[TheForge] Air Hammers

Sun Apr 6 23:17:00 2003

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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