[TheForge] treadle hammer anvils

Fri Jan 10 09:41:00 2003

Ray,
Wouldn't be noticeably better than an unpresurized tube.  The compressabili=
ty of gases is the problem. =20
It worked for the bats for the same reason it works for tennis balls, etc.
Anvils are in a different league.
A simpler alternative would be to fill the tube with a liquid. The =
simplest would be hydraulic fluid (preferabley a water-based version) with =
a valve and hydraulic pump to pressurize (slightly).  The pressure would =
help drive any gas INTO the fluid, rendering the whole system incompressibl=
e.  (This works, even with only moderate pressure.  15-100 psi should =
suffice.)
Whether such a system would behave as well as a solid steel anvil is =
dubious.  The extra mechanisms would probably make it  not cost effective =
for most cases.
Bruce
NJ

>>> [email protected] 01/10/03 09:06AM >>>
Hey Guys,
Here's a question for all you hammer builder, regarding anvils:

This thread has been about pipe or built up versus a solid anvil.

How about a wacky alternative:
Build the anvil out of heavy wall pipe with a significantly heavy cap and =
base welded on, and a pipe fitting. Then pressurize the pipe as high as =
possible given the individual's compressor capability. Putting the "anvil" =
under pressure will leave the steel in tension and provide more rebound.

This used to be an old trick used by "friends" on aluminum bats in my old =
power plant days. They would pressurize the bats with hydrogen off the =
plant manifold and the softballs would fly!!!

Any thoughts?

Ray Miller
Cincinnati

>=20
> From: Steve Smith <[email protected]>
> Date: 2003/01/09 Thu PM 09:54:42 EST
> To: [email protected]=20
> Subject: Re: [TheForge] treadle hammer anvils
>=20
> I agree, the answer depends on how the hammer is used. Also, if the=20
> hammer is screwed down to a large concrete foundation, that should help.
>=20
> I don't think filling the tube with loose scrap concrete, sand, etc.=20
> will help. I think the fill would have to be firmly attached to the=20
> hammer. Just my opinion, no facts to back it up. Maybe you could fill=20
> the base with sand and put some kind of hold down on top of it to=20
> compress it. I also like Bruce's and Mike's idea of bolt on mass.
>=20
> I suspect most of the pre-made hammers use a hollow anvil so that 1.=20
> they cost less to make and 2. they cost less shipping.
>=20
> Both of the hammers I've made were solid anvil.
>=20
> Steve Smith
>=20
> GHS wrote:
> > bob, The "solid "configuration that you
> > used on mine is good and solid. That
> > being said, for the most part I do not
> > hit hard enough to really utilize it,
> > most of the time.. I use it as a striker
> > when I am holding tooling. So for me the
> > tube probably would have been fine.=20
> > If he is not likely to be stomping as
> > hard as he can most of the time a tube
> > will still make a sufficient immovable
> > object. It might be a bit noisier
> > though.
> >=20
> > Mike Graf
> >=20
> > [email protected] wrote:
> >=20
> >>i am building a treadle hammer for a friend. he is not sure whether to =
go with a solid anvil or a tube type. it seems that most commercially =
available t hammers have tube anvils with a plate on top, centaur, =
kirkpatric (the same?) and the one advertised in the hammers blow.
> >>
> >>are there others that can be bought?
> >>
> >>any opinions on the functional difference between solid or tube =
anvils? the guy i am making it for is concerned about moving it (weight). =
he lives in a flood plain and his shop has 7' of water in it some springs. =
he usaully loads thing up and moves it to high ground till the water goes =
down.
> >>
> >>bob s.
> >>
> >>_______________________________________________
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> >=20
> >=20
>=20
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge=20
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>=20
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