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Man, you are not going to want that little on any more. I can probably spring for shipping to my house to get it out of your way! :)

Looks like a good project for you!
 

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I've had an American Rotary 20hp ADX converter for years and never had any problems with it. Recently bought their 50hp AI package unit but other than test running haven't had a chance to get hooked up. They're worth checking out if you're looking for new.

You can also DIY a 3 phase converter but I don't have the knowledge or desire to learn how to do it.
 

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Discussion Starter · #8 ·
American Rotary is exactly the company I was looking at. Glad to here they have good units.


I have liked the 3 Phase-a-matics I have had. I still use a 15 hp one for my CNC machines
how does a phase-a- matic work? Is it a like a VFD?
Or does it just skip a phase?
 

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My Phase-a-matic is a regular rotary converter. They make them in various sizes

They also make some sort of skip a phase box but I have never looked into it or had one. It is an inferior solution
 

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Discussion Starter · #10 ·
[QUOTE="
They also make some sort of skip a phase box but I have never looked into it or had one. It is an inferior solution
[/QUOTE]

That’s what I thought. I’ll stay away from the passive units.
 

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What size is that? You were doing nice work on the smaller lathe. Are you planning something bigger than it would do? What size HP motor on the new one? I believe VFD's aren't good option for over 1HP, but haven't looked too hard.
 

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Nice work Mike you will love that one and if the wife gives you grief just respond by saying "size matters" I doubt she will argue with you lol You going to build some cannons?
 

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American Rotary sells on ebay and often runs discounts not shown on their site. Phase-A-Matic is also a good brand. Had a small one for years with no problems. You can get VFDs for high horsepower but they're pricey and don't make sense to me if you want to be able to run multiple machines. General rule of thumb for rotary phase converter is 2x the hp you want to run.
 

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Discussion Starter · #14 · (Edited)
@50Cal Indian
It’s a south bend 13 x 72
The motor is 3 phase 240V 3HP
It came with:
quick change toolpost
Turret tool post
Tail stock
Turret tail stock
Taper attachment
Collet attachment with collets
Compound rest
A ton of tooling.
It was great grandpas from the 40s. The guy said nobody in the family has known how to use it in 40 years.
The guy was all “NO LOW BALLERS I WANT $1,200.
I said no problem dude. It was just sitting there in the dust and mouse poop.

Gas Machine tool Machine Metal Engineering
 

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You stole that thing. What a great score. My brother has a 14in southbend in his garage. The only problem with his is not able to turn metric threads.
It is a great machine.
 

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That's a great package for the price Mike and it sounds like the tooling and accessories were worth the cost of the whole thing, nice score.
 

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Congrats! Nice lathe I have a SB 13” with a 60” table.
Though mine did not get the tear down and rebuild yours is getting! Want to visit PA for the a couple days??? Haha I can pay in belts of ammo!
Regarding power you have a couple options as mentioned above (rotary, static & VFD). I usually recommend rotary or VFD depending on the application and amount of 3ph you need?
Will this be the only 3ph machine? Usually space is the limiting factor for the amount of equipment you will acquire. I have my lathe and mill but dont see a need for additional 3ph motors (space being a factor). VFD “CAN” be cheaper and offer some additional advantages versus a rotary conversion. With a VFD you have the option to program and control the speed and the way the unit starts and stops. For me, I use the VFD regularly to adjust the speed of my SB lathe. On the other hand on my Bridgeport I use the mill Gear to control speed though I am still running it with a VFD.
Being you have a 3hp motor that will also effect price, a VFD will be more expensive then some of the cheaper 1-2hp units. Also dont forget space. A rotary conversion will need a spot which again may not be an issue, but good things to plan out and think about.
If you goes with a VFD I have a bunch of experience with the Lenze AC Drives and their technical support actually picks up the phone and helps free of charge. (No sitting on hold either)
Don't hesitate to reach out!!
 

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Mike, There are many ways to skin this cat. It just comes down to what is available and right price for you.

You could consider a single phase motor. You may already know each motor has a data tag. The frame and Hp are the 2 important ones. You already know Hp, so frame size is all you need. It is usually a combination of numbers and letters. It may not be economical or available, but something to consider.

If you have access to usable motors (1 single phase and 1 three phase) of adequate size you could build your own converter. I'm sure you have already came across this though.

Keep us updated it is always nice to see how someone else does it.
 
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