[TheForge] JYH Trip Hammer question

Thu Nov 28 21:42:05 2002

If you already have a decent compressor definately go the air hammer route,
less engineering and a better hammer in my opinion. I built a JYH (its on
the JYH anvilfire page) and like my air hammer a lot more.
Be careful with old leaf springs, a lot have cracks all through them, forge
out a chisel or something first from the spring and see how it holds up.

----- Original Message -----
From: "Peter Fels and Phoebe Palmer" <[email protected]>
To: <[email protected]>
Sent: 28 November, 2002 6:36 PM
Subject: Re: [TheForge] JYH Trip Hammer question

>
> Dan:
> Questions to Jock D are directly and " properly" addresses to Jock himself
> http://anvilfire.com/gurusden/. He generally answers pretty promptly.
> Your spring size and  connecting rod strength questions are  dependant on
> the weight of your hammer and the HP and RPMs you are going to put into
it.
> The thing I'd do is, look at comparable hammers with similar mechanisms
> that have survived.
> Strive to get as much solid mass  immediately under your hammer as
possible.
> Mild steel  for hammer faces ( super quenched ideally) suffices as long
as
> you only work hot mild steel or iron.
> Pass on Jock's shock absorber linkage.
> Have read that power hammers of this type in the orient have long soft
> springs and a long  stroke and tend to  be slower.
> Hard packed sand that is capped will add a bit of strength to the upright
> and damping.
> Under the anvil you want as much solid metal as possible.
> Get the " pounding out the profits" book as a stylish path to self
education.
> Or find an old worn out hammer and rescue it....Pete
>
>
> At 05:30 PM 11/28/02, you wrote:
> >REF: NC-JYH
> >REF URL http://www.anvilfire.com/power/
> >
> >I am going to start to put together my JYH power hammer (a copy of the NC
JYH
> >from the anvil fire site) and I have a question (Jock..if you are
> >listening, I
> >think you are the one to answer this but I will take advice from anyone).
> >Jock told me to use a leaf spring for the hammer mechanism. Now here are
the
> >questions
> >
> >1. What diameter is the rod connecting the wheel to the mechanism?
> >2. Should I reinforce the wheel (the metal part..rim?) to take the
continued
> >extra shock of the above mentioned rod everytime the hammer hits the
anvil?
> >3. I found a regular size leaf spring of an old station wagon.  I would
have
> >to heat and bend it and I think that this would affect the spring and I
dont
> >think that I could get the spring back to "springyness"....so I thought I
> >should buy a small leaf spring for a dune buggy (I found them at Northern
> >Tools).  Advice?
> >4. Surface of the anvil and the hammer....any good particular choices?
tool
> >steel? High carbon something of other?
> >5.  Will filling the upright and the anvil with sand add stability,
strength,
> >dampening....or am I just out of my head here?
> >6. Will I stop asking questions long enough for someone to answer?
> >
> >
> >
> >Okay .....
> >
> >Advice?
> >
> >Dan
> >www.irontreework.com
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