[TheForge] Air Hammer Cylinder and valve combination

Fri Feb 27 07:01:01 2004

Can I hear an "amen" for Brother Dave?

I agree with you 110%.  I don't think it pays to buy
air components that "may" work just cause they are on
sale.

I would stick with either what is in the Kinyon plans,
or the air scheme on the AFC web-site, which is what I
used.

Phil Rosche
Summerville, SC

--- magichammer <[email protected]> wrote:
> Although it is a heavy investment for some of us, to
> me it was worth
> saving up the $500 and buying the new air parts that
> Ron Kinyon
> recommended in the plans in the first place, and
> here's why.......
> Kinyon was a pneumatics engineer for GM. He knows
> his stuff and
> he has already worked out all the bugs. At least 5
> or 6 of us here in
> southern Louisiana have built the Kinyon hammers
> using these parts
> http://magichammer.freeservers.com/pdi_quotation.htm
>  and have
> had no problems.
> The chances that anyone is going to improve on
> Kinyons design are
> slim in my estimation and the chances of less than
> great success are
> high. We have all read posts here about what does
> and doesn't work.
> If one saves money by buying mismatched surplus
> parts and they
> give you less than desired results, then you haven't
> saved anything.
> In fact you have wasted that money because you have
> to end up
> buying the right parts later on anyway.
> This is in no way intended to belittle the Mark Linn
> modifications.
> http://afc.abana-chapter.com/
> I have not used a hammer that uses his sistem so I
> cannot address it.
> I do think however, that Mark uses new air parts as
> well, which is what
> my point is all about.
> dave m
> 
> ----- Original Message ----- 
> From: "Don Sinclaire" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, February 26, 2004 8:01 PM
> Subject: [TheForge] Air Hammer Cylinder and valve
> combination
> 
> 
> > Mark:
> > I started building an air hammer a couple of years
> ago.  I used a surplus
> 12
> > inch by 2-1/2 inch cylinder and a surplus 5-way
> valve.  The Ram is about
> > 15-20 pounds.  The ports on my valve are only 5/16
> inch in diameter by the
> > time the hose barbs are screwed into the valve
> body.  Although the hammer
> > went up and down, it could not strike a very hard
> blow. I planned to use a
> > light weight ram and and depend more on speed than
> mass, since my anvil is
> > only 150 pounds.
> >
> > It turns out that as the ram went down, it trapped
> too much air in the
> > bottom of the cylinder, so that air cushioned the
> blow at higher speeds.
> > The cylinder could not "exhale" fast enough. It
> worked OK if I reduced the
> > stroke to about 5-6 inches.  I then strapped a
> 14-inch piece of rail to
> the
> > ram to add weight and it started to hit harder,
> but slower.
> >
> > I still check the surplus shop for valves from
> time to time, hoping to
> find
> > one with larger ports.  (A new one is a couple of
> hundred dollars.)
> >
> > Since you are using a relatively large cylinder,
> make sure you get a large
> > valve.  You probably know more about that than I
> do, but I thought I would
> > mention that.
> >
> > I would like to see a picture of the finished
> hammer.  Good luck.
> >
> >
> >
> 
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