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I'm building a drill press and I'd like to be able to turn it on with a momentary switch on the handle, but sometimes I need both my hands free while it's running. Ideally, I'd use a "lockable" momentary switch if I could find one, or even build one (ideas welcome) but so far no luck. So what I have now is :

  • A wall outlet to plug the drill in ;
  • A regular on/off switch ;
  • A momentary switch (the - big - PCB type)
  • A small 3-way toggle switch (to toggle between momentary and on / off, and yes I know it sounds clumsy and somehow counterintuitive) and ;
  • A mosfet module to connect the switch(es) but I'm not sure they're of the right type / voltage, I use them in my 12V builds, should I use a different module for alternative current?

The only thing left is the diagram... How would I go and wire this ?

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    \$\begingroup\$ To latch the momentary switch you'll need a relay with a spare contact to form the latch. Have you got one? \$\endgroup\$ – Transistor May 20 '20 at 20:11
  • \$\begingroup\$ @Transistor I'm pretty sure I haven't ; can you please post a link to some info about it, like pics and specs? Thanks for your quick answer \$\endgroup\$ – yPhil May 20 '20 at 20:16
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    \$\begingroup\$ Craigslist -> actual drill press -> done. You'll spend twice as much trying to hork-a-dork it this way. Also you're playing with mains power, why do that when you don't have to? Also, when using a drill press, one hand is on the plunge bar, and the other hand is on the oil can. There's no holding a switch; to stop it just raise the plunge bar. Or a foot pedal would do. \$\endgroup\$ – Harper - Reinstate Monica May 20 '20 at 20:24
  • \$\begingroup\$ There are slide switches available with ON-OFF-MOM positions. Whether they're available for the ratings you need, I don't know. \$\endgroup\$ – The Photon May 20 '20 at 20:29
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    \$\begingroup\$ @Harper-ReinstateMonica, if you're working wood, you usually don't use an oil can. \$\endgroup\$ – The Photon May 20 '20 at 20:30
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Here's one way to do that using a 12V= relay and a foot switch.

enter image description here

The control is to be housed in a protective enclosure with a socket for the power tool and one for the foot switch.

The foot switch is to be housed in its own enclosure and located on the floor.

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