lathe motor

[Tonygosc]

hello
i not a very good mood as i write this my lathe which i only had up and running for a month .Ihave hardlly turned anything ,due lack of tools and time. my lathe has stopped the electric motor is working but it doesnt seem to turning the drive wheel(if thats whats it called) i took it apart but cant see why it wont work every thing seem in place if it was a electric drill i say the bushes were worn. can anybody offer advice
tony

 

[Jenx]

Motor Shaft not turning at all Tony ? -- or is it slipping inside the drive pulley ? ( Allen Grubscrews needing a tighten ? ) .. you havent lost a 'key' out of a pulley keyway or anything ?

Drive pulley turning but belt slipping ?

If the motor is getting juice, but not turning - capacitor ? Can you check the motor's capacitor connections ?

I cant recall what lathe you have ... some of the smaller ones ( CCSL for example ) aren't overly keen to start spinning with a big heavy chuck mounted, whilst configured on the highest gearing pulley combination .. mine used to struggle with that a bit ...

Can you perhaps elaborate on the symptoms a little ? as to what is happening when you try to start up ?
Is there any movement of any description when power is applied to the motor or is there any 'hum' of any description ? or is it like its 'seized' .... ?

Any detail will help in getting a diagnosis

 

[Paul.J]

There isn't a spindle lock on it is there :?:

 

[Tonygosc]

my lathe is coronet minor

im not sure where the spindle lock is or if i even have one Paul
the motor shaft is not turning if the drive pully is the stepped groved thingy then not it took me all 10 mins to get that off and again sorry for my lack of knowledge what is a pully keyway.
i was using it turned off left it for a hour turn it back on and the motor sounds like its stuck the drive shaft isnt moving and after a few seconds i get dry acrid smoke coming from itI there appears to be no movement at all and yes there is a sort of hum . as i said before i have stripped down and i cant see why its not working nothing worn of loose it just will not turn :roll:
thank you tony[/list]

 

[CHJ]

Does the motor spin if you give the chuck a spin with your hand when you switch on?

If so suspect the starter capacitor or starter centrfugal switch and capacitor dependant on motor type.

If the latter you would have heard a significant click when it started and stopped.

 

[Argee]

From what you describe, it sounds like the motor is being physically prevented from turning. As Paul suggested earler, it could be a spindle locking (indent) pin, but I don't know enough about the model to be sure.

What you don't want is any more smoke! With the power OFF, grasp the drive coming out of the headstock (left-hand side) and see if it will turn, in either direction, even by a very small amount. If you can "rock" it fractionally, the next thing is to look for a lever or pin that may have engaged with a hole (or holes) around the shaft or pully. If you find one, withdraw it so that the shaft spins freely and note the position for future use.

If, however, the shaft turns freely with the power off, it's likely to be the capacitor, as Chas suggested. Please report what you find and we may then be able to further advise.

Ray.

 

[TEP]

Hi Tony. Doesn't sound too healthy, IME once a motor begins to emit smoke chances are the windings have burnt. If so it will mean a replacement motor. This is the guy who may be able to help. Derek Pyatt, he keeps loads of spares for these old machines.

 

[Tonygosc]

hello all the drive shaft turn freely with no power in can any pin anywhere on the shaft or anything that make obstruct its turning as said before i strip it down and cant see any visable damage , if its the capacitor switch where is located , i found what looks like a small contact switch behind the motor housing to the left of the power inlet.
thanks tony

 

[dickm]

One of the really good features of the old Coronet range was that they would take any standard foot mounting motor with the right shaft diameter. So if it is your motor burnt out, then before spending a lot on a specific Coronet motor, it might be worth asking your local motor rewind specialists for something similar. Or get one from Machine Mart.

 

[Tonygosc]

hi i looked at macine mart :shock:
the motors are not cheap and i cant figure out how tp match my motor to one offered the closest shaft diameter is 14mm mines 15mm and no meantion of a channel or grove runningf its length(2mm) and what does pole mean in relation to a motor :?
tony
hello been reading the motor label can anybody tell
what the following means
8 rise
class f NO454722R
1PH RATING STR 30MIN
50HZ ENCLDP
370 WATTS F.L AMPS B.65

OH THE VOLTAGE OS 220-240 AND THR F.L SPEED 14.20

I KIND OF FIGURED OUT WHAT HZ ARE AND WATTAGE IT THE REST THAT TOTAL THROWS ME.

 

[TEP]

Hi Tony, if your motor is the original one fitted to the lathe I believe the shaft is 5/8", don't know how close this is to 15mm.

If you can't find a used motor with shaft size to fit, try going one size bigger and get the pulley wheel bored out to fit. At least this gives you a bit more scope.

 

[Tonygosc]

hi more new on the motor front, i strip it down and put all back together.i could not find any locking pins in the shaft.
it worked but seemed a bit slow. the next time i turn it on it stuck so i turn the shaft and it rotated slowly and then i turn it fast then i heard a click and it started running normally would this be the starter capacitor or starter centrfugal switch
if so what do they look like :?: :?


tony

 

[dickm]

Sounds distinctly like capacitor to me, but others more expert may know better. If it is, the cap is the cylindrical "thingy" that is almost certainly on the outside of the main casing, in a separate housing. You should be able to get a replacement from a local rewind place, or possibly Maplin/RS.

 

[flh801978]

From what you have just described your problem lies in the centrifugal switch ..whose function is to switch the capacitor out of circuit once the motor is up to speed..It is inside the motor at the non spindle end..more than likely the contacts are arced and need dressing lightly..
The figures on your old motor are:-
full load amps ....likely to be around 1.65 amps

rpm... 1400 or so this makes it a 4 pole motor

370 watts so this is 1/2 horsepower

Ian

 

[Tonygosc]

hi thanks do you mean by dressed clean both surfaces. i think i have found the centrifugal switch
at the none spindle end next the power inlet is a single contact switch could this be it? it slides up and down on the motor shaft and has a 3 blocks of metal on it held down by springs
tony

 

[CHJ]

That's it, while your cleaning it check where the connections go, they should lead you to the capacitor.

You said earlier that you heard a click as the motor spun up, this indicates that the switch is working so you just need to check contacts are clean.
If this does not fix it then it's most likely a new capacitor needed.

Not uncommon if the motor has been stood unused for some time.

 

[flh801978]

Yes thats it just gently clean the contacts with a small piece of wet and dry paper and make sure that the contacts are closed when the motor is stationary

Ian

 

[Tonygosc]

thanks guy swill cleaning contacts tommorow
it that doesnt work it a new centrifulgal switch if i can find a replacement.
tony