table saw motor binding electrical smoke resistance noise jerky....how BAD

Posted by bentley on April 4, 2009, 5:14 pm

My table saw motor has gone bad. It was like the blade was binding on
something, and came to a fast stop when switched off. Then there was
significant electrical smoke I had to air out. I unplugged it for a day.
Now when I plug it in and start it it seems as if there is a series of jerky
electrical resistance spurts, accompanied by a pulsating noise. Like the
motor is firing against itself - resisting its own powered rotation by
sending quick spurts of electricity power in the wrong direction. Rough,
brief, jerky rotation.

It came with a complete manual listing all parts including a full motor, but
also has a separate exploded parts illustration of just the motor.
Unfortunately it's out of warranty. So can I suspect to replace any parts,
without having to replace the whole motor?

table saw motor binding electrical smoke resistance noise jerky....how BAD

Mastercraft 55-6886-6 10" 15A 120V 60Hz 3.0 hp max 5000 rpm no-load speed

http://www.canadiantire.ca/browse/product_detail.jsp?FOLDER%3C%3Efolder_id=2534374303523072&bmUID=1238874397130&PRODUCT%3C%3Eprd_id=845524443277381&assortment=primary&fromSearch=true

Posted by notbob on April 4, 2009, 5:29 pm

> My table saw motor has gone bad. It was like the blade was binding on
> something, and came to a fast stop when switched off. Then there was
> significant electrical smoke I had to air out. I unplugged it for a day.
> Now when I plug it in and start it it seems as if there is a series of jerky
> electrical resistance spurts, accompanied by a pulsating noise. Like the
> motor is firing against itself - resisting its own powered rotation by
> sending quick spurts of electricity power in the wrong direction. Rough,
> brief, jerky rotation.

Sounds like might be worn/bad brushes or commutator. How deep are you willing
to go to save a buck? May be best to jes replace motor.

nb

Posted by Lew Hodgett on April 4, 2009, 5:47 pm

bentley wrote:

> My table saw motor has gone bad. It was like the blade was binding
> on
> something, and came to a fast stop when switched off. Then there
> was
> significant electrical smoke I had to air out. I unplugged it for a
> day.
> Now when I plug it in and start it it seems as if there is a series
> of jerky
> electrical resistance spurts, accompanied by a pulsating noise.
> Like the
> motor is firing against itself - resisting its own powered rotation
> by
> sending quick spurts of electricity power in the wrong direction.
> Rough,
> brief, jerky rotation.

Congratulations, you get to help jump start the economy by purchasing
a replacement motor.

By the time you price out a replacement universal motor, you may find
a new saw price to be just as attractive.

Lew

Posted by David Nebenzahl on April 4, 2009, 7:55 pm

On 4/4/2009 1:29 PM notbob spake thus:

>> My table saw motor has gone bad. It was like the blade was binding on
>> something, and came to a fast stop when switched off. Then there was
>> significant electrical smoke I had to air out. I unplugged it for a day.
>> Now when I plug it in and start it it seems as if there is a series of jerky
>> electrical resistance spurts, accompanied by a pulsating noise. Like the
>> motor is firing against itself - resisting its own powered rotation by
>> sending quick spurts of electricity power in the wrong direction. Rough,
>> brief, jerky rotation.

>
> Sounds like might be worn/bad brushes or commutator. How deep are you willing
> to go to save a buck? May be best to jes replace motor.

Brushes for a *table saw motor*?

Just goes to prove the value of advice you get from Usenet ...

--
Made From Pears: Pretty good chance that the product is at least
mostly pears.
Made With Pears: Pretty good chance that pears will be detectable in
the product.
Contains Pears: One pear seed per multiple tons of product.

(with apologies to Dorothy L. Sayers)

Posted by Doug Winterburn on April 4, 2009, 7:02 pm

David Nebenzahl wrote:

> On 4/4/2009 1:29 PM notbob spake thus:
>

>>> My table saw motor has gone bad. It was like the blade was binding
>>> on something, and came to a fast stop when switched off. Then there
>>> was significant electrical smoke I had to air out. I unplugged it
>>> for a day. Now when I plug it in and start it it seems as if there is
>>> a series of jerky electrical resistance spurts, accompanied by a
>>> pulsating noise. Like the motor is firing against itself - resisting
>>> its own powered rotation by sending quick spurts of electricity power
>>> in the wrong direction. Rough, brief, jerky rotation.

>> Sounds like might be worn/bad brushes or commutator. How deep are you
>> willing
>> to go to save a buck? May be best to jes replace motor.

>
> Brushes for a *table saw motor*?
>
> Just goes to prove the value of advice you get from Usenet ...
>
>

Well, it could be a direct drive universal motor...

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