[TheForge] Home built power hammer question

[Jerry Smith]

You may want to look up Larry Zoeler, he has plans for a good hammer. Kim George 
here on the list built mine.

Jerry




________________________________
From: peter fels <artgawk at thegrid.net>
To: Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net>
Sent: Sun, March 6, 2011 10:43:36 PM
Subject: Re: [TheForge] Home built power hammer question

I just saw part of a letter that Mark Krause wrote from jail..He's the guy you 
need here.

Hammers of that falling weight generally run at 2 or 3 swats a second.
A desirable ratio of falling weight to anvil is about 15 to 1.
You want the anvil mass oriented vertically, directly under the hammer face.
The lead weighting in the hammer head may tend to work to absorb energy from the 
blow...
solid steel would be better i think.
Horizontal layers tend to absorb energy unless welded solid..
The trick with the linkage is to arrange the rebound from the upstroke to 
reinforce the downward acceleration...
Generally a question of falling weight, harmonics and spring stiffness.
That help?





On Mar 6, 2011, at 7:11 PM, Wesley Marquart wrote:

> Its about 100# or so... it's a chunk of 12" dia steel which is 5 1/2" thick.
> This is welded to a 3' chunk of 12" I-beam with the I-beam being bolted to
> the frame.  There is a little lateral vibration to the anvil but it is
> really very little.
> Tommorrow I will change the mount out for the electric motor and put on one
> with a little more 'oomph' and a slightly larger pulley (to increase the
> speed...  Maybe that will help!
> 
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of blakkpawss at yahoo.com
> Sent: Sunday, March 06, 2011 8:58 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] Home built power hammer question
> 
> One question, how much weight is in the anvil?  If there's not enough mass
> there it may not do much work.  Also, if it runs too fast, and there's not
> sufficient shock absorption , it will bounce.  That wil transfer energy from
> the blow and lessen the work done.
> Sent from my BlackBerry Smartphone provided by Alltel
> 
> -----Original Message-----
> From: "Wesley Marquart" <marquart at arlinn-tower.com>
> Sender: theforge-bounces at mailman.qth.net
> Date: Sun, 6 Mar 2011 20:52:28 
> To: theForge<theforge at mailman.qth.net>
> Reply-To: Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net>
> Subject: [TheForge] Home built power hammer question
> 
> Greetings Gentlemen (& Ladies)
> 
> 
> 
> I've been working on my own homebuilt power hammer for some time.
> 
> 
> 
> Its gone thru a couple of iterations and it does seem to work but its just
> not putting enough force into the blows.
> 
> 
> 
> The head is a 28 pound lead filled piece of 2"x4" steel tubing.  The tooling
> I've made is bolted up to the bottom of the head.
> 
> 
> 
> The arms supporting the head are spring loaded to assist them to returning
> to the upper position.
> 
> 
> 
> The arm is pulled downward by a linkage attached to a steel wheel which
> rotates at about 1 RPS.
> 
> 
> 
> The linkage is spring loaded to allow the wheel to keep turning when the
> tooling stops out on the anvil.
> 
> 
> 
> Here is the problem:  even though the hammer does slightly flatten the
> heated stock it does not do very much on a heat.
> 
> 
> 
> I suspect that the problem is in the rate of the hammer blows. essentially
> what is happening (I believe) is that I'm basically just tapping the metal
> out because of the slower speed not allowing too much inertial to be built
> up.
> 
> 
> 
> If I increase the rotational speed of the wheel that would cause the hammer
> head to be traveling downward faster, thus increasing the inertial power of
> the strike.
> 
> 
> 
> Do any of you think this might help!
> 
> 
> 
> Thanks in advance!
> 
> 
> 
> Wes/William the Tinker
> 
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