[TheForge] Punching holes with Hydrolic press

[Jason Nass]

On a slightly related note: why have I never thought of using a Whitney
punch to put holes into my thin stuff like the horseshoe nail hooks I make?
Thanks for spurring this thought into my head... also, what you have there
is sort of similar to a Whitney punch, I might try a hand version of your
idea for a fast punch tool for thin stock out at faires...

Jason Nass
me at wargoth.com

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Andrew Vida
Sent: Wednesday, October 05, 2011 7:00 PM
To: Bob Ehrenberger; Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] Punching holes with Hydrolic press



On 10/4/2011 2:22 PM, Bob Ehrenberger wrote:
> The
> only problem is that the material sticks to the punch and has to be
knocked
> off after raising it up.  It's a whole lot easier than drilling big holes
in
> thin material.

Your clearance is too large.  I'd keep it to 0.010".  Also, a 1* or 2* 
negative draft angle for clearance with perhaps a 0.30" margin, like so:

          |          |
          |___    ___|
             /    \
            /      \<--- 2* - 4* included relief
            |______|<--- Margin

The margin serves two purposes: it strengthens the edge and provides 
some allowance to redress the punch for wear.
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