[TheForge] Mechanical Power Hammer

[Don Sinclaire]

I ordered the plans for the =93Rusty=94 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.
=20
I am still in the collecting phase- I have about =BE of the parts for a =
20
pound hammer and about half the parts for a 40 pound hammer.  The
biggest problem is I don=92t really have the room for a power hammer in
the garage.  I just want to build stuff to see how it works. =20
=20
The Rusty hammer uses 5/8 inch rod for various shafts and pins.  For the
=93bearings=94 and rollers he recommends heavy 5/8 tubing.  I have =
checked
every type of pipe and tubing listed in Machinery=92s Handbook, in the
scrap yard and in Metals Supermarket, and I can=92t find a reasonably
close fit.  No tolerances  are mentioned in the plans, so I don=92t 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.
=20
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=92t 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.
=20
The ram will consist of a 26 inch long piece of 1 =BE  inch square cold
rolled steel in a UHMW guide assembly.  This is the only steel that I
bought new.
=20
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=92t find any 5/8 tubing today either.
=20
If you want to discuss this any further, let me know.
Don Sinclaire
Western Canadian Blacksmiths Guild
Edmonton, Alberta
=20
=20


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