Help with HF 14" x 40" lathe

Jan

""Also, what is done to reverse the single phase AC motor?""

Briefly!! The run winding and the start winding are usually connected in parallel. After the motor gets going pretty good the start winding is disconnected by a centrifical switch. By then the rotation of the motor is established and the motor continues to gain speed until the running speed is obtained.

Some other variations are used such as a capacitor connected in series with the start winding to give some phase shift which shifts the current through the start winding. This makes the motor turn one way or the other. Changing the wiring makes the current phase shift through the start winding change which makes the motor go the other direction.

Some motors have a capacitor and some don't. Some motors have a start switch and some don't. All depends on the many different schemes of the motor winding schemes. And there are plenty to go around.

Lots more to this if you would like. It would take me a while to work up much more discussion.

Bob AZ

Jan

""Also, what is done to reverse the single phase AC motor?""

Briefly!! The run winding and the start winding are usually connected in parallel. After the motor gets going pretty good the start winding is disconnected by a centrifical switch. By then the rotation of the motor is established and the motor continues to gain speed until the running speed is obtained.

Some other variations are used such as a capacitor connected in series with the start winding to give some phase shift which shifts the current through the start winding. This makes the motor turn one way or the other. Changing the wiring makes the current phase shift through the start winding change which makes the motor go the other direction.

Some motors have a capacitor and some don't. Some motors have a start switch and some don't. All depends on the many different schemes of the motor winding schemes. And there are plenty to go around.

Lots more to this if you would like. It would take me a while to work up much more discussion.

Bob AZ

Jan

This lathe has a lot more electrics then I would have expected. Without a manual, it is gonna be tough. The model number on the data plate is TD-12368. With a date of 1994. HF has discontinued this model and offers no help. Does anyone have a manual to sell or loan? Or any ideas on a source?

I bought a new lathe recently and it has relays that are controlled by switches. The relays do the actual switching. You probably have trouble in the relays and possibly the motor is incorrectly wired.

You do need to make sure all is well before energizing anything now.

Bob AZ

Compare yours to this one. Maybe you'll get lucky.

On Tue, 13 Dec 2005 22:12:11 -0800, with neither quill nor qualm, JR North quickly quoth:

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Now -there- is a statement of absolute certainty for him.

On or around 13 Dec 2005 17:28:52 -0800, jhowell297@aol,com enlightened us thusly:

accessories,

You can of course disconnect all the existing wiring and wire up a separate motor starter switch, and reversing switch if needed.

This is the route I went with the Colchester student I have here. There are

2 separate electrical switches on the student, in theory, one is electrical isolation and the other is the motor start switch for the original 3-phase motor.

This one has a single-phase motor with capacitor permanently in circuit - the connections to the motor are on a 4-way block and it's wired up to a normal motor starter box with go and stop buttons and a thermal overload cut-out. Diagrams below (fixed pitch needed)

rotation direction A | Rotation direction B | link | phase ->o------o | phase ->o1 2o 1 2 | | | | link| |link 3 link 4 | | | o------o