post in this thread but I didn't see a
direct answer to Bill's question regarding power requirements. I'll give it
a try.

The rule of thumb for punching round holes in mild steel is (80)(diameter in
inches)(thickness in inches)=(pressure required in tons). For example to
punch a 1/2" round hole in 1/2" stock, it requires approximately
(80)(1/2)(1/2) or 20 tons.

A more general rule, one that addresses holes that are not round is (80)(1/3
of the total length of the outline in inches)(thickness in inches)=(pressure
required in tons). Obviously, since the outline of a round hole is
(3.14159)(diameter), the rules are, for all practical purposes, equivalent.

Hope this helps,
Dan

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Woolley
> Sent: Wednesday, August 13, 2003 8:27 PM
> To: [email protected]
> Subject: [TheForge] Hydraulic Press Question
>
>
> Greetings,
>
> I don't have room nor need for an ironworker in my shop(or the
> pocketbook).  What I would like to do from time to time is punch square
> and rectangular holes through 1/4 maybe 3/8 flats and plate.  Does
> anyone know how powerful a cylinder I might need to do this?  Metal for
> tooling?  I was considering making a chanel frame  to back up the
> cylinder and hold the tooling.  Anyone have any ideas for this set up
> without breaking the bank?  Thanks.
>
> Regards,
> Bill Woolley
>
>
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