[GreenKeys] 32/33 print hammer

[gil smith]

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: <wayne476@excite.com>
>To: <greenkeys@mailman.qth.net>
>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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