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Forum topic by getlostinwood posted 04-11-2011 10:21 PM 3317 views 0 times favorited 5 replies Add to Favorites Watch
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getlostinwood

224 posts in 1252 days


04-11-2011 10:21 PM

Topic tags/keywords: tablesaw question powermatic 3 phase

All right, I scored what I think was a decent deal. Paid $100.00 for a powermatic model 70, 12” table saw. If my research is right I think this was mfg’d in 1958 give or take. It came out of a shutdown portion of a molding shop.

Needs a good cleaning but thats seems to be the easy part.
The previous owner said it ran but I couldn’t power it up, power in the building was off. I figured it was worth the gamble. The motor is a 3 phase motor, my first question is, can I run this off of a static phase converter? It appears to have either the original motor or a very early motor (Baltric) 2hp which seems a little weak for this size of a saw, but going to be a huge jump from the 15 amp northern tool table saw I started with.
This will be going into my garage shop, I have 220v single phase already in the garage. Now I just need to get this thing running. Any help and advice is much appreciated as I’ve tapped out my fathers knowledge of electricity

-- The basis for optimism is shear terror


5 replies so far

View Bertha's profile

Bertha

12951 posts in 1343 days


#1 posted 04-11-2011 10:39 PM

There’s been some discussion about static versus rotary phase converters around here. It’s my understanding that you can spin it up with a static converter. Of course, another alternative is to drop a newer motor in there. They seem to be pretty motor-friendly saws. I’m very jealous of your score.

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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Minorhero

223 posts in 1255 days


#2 posted 04-12-2011 03:53 AM

100 dollars for that saw is a steal. I would be reluctant to use a static phase converter but the folks I hang out with just don’t like them much on general principle so take that for what its worth. What I would use is a variable frequency drive (VFD). The VFD I would buy will set you back 145 dollars before shipping and can be found here:
http://www.factorymation.com/s.nl/it.A/id.196/.f?sc=2&category=32

Another option is to just buy a new/used single phase motor. If you get the right deal on a used one you will be paying about the same as the VFD. A new one will of course set you back close to twice as much.

When you do clean it up one of the things you are probably going to want to do is pull the bearings on the arbor and (if you decide to keep it) the motor as well. With these old saws it is frequently the case that the bearings are original and after a few decades they get pretty crunchy.

The folks over at owwm.org will be able to walk you through any questions you have (just take plenty of pictures), and enjoy the really spiffy saw.

View getlostinwood's profile

getlostinwood

224 posts in 1252 days


#3 posted 04-12-2011 04:05 AM

I have spent the entire day brousing the forums, this is a great resource. Thanks for all the help.

-- The basis for optimism is shear terror

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getlostinwood

224 posts in 1252 days


#4 posted 04-25-2011 03:15 AM

I wanted to send a public thank you to Minorhero for connecting me to Temco. These guys are a great resource. I ordered the Temco VFD came back home a week later and installed it, just like the diagram showed. not being an electrician I personally get nervous when I have to play with anything above 110v let alone installing a 220v plug and then playing with three phase. I have to admit that I now have more invested in nuts, bolts, plugs, wire, and the vfd than the saw. Although I think I’m still way under replacement cost. Total in is $400.00 including fuel for running around. Now begins the tuneup process and then on to making sawdust.
Here is the video of the first startup

-- The basis for optimism is shear terror

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Minorhero

223 posts in 1255 days


#5 posted 04-25-2011 03:32 AM

Glad to be of help. Congradulations on getting your saw up and running! If you take proper care of that saw, change the bearings etc, it will be with you for the rest of your life. Have fun!

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