On 06/23/2011 02:31 AM, Sebastian Kuzminsky wrote: > I'm reviving an old band saw that someone donated to our hackspace. It > looks a bit like this one, but way older and junkier, and without the girl: > > http://www.oceanmachinery.com/images/kmt-band-saw.jpg > > It has an automatic shut-off switch that triggers when the saw has cut > all the way through the workpiece, like a bottom limit switch -- it just > opens the circuit that powers the motor. > > It used to have a toggle switch on the front that would let you turn the > motor on (if the saw was up off the bottom limit switch), but that > on/off switch was dead when we got it. > > We removed the broken on/off switch and jumpered the power cable there > instead, so now whenever you plug it in to the wall outlet (and lift the > saw off the bottom limit switch), the motor turns on. > > We got the machine running and cleaned it up, and now it's time for a > new on/off switch. > > I think I want a button that latches on, can be easily unlatched by > punching it (like an e-stop button), and that unlatches automatically > when the bottom limit switch (or the fuse) opens the circuit. > > Any suggestions? > > Simple answer is to make the on/off switch down there a toggle switch. Thats how ours is done, when the saw gets down there it flips the toggle switch off, when you want to turn it back on you flip the same switch to on
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