hammer weight is about 80lbs. diameter is about 3". Hammer and anvil are from a roller I found at the junk yard - same material. Anvil is about 30" long. Depth is about 24", back piece is about 5' tall. I should say that I am still getting the linkages to work correctly (they tend to destroy themselves due to the aluminum 80/20 I used) by slowly replacing bits and pieces as I have time :).

Thanks Kevin I appreciate the information I like your design I am planning to build one could you tell me the distance between the linages hammer side and support post side

Not sure what you mean about how it would reduce the impact to my body - the impact that I was worried about was when the hammer contacts the part - the abrupt stop... As to letting the hammer just "fall", my concern was that it wouldn't be enough force. By using my leg to drive the hammer down, I can increase the force (I think) beyond the "dead weight" of the hammer... hope that makes sense.

@@KevinBerisso By the impact on your body, I meant how you mentioned it was affecting your knees. It looks like the springs and pulleys are absorbing some of the energy, so that's why I was curious if the dead weight of the ram was greater. I know this design theoretically gives you more control over the striking force but it seems difficult to manage. The other way might be less tiring lol