[GreenKeys] 32/33 print hammer
ed sharpe
ed sharpe" <[email protected]
Sun, 24 Aug 2003 14:47:54 -0700
if anyone starts providing replacements for these please keep us on file
for some.
we have a couple 33's that we need to fire up here at the museum.
Thanks Ed Sharpe archivist for SMECC
Please check our web site at
http://www.smecc.org
to see other engineering fields, communications and computation stuff we
buy, and by all means when in Arizona drop in and see us.
address:
coury house / smecc
5802 w palmaire ave
glendale az 85301
----- Original Message -----
From: "gil smith" <[email protected]>
To: <[email protected]>
Sent: Sunday, August 24, 2003 2:21 PM
Subject: Re: [GreenKeys] 32/33 print hammer
> Folks:
>
> A correction to my earlier post. I just dug out a bag of 33 parts, and
> found an NOS hammer. It is very soft now. The diameter is pretty darn
> close to 0.5", and the outside edge measures about 0.18". However, it
> designed to snap around a disc for retention, so the center is only about
> 0.085" thick. Well, that is the best I can tell, according to my
> micrometer sloppily oozing into goo that was once useful rubber.
>
> Unless we find someone with an end mill to burrow a hole into the rubber
> (if rubber can be milled at all), we are left with applying a flat sheet
> for hammer replacements. Which, as best I can tell, should be about
0.085"
> thick.
>
> So I went to pull off the old hammer on the 33, which I thought had
> hardened, judging by the cracks around the edge. It was actually soft goo
> as well. But I could see, well, feel, the raised disc that the hammer
> snaps over, for retention. It is flat on top, so the hammer would glue
> onto it directly. I suppose if the glue oozed around the mounting disc,
it
> would add a bit of lateral retention as well.
>
> Robert Downs seems to know the materials science end of this elastomeric
> mystery. If you guys find an appropriate sheet rubber source and
adhesive,
> I'd be happy to punch them out.
>
> gil
>
>
> At 01:08 pm 8/24/03, Bob Camp wrote:
> >Hi
> >
> >Half inch diameter sounds easy to hit with fairly simple stuff. I suspect
> >that something near 0.2 inch thick is a standard sheet thickness.
> >
> >Is the original part flat on both sides or is there a retaining bump on
the
> >back of the part?
> >
> >My recollection of the original rubber used was that it came fairly close
to
> >an eraser on the end of a pencil. It was a little softer, but not by a
lot.
> >Of course that's based on a quick observation 20+ years ago. I may be way
> >off ....
> >
> >The main idea about the punch was to make it quick to run off a bunch of
> >them. One person could probably wack out a lifetime supply for everybody
on
> >the list in a few hours. Postage to distribute them would cost more than
the
> >material and the time.
> >
> > Enjoy!
> >
> > Bob Camp
> > KB8TQ
> >
> >
> >----- Original Message -----
> >From: "gil smith" <[email protected]>
> >To: "Bob Camp" <[email protected]>
> >Cc: <[email protected]>
> >Sent: Sunday, August 24, 2003 3:47 PM
> >Subject: Re: [GreenKeys] 32/33 print hammer
> >
> >
> > > Hi folks:
> > >
> > > My quick measurement of a 33 hammer shows it to be about 0.5" dia by
0.2"
> > > thick.
> > >
> > > I like Don's idea of using the peel-n-stick bumpers -- I have some 3M
> > > bumpers from DigiKey (#SJ5012-0), that measure about 0.5" dia by 0.15"
> > > thick. Dunno if slightly thinner is a problem or not. The rubber
seems
> > > kinda soft -- anyone know what the original rubber was like? The
original
> > > one in my machine is rather hard with age. Bet this bumper would work
> > > though, even if it needs a small shim to make it thicker. The big
> >question
> > > would be the bumper's adhesive.
> > >
> > > If someone finds a rubber sheet that is appropriate, you probably
don't
> > > need to punch it into a nice circle. I'd bet that hacking it to an
> >octagon
> > > with an xacto knife would suffice. Though I do have a bench punch
with a
> > > 0.5" die set if anyone wants a bunch made. I have some 3M 467 sheet
> > > adhesive that could be applied before punching; then you just peel
off
> >the
> > > paper backing and apply the new hammer pad. 467 is a pretty good
> >adhesive,
> > > but, as mentioned previously, how it stands up in heat and oil is a
good
> > > question.
> > >
> > > Before mounting the bumper, you would want to clean the hammer
mounting
> > > plate with something like lacquer thinner, to remove all oil.
> > >
> > > gil
> > >
> > >
> > > At 11:12 am 8/24/03, Bob Camp wrote:
> > > >Hi,
> > > >
> > > >One fairly simple thought:
> > > >
> > > >Sheet rubber is a common item. You can get all sorts of compositions
and
> > > >thicknesses fairly easily. Last time I went shopping there were
several
> > > >local suppliers. They would sell you a couple of square yards of
stuff
> > > >without any real hassle. The question always is which rubber to use.
> >Again
> > > >there are zillions of different compositions.
> > > >
> > > >Once you have the raw material you need a punch to blast out the
print
> > > >hammers. Last time I looked at one (gulp .... *several* years ago)
they
> > > >looked like a round disk without any real fancy stuff associated with
it.
> > > >Don't remember if they had a little nubbin on the back side of them
or
> >not.
> > > >
> > > >Even if it's a punch you can't buy at the leather working counter
down at
> > > >Hobby Lobby a rubber punch is not to hard to make.
> > > >
> > > >Given the punch and the raw material making a couple hundred
imitation
> >print
> > > >hammer pads shouldn't take more than an hour or two.
> > > >
> > > >The questions:
> > > >
> > > >What are the dimensions of a "real" print hammer pad?
> > > >
> > > >What's the right material to use (need one that's soft enough and
holds
> >up
> > > >to heat and oil) ?
> > > >
> > > >Given that information the rest *should* be fairly easy.
> > > >
> > > > Enjoy!
> > > >
> > > > Bob Camp
> > > > KB8TQ
> > > >
> > > >
> > > >
> > > >----- Original Message -----
> > > >From: <[email protected]>
> > > >To: <[email protected]>
> > > >Sent: Saturday, August 23, 2003 6:53 PM
> > > >Subject: [GreenKeys] print hammer
> > > >
> > > >
> > > > > What i need are suggestions as to what material to use and what
type
> >glue
> > > >to use to make a print hammer for my Model 32. It is my understanding
> >that
> > > >print hammers are not availiable as they all turned to mush.I no
longer
> >like
> > > >the idea of my model 32 just sitting here idle because of a little
round
> > > >peice of rubber.Shurly someone out there has solved this problem and
got
> > > >their machine back into service.Wayne WB0CTE
> > > > >
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