Building A Kinyon Style Hammer

by: William Cottrell

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I got the set of Kinyon plans from ABANA over a year ago and have spent a LOT of time studying them and the general concept for the hammer. I started scrounging materials for the hammer several months after getting the plans. First material found was 2 pcs. of 8" X 8" X .375" wall tubing. I did a lot of searching on the internet for materials, especially the air cylinder. Most everyone else had cylinders 2" X 10" on their hammers, but I found a 2.5" X 12" for the right price ($32 and it was brand new) and got it to use. Only problem with the cylinder isthat it has 3/8" ports instead of 1/2". This cuts down air flow to the cylinder and I may have to drill out or replace this cylinder in the future.

A clean design was important to me as well as being able to adjust this hammer as much as possible to allow for top tooling or things that will come up that I had not even thought about. The tubing was clean, straight, heavy and made a nice appearing frame. Later the remainder of the steel was purchased (at a good price - it was already cut and had been laying in the back of the steel places shop for several years after their customer never picked it up. If you want to build a hammer there are lots of fab. shops and steel suppliers around that have materials they will heavily discount if you look for them.

I used a piece of 9" dia. shafting for the anvil. This was found at a machine shop and was part of an old shaft that they replaced. Best of all price = free! The piece was only 26" long however and I am 6'-2" and did not want to bend over the machine in order to forge. So that meant raising the anvil somehow. I found a 5" thick base plate that measured 14' X 32' and used this. Using this heavy material added a lot to the mass of the hammer therefore giving better hammer results. This also kept the footprint of the hammer smaller than if I had used a thinner plate. A thinner base plate would have had to be larger to spread the impact and to keep the whole thing from tipping due to the top weights. I welded a 1" base plate to the frame (tubing) and used 6 A325 bolts to bolt it to the 5" base plate. I welded a 1" base plate to the anvil and bolted it to the thick base plate the same way. Now, for adjustment on the top of the hammer (to allow raising and lowering the head in 2" increments) I welded a 1" plate to the frame, and another to one end of the power head. These plates had 6 holes each side for the adjustment. Another 1" plate was welded to the other end of the power head with holes in it for the hammer guides to bolt to. The hammer itself is a chunk of 5" plate that is 6-3/4" X 11". Weight is 120# (according to the charts, to damn heavy to hold on the bathroom scales!). the piece the cylinder is attached to was made out of a chunk of tubing left over from the frame. This piece bolts to the power head.

I made the frame so it could be used as an auxiliary air receiver for the hammer. However, this will never have air put into it until I have the chance to water hydro. test the unit with water at 300 psig. If you are not a certified ASME code welder do not attempt this yourself, and then hydro the unit before using as a receiver!

All parts were tack welded up and then completely assembled. The assy. was checked for plumb and level, dimensions, and alignment of all bolt holes, etc. Then dis-assembled and welded up. All the parts were pre-heated to about 250 degrees before welding except the anvil to it's base. I pre-heated it to 400 degrees because I was not sure of the type material the shaft was. All welding was done with 7018 rod.

The hammer is made up into four primary groups that consist of: