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Forum topic by murphy1502 posted 621 days ago 845 views 0 times favorited 5 replies Add to Favorites Watch
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murphy1502

1 post in 622 days


621 days ago

Topic tags/keywords: table saw motor tablesaw

I have an old Rockwell table saw with a 240 v 2hp motor ( rebuilt and upgraded )
Having recently I will need to rewire the house to get the power needed
... Don’t really want to do that as it is quite involved
I was thinking about replacing the motor with a new 120v motor 1.5 or less
I would like to know if it would greatly affect the saw ..
Thank you


5 replies so far

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TopamaxSurvivor

14401 posts in 2177 days


#1 posted 621 days ago

Depends on what you are cutting. The full load current of a 1.5 hp motor can approach 20 amps. That is more than a typical 120 circuit will handle. Code book lists #10 wire and 40 circuit breaker for 1.5 hp on 120 v.

Edit: check the name plate on the motor and see what it draws amp wise. Many new motors are hp rated by locked rotor current a really only develop 1/2 that much hp under the old standard.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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dhazelton

1101 posts in 798 days


#2 posted 621 days ago

A 220 line is just two 110 legs run together. It is not an expensive undertaking.

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MonteCristo

2088 posts in 690 days


#3 posted 621 days ago

I would keep the 220V motor if possible. 1.5 HP is about all you can get out of your typical 15A 110V household circuit and it’s not reallly enough if you are working with solid woods of any real thickness.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

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toolie

1684 posts in 1130 days


#4 posted 620 days ago

with the proper blade, a 1hp motor will easily rip 8/4 oak. might be a bit of a problem with 8/4 hickory, but you can just slow the feed rate. more power isn’t always the answer. that being said, a 220v motor spreads it’s power demand over both phases of the average home’s power supply thereby better using avaialble power resources. if i had a choice between 110 and 220 for a saw’s motor, i’d go 220, especially if i had limited resources dedicated to power tools. for example, my shop is powered by a 30A subpanel, but i can still run a 3 hp unisaw (220v) and a 1.5 hp DC (also 220v), my lights and a shop vac simultaneously with no problems.

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

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Wdwerker

329 posts in 734 days


#5 posted 620 days ago

I run my 25 year old 1.5 hp 120 volt UniSaw on a 25 amp breaker , 10 gauge wire, and it does a great job even ripping 8/4 hard maple. But it does not have the power my 220v 5 hp UniSaw has.

-- Fine Custom Woodwork since 1978

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