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Forum topic by prodesigner posted 07-24-2014 12:44 AM 574 views 0 times favorited 8 replies Add to Favorites Watch
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prodesigner

16 posts in 1082 days


07-24-2014 12:44 AM

Topic tags/keywords: motor power wont run tablesaw

I have a 40 year Craftsman table saw. I bought it new but it has not been worked hard for many reasons. I used it a couple of months ago and it ran fine. Sunday I wanted to cut something and out of the blue the thing would not run. The motor would only hum. There is nothing binding it up. I unplugged the power and moved the blade using the v-belt from the motor. Both the blade and motor moved freely. If I left the power on for very long it tripped the circuit breaker in the wall panel. So it is drawing a lot of power. Does anyone have any ideas what could be the issue? TIA


8 replies so far

View MrUnix's profile

MrUnix

555 posts in 886 days


#1 posted 07-24-2014 12:48 AM

Centrifugal switch or start capacitor would be my guess.. both are failry easy to check and/or fix.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View toolie's profile

toolie

1768 posts in 1315 days


#2 posted 07-26-2014 12:25 PM

agree with brad, but it sounds like an excellent reason to get that 5 hp sawstop ICS you know deep down inside you really want!

-- there's a solution to every problem.......you just have to be willing to find it.

View WhyMe's profile

WhyMe

127 posts in 248 days


#3 posted 07-26-2014 12:56 PM

I have an old Craftsman saw that did the same thing and it was the start capacitor. The cap was in the base of the motor and was shaped like a sardine can, so I had to retro fit a round cap on the outside of the motor to get it working again. The original style cap isn’t available.

View TheFridge's profile

TheFridge

900 posts in 173 days


#4 posted 07-26-2014 02:19 PM

Why me, what was the Hp and cap rating of your motor. I have a 60’s c-man motor that needs a cap.

-- "We build our workshops. Then we enjoy the fruits of our labor by laboring for more fruits." - Me

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prodesigner

16 posts in 1082 days


#5 posted 07-26-2014 03:57 PM

I had an electrical engineer friend of mine check the capacitor. He said it measured the correct amount of micro farads (sp?) whatever those are. But he does think that it is probably bad after all of these years of even very light service. He said it won’t hold a charge any longer. I do not keep the saw plugged in unless it is being used. It is about $11.00 from Sears so I am going to get one and see if works. Thanks guys

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WhyMe

127 posts in 248 days


#6 posted 07-27-2014 07:40 PM

1950’s vintage Craftsman 1/2 HP 110V motor and the new round start cap is a 124-149 MDF 110/125V.


Why me, what was the Hp and cap rating of your motor. I have a 60 s c-man motor that needs a cap.

- TheFridge


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MrUnix

555 posts in 886 days


#7 posted 07-27-2014 10:04 PM

He said it won t hold a charge any longer. I do not keep the saw plugged in unless it is being used

Not using the machine, keepiing it unplugged, etc.. won’t make it last any longer unfortunately…

Eventually, the electrolyte inside them will break down and cause the capacitor to fail. It usually manifests itself as what looks like oil leaking out from the top, or the case bulging out. They do have a limited life-span, even just sitting on the shelf.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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prodesigner

16 posts in 1082 days


#8 posted 08-10-2014 04:14 PM

The motor is a 1 hp, 3450 rpm. The cap is 216-259 MFD at 110V. Bought a new cap at a local electrical repair shop for $5.00. Turns out it wasn’t really the cap even though it was low on capacitance. It was the wire from the on/off switch to the motor. I replace the wire and left in the new cap and away it went. Thanks to all who replied. I felt you deserved the answer to my dilemma. Thanks again.

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