Emergency cut-off switch Jet1221

**DAL1957** · 14th June 2018, 06:51 PM

It might have been nice to have cut both the active and neutral lines but the switch only has the 2 contacts (single pole) and so can switch only one line. Electrically it would not matter if you switched one or both, either way the power is cut. It would only be important if for instance the neutral and active lines were the wrong way round (though that said you still would cut the power).

The reason I have 2 lines going into the switch was to simplify the system for connecting to. Any other way would have meant accessing the existing switch and electrics. I took a short extension cord and cut it in two, with either end retaining the original plug and socket. Then I connected it as seen in the first 2 pictures. What I am left with is effectively an extension cord with a switch in the middle - just plug the lathe into the socket and plug the plug into the power point - simple and easily removed later if I want to use it on another machine, without any modifications to the lathe.

I suppose you could always have two emergency switches in series with one at either end, and rig up some sort of beam across the lathe that you could bump stop.

David.

**BobL** · 14th June 2018, 09:18 PM

Originally Posted by DAL1957

It might have been nice to have cut both the active and neutral lines but the switch only has the 2 contacts (single pole) and so can switch only one line. Electrically it would not matter if you switched one or both, either way the power is cut. It would only be important if for instance the neutral and active lines were the wrong way round (though that said you still would cut the power).

Sure it would cut the flow of power to the machine but the machine itself would still be energised because the active is still attached to the machine. If someone were to work on that machine without disconnecting the mains plug because they assumed the machine was off then they could run into problems.

If the neutral is not attached then that also tells me it's not a "no volt "switch. It might be a latching switch which is better than nothing but it is better to use a no volt switch since that prevents machine reactivation when the power restarts after a power failure.

**Colin62** · 14th June 2018, 11:26 PM

The switch on the lathe is a no volt switch, so if you kill the power to it using the kill switch, it will isolate the lathe, and not restart it until you turn it back on manually. It will also disconnect both live and neutral, because the lathe’s switch is two pole.

**DAL1957** · 15th June 2018, 03:01 AM

The fitted Emergency Switch is a locking type, push in to lock a shut down, rotate the knob to unlock. And as mentioned above, the fitted Jet switch is the No Volt Type which will need to be turned back on after a power interruption, as well as the Emergency Switch. So a double shut off.

**Paul39** · 20th June 2018, 11:34 AM

Skew,

Computer hard drives have two magnets in them that stick to steel & cast iron so well they must be pried off.

My 20 inch swing Woodfast came with an E stop switch on a magnet which I keep on the tailstock. The aftermarket DC variable drive has on - off and speed control on the cabinet below the headstock. Too far away if things get funny while hollowing a bowl.

E stop in the photo is probably under the shavings, not much use that way.

**BobL** · 20th June 2018, 12:02 PM

Originally Posted by Paul39

E stop in the photo is probably under the shavings, not much use that way.

Looks like you could use some dust extraction?

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