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Mid-West Junk Yard HammerBuilt By Brian Rognholt |
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Another shock absorber hammer. Due to limited space Brian built his hammer with a dolly so that it could be easily moved. |
Brian shortened the shock to fit the compact frame. |
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Brian calls this the MW-JYH (Mid-West Junk Yard Hammer).
Although it doesn't look very junky, the motor, drive and frame parts only cost $35 at a machinery boneyard.
The rest he bought retail for $75. The ram and anvil are built-up by arc welding 1/2 x 3-/12" bar stock (5 for the ram, 6 for the anvil).
The only design problem I saw was the counter weight on the back of the shaft. I pointed out the torsional vibration problem to Brian and he immediately realized what he had done and is going to change it. This is a great example of what you can do for yourself with a small welder and minimal shop equipment. This machine has about the same materials and is less complex than most treadle hammers and is probably easier to build! Technical Problems: When in real opperation Brian found that his machine hit much TOO soft. Some of this is typical of a shock absorber hammer. Brian has since come back and made the anvil heavier and added a heavy base plate. He says it works much better and will send new photos soon. |
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This hammer has a very compact drive system using a slack belt clutch with front pulley drive.This double reduction system produces 108 strokes per minute. |
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