![]() ![]() I also used 1/2” thick UHMW plastic for hammer guides instead of brass because it’s less expensive, and it’s great stuff to work with and your hammer will run faster. At 100 psi a 2x10 Air cylinder has 314 pounds of force, add a 75 pound hammer head and you get 389 pounds of force going up and down 3 times a second. Air hammers are very powerful machines and should be built heavy and stout. This will give you an inside diameter of 3/4 inch on all air fittings. 5 CV valve and a piston with one inch ports. If you plan to smash something big then step up to a 5. This will work well for knives and damascus billets. Most 2 X 10 Air cylinders have 1/2 “ ports but the fittings have an ID of 3/8 so a valve with 2.9 CV is more than adequate for a 75 pound hammer head. Don't waste your money on high CV valves if you don't plan on building a monster size hammer. The hammer I built is a joy to use and not too difficult to build if you have some stick welding and steel fabrication ability. I would like to start a discussion on air hammers construction and the valve schematics.
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