On 2008-03-10, Bob in Phx wrote:
my take is that it looks like the jack is about to spit out forward into the
operator. Your using friction of the 2/4's and the bottom of the jack to
hold it all together. If it was mine, I would weld up a frame over the top
of the arbor press and use the hydraulic jack to push directly down on the
arbor. Just my two cents worth... but as you have it, its fairly
dangerous....

It's all moot by now, but there is not much energy stored in this
system.

i


bob in phx.
"woodworker88" wrote in message
...
I'd just get a hydraulic shop press. You can buy them fully
assembled, as kits, or weld up one yourself. Since they directly
transmit the force from the jack to the part, they don't have as many
engineering-critical parts. Measure up a commercial unit, to get an
idea of the appropriate sizes, thicknesses, etc. of the steel channel
elements, and have a field day.