[GreenKeys] 32/33 print hammer

Sun, 24 Aug 2003 16:08:25 -0400

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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