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Forum topic by murphy1502 posted 08-05-2012 at 02:24 PM 905 views 0 times favorited 5 replies Add to Favorites Watch
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murphy1502

1 post in 758 days


08-05-2012 at 02:24 PM

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

14727 posts in 2313 days


#1 posted 08-05-2012 at 02:34 PM

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

1173 posts in 934 days


#2 posted 08-05-2012 at 02:40 PM

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

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MonteCristo

2095 posts in 825 days


#3 posted 08-05-2012 at 05:53 PM

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

1746 posts in 1266 days


#4 posted 08-06-2012 at 07:17 PM

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.

View Wdwerker's profile

Wdwerker

332 posts in 870 days


#5 posted 08-06-2012 at 07:44 PM

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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