[GreenKeys] 32/33 print hammer

Sun, 24 Aug 2003 21:42:32 -0400

Hi

That's the sort of thing I was afraid of.

Is the disk it snaps around part of the hammer or is it a separate part?

In other words is there a third part (disk) floating around in all of this?

If the disk comes off of the hammer arm then we might simply be able to
replace the whole thing. If it is part of the hammer it's self then I agree
that we would need to come up with something to address the issue.

One idea we haven't talked about - silicone rubber. I have used it to pot
and cast all kinds of weird things. You can get it in a variety of hardness
grades. Most of what I have seen would be a bit soft for this application. I
suspect though that there are compositions out there that would be hard
enough.

What I'm thinking of is a *simple* mould. All it would be is a hole in a
block with a bump in the middle. You would pour the goo into the cavity and
the top surface of the pour would be the front of the hammer.

Usually silicon rubber is the last thing you try to use due to cost. I
*think* it does well in heat and oil. It certainly does well in heat alone.

Silicone may triple the cost of the project, but we started out spending
pocket change. Three times pocket change still may not be a lot.

I'm going to have to go up to storage and take a look at a couple of model
33 hammers .... The ones I have don't have original rubber faces on them.
They were modified with a glob of silicon RTV cement ... I never tried to
cut it off to see what was under it.

    Take Care!

        Bob Camp
        KB8TQ

----- Original Message ----- 
From: "Randy McLaughlin" <[email protected]>
To: <[email protected]>
Sent: Sunday, August 24, 2003 6:40 PM
Subject: Re: [GreenKeys] 32/33 print hammer

> ----- Original Message ----- 
> From: "gil smith" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, August 24, 2003 4:21 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.
> <snip>
>
> Try to keep it simple:  Two pieces of rubber glued together, one flat .5"
> and one "washer" .5" od smaller id making a rubber cup to glue on.
>
>
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