RE: [CAD_CAM_EDM_DRO] Home Shop Machinist Drawing Files

Thanks Jon,

Can someone point me to pictures of the CNC punch head types out there?
What are the fastest punch head types?

Carl Boudreau
612-220-8720
cboudrea@...


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jon Elson
Sent: Sunday, November 20, 2005 1:39 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Home Shop Machinist Drawing Files

Carl Boudreau (pressenter) wrote:

>Very Nice site, thanks for posting it...
>
>I was impressed with the CNC punch and the EDM tools...
>
>Which of these two technologies would you all suggest I use to cut the
>letter T out of 1/16 aluminum. The letter is 9" tall and 6' wide overall.
>The top is 1.5" wide and the trunk of the letter is 1.5" wide. It has 1",
>1/2" and 1/4" holes cut out in a pattern to make it look high tech.
>
>I'd wonder what would be quicker, the CNC punch, with the finishing work
>required to smooth the cut edges, or the EDM ? Never seeing an EDM in
>operation what is the cutting speed?
>
>

SIX FEET? I don't think you are going to find too many EDM machines in that
size. Waterjet machines are available in that size, but not real common.
CNC punches that can handle a 6' sheet will be fairly easy to find. A well-
maintained punch and tooling will make edges that need very little work, but
there will be a tiny folded-over edge on the back of the sheet.

Wire EDM is an expensive process, and likely will be way to expensive for
a one-off. Waterjet shops will be more accepting, I think, for a one-off
like this. But, the CNC punch can whip out stuff faster than either of
these
by a large margin. If the letter is really 9" x 6" in size, the CNC
punch can
do this letter in a matter of seconds. Waterjet would take a minute or so,
doing the pierce-through and then cutting the letter. EDM would take much
longer, although aluminum should go faster than some materials. it
might take
a half hour on a late-model machine. I don't know if EDM is commonly used
on aluminum, I'm more familiar with seeing it done on hard steels.

Laser is another technology, but it takes a BIG laser to cut aluminum, and
all laser cutting is expensive due to machine cost and consumables.

Jon



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