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I Forge Iron

made an ollie hammer

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ollie hammer? or oliver hammer? Or treadle hammer? i forget :)


It's got an 8lb sledge on it. My original hammer head was a 13lb, but it was really weirdly shaped and needs more work to make it usable. 


Just the couple times ive used it, i know i need to make the foot pedal longer because it forces me to be a bit unbalanced when i kick with my foot, and it's not allowing me to center my material when i hammer, allowing for mishits. But when it hits true, it really hits. 







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Yep, treadle hammer. Some people call it an Oliver, after one particular model of treadle hammer -- in other words, all Olivers are treadle hammers, but not all treadle hammers are Olivers.

I just call mine "the nodding donkey" and leave it at that. Great tool; it was a total game changer for me.

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  • 9 months later...

well, i thought id resurrect this old post as it pertains directly to this hammer. because of injury, i now have the (forced) free time to contemplate and work on this hammer.

so after a couple months of using this hammer, it was annoying me that no matter how hard id stomp my foot to get the hammer to impact the hot steel, it wasnt leaving much of a mark on the steel. my initial testing and uses were with pieces 1/4 to 3/8ths thick, so the hammer would do the job. But when i moved up above 1/2", especially 1" variety, the hammer wasnt hitting as "hard" as i thought it would. 

i monkied with the setup some more, and just couldnt, at first, figure out what was causing the softening. So, i just hung the thing up and said "meh, ill get to it later". That was back in January. Had a friend come over, and using my army tenacity and his nuclear engineering thinking, we figured out that the culprit is the springs itself. Turns out, they dont move until they have a 20+ lb load applied to them. So, they are too "weighty" (or resistant?).
i scrounged through my scrap steel, and found some old springs, but they too, have a higher load limit in the 20+ lb range.

so i thought id ask here, since i now have the free time to work on this, does anyone know where i can pick up some weak springs? ive already hit up the local hardware store, and the ones i picked up were also wound tight and would only extend half way out with a 20lb weight on them. i tried looking at some online websites that sell springs, but this is where my knowledge of choosing a spring is very lacking.

anybody have experience with finding or buying the types of springs im talking about? 

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Might sound strange, but try shortening you connection points and put both springs in the picture on linked together end to end. That should give much more weight reaction. I believe the calculation for springs constants in series is the same as electrical resistors in parallel.


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