[TheForge] Air Hammers Paul

Sun Apr 6 23:35:00 2003

The slides on my original hammer were simply two different grades of steel,
I have an abundance of nitride steel laying around, so I used some pieces of
that, and a few pieces of some 4140 for slides, I have long since sold the
hammer, and the current owner uses it almost every day, to my knowledge it
has never broke down and he has never had to adjust anything.

----- Original Message -----
From: "Ian" <[email protected]>
To: <[email protected]>
Sent: Sunday, April 06, 2003 10:18 PM
Subject: Re: [TheForge] Air Hammers Paul

> This is interesting Paul cause I was also wondering how steel on steel
would
> wear when greased compared with brass on steel? Steel is certainly
cheaper!
>
> ----- Original Message -----
> From: "Paul Hewitt" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, April 06, 2003 8:09 PM
> Subject: Re: [TheForge] Air Hammers
>
>
> > The problem with UHMW is that if "cold forms"  UHMW is actually Ultra
High
> > Molecular Weight Polyethylene AKA Milk Jugs....  which are LDPE low
> density
> > Polyethylene.  high load forces, speeds and impact cause the material to
> > deform, the larger the tolerance gap the move "slamming: it will do,
thus
> > the faster it will deform into an unusable state.  Also UHMW prefers a
> > ground and polished surface in bearing type applications, which is hard
to
> > accurately do on the slide of a hammer.  The hammers I have built in the
> > past are not even brass, just simply greased steel on steel.
> >
> >
> > ----- Original Message -----
> > From: "Ian" <[email protected]>
> > To: "TheForge" <[email protected]>
> > Sent: Sunday, April 06, 2003 9:59 PM
> > Subject: [TheForge] Air Hammers
> >
> >
> > > Instead of using brass bearings for the hammer and slider, has anyone
> used
> > > UHMW which is a high abrasion resistant, low friction, chemical
> resistant,
> > > tough - hard wearing plastic. UHMW stands for ultra high molecular
> weight.
> > > This stuff is used in industry on things like fork lift chain guides,
> > roller
> > > lines for boxes etc. This stuff is tougher than you know what! My only
> > > concern about using this stuff would be that of heat from any possible
> > > friction between the hammer slider and the plastic. Any thoughts
there.
> > Oh,
> > > this stuff that I have seen is usually white.
> > >
> > >
> > >
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