John wrote:

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Two problems; actuators that push, and the leverage of turning corners.
Linkage in compression has to be three to four times as massive as
linkage in tension because of the bending force. Just how much does this
machine weigh? Not just the hammer, but the entire structure. Maybe
you'd be better off using a cam to push directly down on the wheel mount
in a sliding 'bushing', and rotating the cam with a foot pedal and a
long arm. If you have a smooth shop floor, you only need to lift the
machine about an inch to get it on the wheels. A piece of 3" round with
the axle hole drilled off center makes a cam. If you're not beefy
enough, you can still use the jack to apply twist to the axle with a
lever that bears on the ram. Something to think about, it's certainly
in the 'scrapyard' catagory.

Charly