Jet Lathe: rewire 110v to 220v ?

Hi, I just bought a *barely used* Jet metal lathe from my local university. Its a model BD-1336R about fifteen years old. Its 2-hp motor is wired for 110v and I would like to rewire it for

220v. The motor has this capability according to the placards. The motor is a "Shing Lih Electric Co., Type SC-A, 2-hp, CNS, C 113, Code J". This lathe has the reversing switch that is activated by a lever on the apron that rotates a shaft to work the switch. There are no details in the user manual on rewiring for 220v.

Anyone who has done this and can lend a hand, it would be greatly appreciated. The Jet website is offline while they are rebuilding it due to a merger.



Reply to
Max Krippler
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If the motor has been constructed to use either voltage, all the changing will take place under the cover plate on the end of the motor where the wires enter it.--Remove cover plate & see if there is a diagram on the back of it.--Jerry

Reply to
Jerry Wass

I've had good luck finding the wiring chart on the inside of either the switch cover or the cover where the wires enter the motor itself on these Chinese machines.

Have a look.


Reply to

A couple of suggestions, although you might've already tried these. Contact Jet (part of WMH Tool Group now), to see if they can advise you about the voltage change.

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(it works today)

You might also want to ask Jet if your lathe was made in Taiwan or China (might need serial number for correct answer), as a Taiwan made machine will have a somewhat higher value (which isn't important until you decide you might want to sell it).

If you haven't looked, check inside the motor terminal cover (with the AC power cord unplugged) for a sticker that could have a small wiring diagram for the 120/240VAC change.

It sounds as though you've had a look inside the drum switch cover, and it didn't have any info there.

There are some old RCM posts concerning lathe drum switch wiring diagrams that you can find by using Goog Advanced Search for the rec.crafts.metalworking group. I don't know that there is anything in the archives or dropbox specifically for your model.

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There is a RCM participant named Leigh/Catruckman that is a Jet dealer, and he might be able to provide a diagram.

I would assume that a diagram would show the connections based upon wire insulation colors, so you may need to examine the motor's internal wiring more closely.

WB metalworking projects

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Reply to
Wild Bill

Good point: rewiring the motor may mean also rewiring the switch, mostly for safety.

110/220 V motors rearrange the field windings from parallel to series. In the straightforward cases, there are four wires under the plate, going to the motor, two per "coil". 110 will have the coils energized in parallel, 220 will have the two coils energized in series, netting the same 110 voltage drop per coil. An ohmmeter will tell you which wires belong to a coil. Mark the wires well, so you can put things back the way they were, if things don't work out.
Reply to
Proctologically Violated©®

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'46.txtmay be of some help Gerry :-)} London, Canada

Reply to
Gerald Miller

According to Proctologically Violated©® :

If it is a single phase motor (as the 110V setup suggests), it will almost certainly have *three* coils. Two running windings, and a starting winding. That starting winding will be in series with a capacitor and a centrifugal switch, so it will probably behave weirdly for your ohmmeter.

For 110V all three will be in parallel, with the start winding switched end for end.

For 220V, the two run windings will be in series, and one end of the start winding will be connected to the junction between the two run windings. The simplest way to reverse this configuration is to connect the other end of the start winding to one of the line connections for forward, and to the other for reverse.

Indeed so.

Good Luck, DoN.

Reply to
DoN. Nichols

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