[widgitmaster]

For some time now the motor on my 13x40 lathe has Ben vibrating when turning under power.
An associate suggested replacing the capacitors, as one could be leaking?
So I dug through the Chinese manual for specifics, and found the suggested values of:

460VAC 20MF and 265VAC 150MF

After a trip to Granger, they could only match one exactly.

440VAC 20MF and 330VAC 130-158MF

After a little surgery, (gutting an access hole in the wall) I was able to splice connect longer leads to the newer capacitors. Unfortunately, the lathe's motor still hums and vibrates when powered up!

Is a new motor in order?

Widit

[Al_The_Man]

Unfortunately it seems that the R.O.C. has not mastered the art of motor design.
Their 1ph induction motors historically have a very short life, I would take the opportunity to either put on a 3ph and VFD or a DC surplus motor.
Al.

[widgitmaster]

I have a new Dayton motor which is also a 2hp 1ph 220VAC.

The wiring is very confusing, can someone please help me?
Here are the images of the motor cover plates.
Is it possible to match the new wiring to the old?

OLD:
U1
U2
V1
V2
Z1
Z2

NEW:
P1
P2
T2
T3
T4
T5
T8

[Al_The_Man]

What were the power connections on your original motor, the left and right side appear to be for either direction.
Probably either U1-Z1 or U1-V2? But for one voltage, 240v.
The new motor is dual voltage.
So if you just have the 240vac conductor pair, L1-L2 to the motor it should be straight forward to connect as per the new diagram, which shows the 240v connection on the RH side.
And the reversing details if you have to.
Al.

[Arquibaldo]

Sir:

May I respectfully make a suggestion?

If your supplier will go for it, I think you should exchange your motor for a 3-phase one
plus a 2HP phase converter.

You may have to expend a little more, but you would be in much better shape:

3-phase motors are more reliable, often smaller and have better start-up behaviour
than an equivalent 1-phase motor. They don't need capacitors, too, so they are usually
somewhat less expensive.

In fact, the higher the power, the more difficult it is to see a single-phase motor and
2HP is a somewhat large motor.

Obviously, you would also have the great advantage of being able to control the motor
speed (somewhere between 10% to 150% of the nominal speed) simply rotating
a potentiometer.

To avoid, at least initially, the cost of the phase inverter an alternative might be to
have the power company change your supply to 3-phase. Depending on your location
and company this may range from simple and inexpensive to difficult or impossible-
check it out.

Best of luck