[TheForge] Air Hammers Paul

Sun Apr 6 23:22:01 2003

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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