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anvilfire!
Power hammer Page!
Catalog of User Built Hammers |
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 Man and Machine |
 Machine with Guards |
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| Spring pivot made from a hydraulic cylinder rear pivot and mount. Cheap, precision, has the clamp for the spring, made the top plate and drilled a spring seat bolt hole to locate the spring. also grease holes from the fitting to the wear points | |
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| The pitman arm pivot at the spring end. Again cylinder parts, again the pivot is drilled for a locater pin, and the pivot pin is grease fitting and drilled to the wear areas. Right, the ram rollers with grease fittings. | |
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| The crank to pitman. Pivot is a shoulder bolt, with a grease fitting on the pivot. The second image is the crank with pulley and bearings. Note that guard is hinged to swing away for service | |
 The Dies |
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 Large pulley / flywheel and crank uncovered. |
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SPECS:At present
Ram is 32# Crank stroke is 7", stroke of the ram at full speed is about 11" Dies are S-7 combination type. Motor was a found, without nameplate, 220vac 1 ph, and i suspect is in the 3/4 to 1 Hp. range. The photo entitled stroke adjustment is the access to the grease fittings thru the guard. I put grease fittings to feed moly grease to all moving surfaces, and have not seen any wear yet. I am in the process of reworking a bit. I went from a 1" radius on the fullering portion of the dies to a 7/8" radius per Uri Hoffi's design, and have changed to a heavier, tapered truck spring. I am adding about 12# to the ram. FredlyFX, the hammer beats a hand hammer every day. I am tuning now for max. performance. As I am a pretty good scrounger, i have about $43.00 invested in the hammer, and about that much more in the foundation. To all who have or are going to build a JYH, especially one of the crank actuated spring hammers, Please, Please install a guard on the machine top to contain the ram and spring parts if the spring breaks. The ram will exit the machine if the spring breaks on the upstroke! I have seen several JYH's with unguarded belts, cranks and springs. Please don't run this way, as the risks are too high. I will advise as to the effects of the changes. |
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