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Voltage conversion of an old Powermatic

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Forum topic by Zonker posted 10-27-2018 01:57 PM 514 views 0 times favorited 9 replies Add to Favorites Watch
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Zonker

78 posts in 274 days


10-27-2018 01:57 PM

I’m new to the site so forgive me if this is a repeat topic. I am looking at a powermatic 66 (or 70) coming up in an auction. The only info I have is that they’re both older battleship gray with what looks like 52” or better tables and fences. My shop is has only one 220v circuit (dedicated HVAC) and I’m unsure if I can upgrade the panel. So the Question is twofold. How difficult would it be to replace the motor of a 220v saw with a 110v unit to run it on the existing circuit? I understand I’d lose power but with my current saw (Delta TS-300) I think I’d gain in accuracy and power. Since the saws in question are in an upcoming auction, all I have to go on right now is crappy pictures off the crappy auction website. I’m trying to get a feel for what I’d be getting myself in for if they went cheap enough and I got on. Second question: If it’s a twelve inch saw, what are the drawer backs of running a 10” blade on it?

Thanks for your time.

-- Larry A. - I've made a small fortune with my woodworking. The trouble is, I started with a large fortune.


9 replies so far

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Planeman40

1420 posts in 3183 days


#1 posted 10-27-2018 03:39 PM

Go ahead and upgrade the electrical panel for 220v single phase. If there is not enough space for an additional circuit in the existing panel, a new sub-panel can be added. I bet you are going to spend about the same amount of money trying to work around the problem. One last thing. Make sure the saw you are about to buy is 220v SINGLE PHASE and not three phase. Three phase presents a whole new set of problems. And yes, you can put a 10” blade on a 12” saw, but why would you want to if you went ahead and ran that 12” saw on 220v single phase. I have a 12” table saw and, believe me, that extra two inches is handy many times.

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

View Scap's profile

Scap

78 posts in 349 days


#2 posted 10-27-2018 03:46 PM

Option 1:
If the motor is dual voltage, rewire the motor for 110v.

Option 2:
If your panel has room for another two pole breaker, it should be easy to run a 220v circuit to the new saw.

Option 3:
If motor isn’t dual voltage, and you can’t get 220v pulled over to the saw, then you’ll have to consider buying a new motor, possibly a starter, and you will also be limited on how much horsepower you’ll be able to run.

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AHuxley

874 posts in 3744 days


#3 posted 10-27-2018 10:19 PM

If you are considering a PM70 do yourself a favor and research it thoroughly it is the least loved Powermatic cabinet saw for good reason.

Both are likely to be 3ph so the motor won’t be dual voltage. Unless you find a used 120v motor and starter the money you save in the end will likely not make much sense.

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Zonker

78 posts in 274 days


#4 posted 10-28-2018 02:07 AM

Thanks everyone for the advice. I’ll let you know how things turn out.

-- Larry A. - I've made a small fortune with my woodworking. The trouble is, I started with a large fortune.

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Zonker

78 posts in 274 days


#5 posted 11-03-2018 01:47 AM

Update: It is a three phase motor, so that will have to be changed. The saw has seen some use but has real good bones. Someone painted it battleship gray but the inside still has that older Emerald green. The serial number is 166691, can anyone tell me about how old it might be?

-- Larry A. - I've made a small fortune with my woodworking. The trouble is, I started with a large fortune.

View MrUnix's profile

MrUnix

7409 posts in 2621 days


#6 posted 11-03-2018 03:31 AM

Serial number makes it a PM66 built in 1971. What motor is in it, and what is the FLA on it? If it’s the 1.5hp three phase model, you MAY be able to run it on 120v.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Zonker

78 posts in 274 days


#7 posted 11-03-2018 01:25 PM

It’s a 3 hp 3 phase Leeson. Currently trying to figure out whether I want a new motor or to go with a VFD. I need to learn more on VFD’s. I do not know what “FLA” means, can you enlighten me?

-- Larry A. - I've made a small fortune with my woodworking. The trouble is, I started with a large fortune.

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Scap

78 posts in 349 days


#8 posted 11-03-2018 01:31 PM

Full Load Amps

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Zonker

78 posts in 274 days


#9 posted 11-03-2018 10:06 PM

Thanks everyone, I got outbid, maybe next time.

-- Larry A. - I've made a small fortune with my woodworking. The trouble is, I started with a large fortune.

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