[TheForge] Air Hammers Paul

Sun Apr 6 23:45:01 2003

Ok I will bite, excuse my ignorance.

1.) What is nitride steel?

2.) I am making an assumption from your description below that with the
bearing surfaces, all is ok as long as two dissimilar metals are used that
do the rubbing on each other? Correct?

Ian....

----- Original Message -----
From: "Paul Hewitt" <[email protected]>
To: <[email protected]>
Sent: Sunday, April 06, 2003 8:27 PM
Subject: Re: [TheForge] Air Hammers Paul

> 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.
> > > >
> > > >
> > > >
> > > > ---
> > > > Outgoing mail is certified Virus Free.
> > > > Checked by AVG anti-virus system (http://www.grisoft.com).
> > > > Version: 6.0.467 / Virus Database: 266 - Release Date: 4/1/2003
> > > >
> > > > _______________________________________________
> > > > http://mailman.qth.net/mailman/listinfo/theforge
> > > > theforge mail list group photo site is
> > > > http://www.photoaccess.com
> > > > Login:  [email protected]
> > > > password:  anvil
> > > > ___________
> > > >
> > > >
> > > >
> > >
> > > _______________________________________________
> > > http://mailman.qth.net/mailman/listinfo/theforge
> > > theforge mail list group photo site is
> > > http://www.photoaccess.com
> > > Login:  [email protected]
> > > password:  anvil
> > > ___________
> > >
> > >
> >
> >
> > ---
> > Outgoing mail is certified Virus Free.
> > Checked by AVG anti-virus system (http://www.grisoft.com).
> > Version: 6.0.467 / Virus Database: 266 - Release Date: 4/1/2003
> >
> > _______________________________________________
> > http://mailman.qth.net/mailman/listinfo/theforge
> > theforge mail list group photo site is
> > http://www.photoaccess.com
> > Login:  [email protected]
> > password:  anvil
> > ___________
> >
> >
> >
>
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  [email protected]
> password:  anvil
> ___________
>
>

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.467 / Virus Database: 266 - Release Date: 4/1/2003