Made a stand and a bolt on hydraulic downfeed
In answer to a couple of previous posters I have retrofitted numerous different sized band-saws with much the same design system as the OP has done.
The valve he used is called a metered flow control valve these have a built in check ball and bypass passage they re essentially free flow in 1 direction while having a metered flow VIA a needle valve for the other direction.
the size of the cylinder to control the rate of fall lrgly depends on the size of the band-saw and how it is mounted.
It takes the use of a small amount of math to calculate the weight of the saw head being lowered in relation to the length of the length of the lever arm to the pivot of the saw versus the area of the piston on the rod end of the cylinder using the 1st class lever principal for a cylinder mounted in the pull direction or a 2nd or 3rd class lever principal for those mounted in the push direction.
Additionally I prefer to have a small reserve reservoir feeding the neutral pressure side especially for large heavier saws requiring requiring larger diameter pistons and rods
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