Jet 1236 Lathe won't stay running

Re: Jet 1236 Lathe won't stay running

John C Lucas

Does it shut down after running hard or just at odd times. Is the motor hot. 2 things come to mind. Is there a themal overload on the motor. If it shuts off when its hot it may have one.

Check all connections to the motor and switch. If anynare loose it could cause that. If the switch is dirty or going bad it could be a problem

Re: Jet 1236 Lathe won't stay running

Dick Coers

Could it be mechanical? Like a sheared off key or worn out reeves drive belt or pulley? Is the motor still turning? Or is it obviously electrical?

Power Switch?

Doc Green

The power switch went bad on my Jet 10-14. I replaced it with one from a big box store.

Re: Jet 1236 Lathe won't stay running

Ray

The motor turns off immediately after starting. If I hold the on/off switch in, it keeps running until I release the switch. I checked the switch - it has continuity when it is in the on position.

that sounds like the switch

john lucas

If your up to it electrically pull the switch out. Unplug the lathe. Short across the two hot terminals, or tie them together. Ideally they should be black wires. Then plug the lathe back in. If the motor runs then it is definitely the switch.

Re: that sounds like the switch

john stegall

What John said but be sure you unplug the switch while you are working on it. Then plug it in (and John said to do that, just emphasizing it)

Re: Jet 1236 Lathe won't stay running

altizer50

Does it have a stop switch, or just on/off? If it has a stop, verify continuity when the button is not pushed.

Re: Jet 1236 Lathe won't stay running

Barry L Elder

Take the power switch off, take it apart and clean it thoroughly, let it dry and put it back on the lathe. If it is under warranty, call JET if it still won't work.

Re: Jet 1236 Lathe won't stay running

Ray

Cleaning fixed it. Lots of sawdust. I guess it keep the on button from staying in. I now here the click when I use either buttons.

Thanks for the help. Ray

Re: Jet 1236 Lathe won't stay running

John K Jordan

I've had to disassemble and clean several lathe switches because extremely dust made them quit working. While a switch is apart I lube the contacts with dielectric grease. I like to seal the switch with plastic wrap, tape, and silicone seal which will hopefully keep dust out until after I'm dead and gone.

JKJ

Re: Jet 1236 Lathe won't stay running

Ray

Spoke to soon. Back to the same problem. What is the difference in switch assembly jwl-1236-57b and jwl-1236-57c? My serial number is less than 6150922.

Looks like I need the -57b version which is no longer available.

I'd buy a generic switch instead of Jet *LINK*

Dick Coers

Around $14 for a table saw style switch on Ebay. Can't say it will bit the hole in the leg exactly, but I bet it's cheaper!

Here's another choice. http://www.ebay.com/itm/Switch-For-Router-Single-Phase-On-Off-Table-Saw-Machine-Motors-110-220-Volt-New-/282180990900?hash=item41b34c37b4:g:kM4AAOSwu4BVner1


http://www.ebay.com/itm/Large-Table-Saw-Push-Button-Switch-for-Table-Saws-SW56-1-/232095346890?hash=item3609f5f0ca:g:3pQAAOSwAuZX6SOb

Re: I'd buy a generic switch instead of Jet

mikeee12345

Harbor Freight sells a knock-off Jet Lathe, you can order new switches from Harbor Freight for that series of lathe. Not sure if the switch is the same style on your Jet Lathe as far as the mounting but it most likely will wire up the same way. The switch they use mounts into a rectangular hole punched into a flat piece of plastic that mounts to the lathe with (2) screws top and bottom of the plate.

Re: Jet 1236 Lathe won't stay running

Keith Newton

Ray, The problem is in the Stop button, which is a normally closed circuit, once the start button, which is momentary contact that energizes the coil. Once the coil closes the contacts, the power from T1 runs through the STOP, then back to a separate contact beside the coil, then through it, then down to the overload protection on however many hot legs the motor requires, then back up to the top.

If you can take the Stop button apart, look to see if there are pits or peaks on the contacts. Sometimes a little strip of folded abrasive paper will clean and flatten the contacts. Sometimes a continuity check will read good, but it still doesn't get enough power to work.

Another thing, if the motor is 220, which doesn't require a neutral to run, but if the coil is 110, a bad neutral is just too easy to overlook.

Re: Jet 1236 Lathe won't stay running

Jim Evans

I just replaced my switch and added an emergency shut off.

Re: Jet 1236 Lathe won't stay running

GaryGinMD

Good ideas. I like your switches.

Re: Jet 1236 Lathe won't stay running

Jim Evans

Thanks, one of the things I like is if the emergency switch is pushed the lathe will not restart until the switch has been recycled.

Also the switches didn't cost very much compared to a "Jet Switch"

Re: Jet 1236 Lathe won't stay running

Jim Evans

I couldn't edit my other post(s)?

Here are the switch's that I used.

New Red Sign EMT Emergency Stop Button Actuator Switch Weatherproof 660V 10A, Free Shipping - $4.88

Woodstock D4160 110-Volt Paddle Switch, New, Free Shipping - $13.38

Re: Jet 1236 Lathe won't stay running

GaryG in MD

Thanks for the switch info, Jim.

It's funny because you read my mind - I was just going to ask.

Re: Jet 1236 Lathe won't stay running

Raymond Johnson

I bought the Woodstock D4160 110-Volt Paddle Switch as suggested. Now my lathe works. I had to adjust the screw holes on the lathe but the switch fit into existing space. Thanks for the help.

Re: Jet 1236 Lathe glad it worked for you

Jim Evans

Had I not bought the push button emergency shut off first, I would have used a paddle switch instead.