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Converting 1950’s Unisaw from 240 to 120

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Forum topic by RedTex posted 08-28-2019 01:20 AM 502 views 0 times favorited 6 replies Add to Favorites Watch
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RedTex

10 posts in 554 days


08-28-2019 01:20 AM

I bought an old Unisaw yesterday, and something I’ll have to do is convert it from 240 to 120. It has a 1-1.5hp motor. My garage isn’t wired for 240 at the moment. What is required to do this?

I was just doing some searching and didn’t come up with anything, so apologies if this has been asked before. Thanks


6 replies so far

View CaptainKlutz's profile

CaptainKlutz

4154 posts in 2504 days


#1 posted 08-28-2019 02:25 AM

Most of the old motors, the wiring diagram is located on name plate.
Sort of like these:

It’s a simple matter of using parallel windings for 120v, and series windings for 240v.

As I suggested in other thread, visit Vintage Machinery and register for OWWM forum site.
Many of OWWM posts are behind log in, so searches don’t find them.

Like this these:
http://www.owwm.org/viewtopic.php?f=82&t=206871
http://www.owwm.org/viewtopic.php?f=82&t=203998

Cheers!

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

View ibewjon's profile

ibewjon

2268 posts in 3803 days


#2 posted 08-28-2019 02:28 AM

Sometimes the wiring diagram is inside the wiring cover. A motor that old may not list 120, but 115 or 110 instead. But it’s all the same.

View bgood's profile

bgood

38 posts in 736 days


#3 posted 09-01-2019 04:27 AM

Does your garage have a breaker panel installed ?

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RedTex

10 posts in 554 days


#4 posted 09-01-2019 04:47 AM

I don’t have a panel in the garage. There is a motor shop in town that said they could rewire the motor for $25. I would need to unbolt it and bring it in. I’d rather spend that money and time just to do it myself, provided I don’t short it out!

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bgood

38 posts in 736 days


#5 posted 09-01-2019 04:54 AM

Just checking.
Good luck.

View CaptainKlutz's profile

CaptainKlutz

4154 posts in 2504 days


#6 posted 09-01-2019 05:25 AM

RedTex:
If you look closely at the pic above, you should notice that they use the exact same wire colors, and same wiring. Delta/Rockwell used the exact same wire colors and 120/240 wiring scheme for many DECADES.

The biggest challenge with old motors is wire colors fade towards various shades of tan/brown after 50+ years, and that makes things a little harder. Simply open the wire cover on side of motor, and look for four wire colors. If you can see which is which, then follow the above pictures. There is 99.9% chance it works as it should.
Only when wire colors are not clear, do you need to check resistance of winding’s to ensure you have right series/parallel wiring.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

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