Thanx Gentlemen for the replies. Scissor jack are too big and most rack and pinion on drill presses as you raise and lower them kinda wobble sideways. I need a jack that is flat, my idea is to have something roughly the same size as my cross table base and maybe only 2 to 3 inches high with a wheel handle that can lower it and raise it. Maybe have a 1/4 steel plate cut the same size as my cross table basewhich the base would be mounted to it. Underneath the plate would be 4 screw nuts roughly 2" long spread out evenly towards the corners of this plate. This would then be lowered down over 4 vertical acme screws(2") that are attached at one end each to a flat gear (1/4 thick by 2" diam). In the center of all 4 gears would be another flat gear with a bevel gear on top of it which a horizontal rod with another bevel gear at one end and a wheel handle at the other end. This assembly would sit in a steel square base. My only problem is I researched prices for the gears and for as much as it would cost to build this I can buy a mill just about.  |