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Posted by Jim on April 5, 2009, 12:01 pm
show/hide quoted text
> On 4/4/2009 4:19 PM Lew Hodgett spake thus:
> > David Nebenzahl wrote:
> >> Whoops; missed that part of the post. So it does have brushes.
> > Yes.
> > Saw is a "Kung FU Machinerty" Special.
> > I bought one for $50 in the mid '80s to throw in back of car for use
> > at the boat yard.
> > If you get 2 years, consider yourself lucky.
> Sounds as if the proper replacement procedure would be, to paraphrase an
> old musical-instrument repairperson acquaintance of mine:
> 1. Remove sawblade.
> 2. Slide new saw under sawblade.
> --
> 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)
My mid size (but not old monster, such as one sees in lumber yrads!)
bench saw has a separate one HP AC induction motor hanging out the
back using the weight of the motor to tension the drive belt. The step
up ratio, is, I think, about 2.5 to 1
Motor has thermal reset; some sort of starting contacts/winding AFIK;
no capacitor. It is connected in 230 volt mode. Was fortunate to
eventually find a double pole switch which have mounted on saw base.
Fortunately never had to have that motor apart.
But just curious? Do some of those all-in-one motorized bench saws
have a brush motor (direct drive) buried under the saw deck. I guess
in that case the saw blade is mounted directly on the motor arbor?
+++++++++++++++++++++++
What you have might be a repulsion-induction motor. Alas, they were
discontinued in the mid 1950's.
And, my saw has such a motor.
Jim
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Posted by DanG on April 5, 2009, 12:44 pm
Next time you go the store, turn any table saw that costs less
than 300 upside down. They are basically a skilsaw (not
necessarily Skilsaw brand) bolted upside down in there. Yes, they
have brushes.
--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net
show/hide quoted text
> But just curious? Do some of those all-in-one motorized bench
> saws
> have a brush motor (direct drive) buried under the saw deck. I
> guess
> in that case the saw blade is mounted directly on the motor
> arbor?
>
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Posted by Ed Pawlowski on April 4, 2009, 7:14 pm
> Brushes for a *table saw motor*?
> Just goes to prove the value of advice you get from Usenet ...
Ah yes, some small saws with universal motors have brushes. Glad you were
able to learn something from Usenet today.
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Posted by notbob on April 4, 2009, 7:18 pm
show/hide quoted text
> Brushes for a *table saw motor*?
> Just goes to prove the value of advice you get from Usenet ...
I will admit ignorance of "table saw motor". Are you saying there are no
brushes in universal single phase AC motors? I'm sure Milwaukee would love
to know this.
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Posted by PeterD on April 4, 2009, 7:39 pm
On Sat, 04 Apr 2009 15:55:08 -0800, David Nebenzahl
show/hide quoted text
>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 ...
Yes, many of the 'newer' cheap ones use brushes. Not surprising at
all.
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> > David Nebenzahl wrote:
> >> Whoops; missed that part of the post. So it does have brushes.
> > Yes.
> > Saw is a "Kung FU Machinerty" Special.
> > I bought one for $50 in the mid '80s to throw in back of car for use
> > at the boat yard.
> > If you get 2 years, consider yourself lucky.
> Sounds as if the proper replacement procedure would be, to paraphrase an
> old musical-instrument repairperson acquaintance of mine:
> 1. Remove sawblade.
> 2. Slide new saw under sawblade.
> --
> 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)