OT FOR ELECTRICAL MOTOR GURUS

msfarmall1 · Mar 25, 2019

I have Sears table saw that centrifugal switch on motor is bad and is no longer available. My remedy was to install separate toggle switch to disconnect start capacitor once motor is turning. It seems to work really well, I just have to remember to flip switch, but is there a disadvantage to this method? That is, other than manually flipping the switch. After all, from what I understand, this is the only purpose of the centrifugal switch.
Thanks in advance!

Andy Martin · Mar 25, 2019

If you can't repair the switch then that works. Somebody will tell you about potential liability when someone else uses the saw. Doesn't bother me. A spring loaded push button like a starter switch might be handier. Flip it on, push the kicker, and let it go.

johndeere720GA · Mar 25, 2019

I was thinking of a dual position dual throw high current on-off-on toggle switch. Wire it so you flip in one way to start then flip past off to run the off to shut it down.
Something like this from McMaster Carr

hd6gtom · Mar 25, 2019

Where are you located? Transmission went out of my old sears saw. Its just sitting out in the shed. In gonna keep the table but you could have anything else off it.

Pete in Holland MI · Mar 25, 2019

Suggest a momentary switch for this, so you won't forget to turn it off.

Bob · Mar 26, 2019

Check with an electric motor shop.

There's all sorts of solid-state motor starting switches available as generic replacements for mechanical ones that are NLA.

Only issue MAY be if the motor is NOT capacitor start.

Phil9N3667 · Mar 26, 2019

Daddy's old boring bar had a centrifugal switch (called it a "mouse trap!!) that went bad when we were using it one time. We weren't able to fix it, but Daddy went and got a long flat shoelace. We wrapped it around the motor shaft where it coupled to the gearbox and "pull started" it!! Worked then and several years later, my BIL and I rebuilt/bored an engine. He couldn't believe it when I pull started the motor!!

Russ from MN · Mar 26, 2019

I have one rigged up like that, but I have a momentary contact push button switch. Kind of like starting an old tractor, turn on the switch and push the start button. I have a bench grinder that has an external load sensitive start switch, it works fine too.

showcrop · Mar 26, 2019

I can't imagine a local motor shop not being able to sub in a switch from something else. I used to get a lot of motors repaired by a local shop, and they helped me out with a few odd-ball situations. There was one very popular motor that used to wear switches out so we carried a switch for that one on each truck.

Bob · Mar 26, 2019

(quoted from post at 08:01:23 03/26/19)
I can't imagine a local motor shop not being able to sub in a switch from something else. I used to get a lot of motors repaired by a local shop, and they helped me out with a few odd-ball situations. There was one very popular motor that used to wear switches out so we carried a switch for that one on each truck.

Below is a link to the sort electronic switches I posted about.

There are many brands on-line and a local motor shop would know what is a good brand.

https://store.eurtonelectric.com/electronicstartswitches.aspx

msfarmall1 · Mar 26, 2019

I am in Enterprise, MS. Thank you for the offer and thanks to everyone who responded with advice or suggestions.

showcrop · Mar 26, 2019

(quoted from post at 06:13:14 03/26/19)

(quoted from post at 08:01:23 03/26/19)
I can't imagine a local motor shop not being able to sub in a switch from something else. I used to get a lot of motors repaired by a local shop, and they helped me out with a few odd-ball situations. There was one very popular motor that used to wear switches out so we carried a switch for that one on each truck.

Click to expand...

Below is a link to the sort electronic switches I posted about.

There are many brands on-line and a local motor shop would know what is a good brand.

https://store.eurtonelectric.com/electronicstartswitches.aspx

We also had the same motor shop install probably hundreds of Sinpac brand electronic start winding switches. Other dealers of the same equipment used to buy replacement motors by the pallet and plan on a five year life out of them. We got the Sinpacs put in and planned on 25 years from the motor. We always had the shop do them because it was a bit of a job to correctly ID the proper connections as I recall.

jeffcat · Mar 26, 2019

Other than taking it to a motor shop, Andy's momentary switch is the best
idea. Safest.

OT FOR ELECTRICAL MOTOR GURUS

msfarmall1

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Andy Martin

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johndeere720GA

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hd6gtom

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Pete in Holland MI

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Bob

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Phil9N3667

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Russ from MN

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showcrop

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Bob

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msfarmall1

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showcrop

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jeffcat

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