[TheForge] Mechanical Power Hammer

Sun Jan 18 09:37:00 2004

        Don, My suggestion is to get some shelby tubing which is heavy wall,
DOM(drawn over mandrel).  The welds are superior and the weld seam is non
exhistent in the tube).  Use a lathe and make the bushings about .001-.003
oversize for oil, and about .003 to .005 oversize for grease.  If you don't
have a lathe, you could have someone do it for short money, as it doesn't
take long to run a boring bar thru a short bushing.

Ralph
----- Original Message -----
From: "Don Sinclaire" <[email protected]>
To: <[email protected]>
Sent: Saturday, January 17, 2004 10:27 PM
Subject: [TheForge] Mechanical Power Hammer

I ordered the plans for the "Rusty" power hammer from Jerry Allen last
spring, and got them promptly.  They consisted of a few pages of color
pictures and some sketches of the overall hammer, some drawings of the
details and a page of notes on materials.  No scale drawings or
anything, since he assumes you are going to use whatever junkyard
material you can find.

I am still in the collecting phase- I have about � of the parts for a 20
pound hammer and about half the parts for a 40 pound hammer.  The
biggest problem is I don't really have the room for a power hammer in
the garage.  I just want to build stuff to see how it works.

The Rusty hammer uses 5/8 inch rod for various shafts and pins.  For the
"bearings" and rollers he recommends heavy 5/8 tubing.  I have checked
every type of pipe and tubing listed in Machinery's Handbook, in the
scrap yard and in Metals Supermarket, and I can't find a reasonably
close fit.  No tolerances  are mentioned in the plans, so I don't know
if pipe that is 1/16 or 1/8 th inch oversize is acceptable or if it is
going to rattle around and perform poorly.

For the main bearings in the middle of the leaf spring, I was going to
use a 1 inch shaft and ball bearing pillow blocks, but I don't think
that is a good application for a ball bearing since it is such as small
part of a rotation.  I recently bought a couple of bronze bushings and I
will try to insert them into 1x2x4 inch steel blocks to form pillow
blocks.

The ram will consist of a 26 inch long piece of 1 �  inch square cold
rolled steel in a UHMW guide assembly.  This is the only steel that I
bought new.

In the meantime, I got distracted by all the info on fly presses, so I
built a small press.  I am just about ready to try it out.  I was out
today at the scrap yard looking for something that would serve as a
flywheel, but it was too cold and too much snow to check all the piles
for something useful.  Didn't find any 5/8 tubing today either.

If you want to discuss this any further, let me know.
Don Sinclaire
Western Canadian Blacksmiths Guild
Edmonton, Alberta

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