10 Jun
2014
10 Jun
'14
8:22 a.m.
On Monday (06/09/2014 at 04:29PM -0500), Jason T wrote:
On Mon, Jun 9, 2014 at 1:45 PM, Chris Elmquist
<chrise at pobox.com> wrote:
You're welcome. It was a fun project until it became work :-)
The precision is required in the punch pin and the holes in the jig,
both the delrin and the aluminum die. If the holes are not nice and
straight and perpendicular to the die, then the punch pin will bind
as you try to push it, making it difficult to punch the mylar media
and instead you'll just make a dent in it, wrinkle it and probably
wreck it. The pin needs to be very smooth for similar reasons and we
ended up making those from stainless and machining the punching end to
a very sharp, square point.
Precise placement of the holes in the delrin around the hub was important
too so that we didn't introduce incorrect timing for the sector marks.
I'll try to pull together a documentation package after discussing
with Dwight. Maybe he's copying this traffic here and will respond...
Chris
--
Chris Elmquist
That was Dwight and me. Dwight came up with the
concept and I had a
friend with a precision, custom machine shop build them from delrin and
stainless. We built both 10-hole and 16-hole models but unfortunately
they are all in the hands of users now.
My friend won't build more because they were a lot more work than
anticipated and his deal is one-off prototype work and not production.
So, I can't offer to make more from here.
Just how much precision is needed? (Not doubting you - I don't really
know.) Is it something that someone with decent shop skills could
replicate out of hardwood or some other material?
I have one each of your original plastic/steel punches - thanks for
creating them!