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

My neighbor bought a used HF 14€? by 40€? lathe with assortment of accessories,
but no manual. Then, to make easier to move, they remove the motor. When he
hooks it up again, the motor lets all the smoke out. The motor has been rebuild
but there is another problem. With the motor disconnected, one position of the
reversing switch causes all the external circuit breakers to blow.

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?

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

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- neutral | o3 4o- neutral

This kind of motor seems to be commonplace now.

Reversing switch is a DPDT (changeover) with, for preference, and "OFF" in
the middle, so it goes FWD-OFF-REV:

wiring goes like this: (no guarantee, explicit or implied...)


motor
phase
_____________________o1 2o
| |
| o_____________|
|____o---o |
s | o______ __|
w | | | neutral
i | o3 | 4o____________
t | | | |
c | o______| | |
h o---o | |
| o__________| |
|_______________________|


Note: the switch must be rated for the starting current of the motor, not
the running current - starting current can be a lot higher.
Note 2: if you do this with a switch with no off in the middle, you can
switch from forward to reverse with the motor running, which may well be a
bad move. It's always best to let the motor stop before reversing it.

--
Austin Shackles. www.ddol-las.net my opinions are just that
Satisfying: Satisfy your inner child by eating ten tubes of Smarties
from the Little Book of Complete B***ocks by Alistair Beaton.