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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

Bought a lathe, Logan 1875H.....


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  #21  
Old 05-02-2014, 10:03:09 PM
GarysToys GarysToys is offline
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Default Re: Bought a lathe, Logan 1875H.....

I can't believe you bought a lathe like that at a SUBWAY.

They must have used it to make sure the dough was 11 inches long.
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  #22  
Old 05-03-2014, 01:39:11 PM
1936JDB 1936JDB is offline
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Default Re: Bought a lathe, Logan 1875H.....

I printed your comment off, and showed it to the motor, but it still says three phase on the side. I'll try to convince it again tomorrow......
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  #23  
Old 05-03-2014, 01:52:41 PM
I like oldstuff I like oldstuff is offline
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Default Re: Bought a lathe, Logan 1875H.....

^ Now that's funny.
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  #24  
Old 05-03-2014, 01:56:57 PM
1936JDB 1936JDB is offline
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Default Re: Bought a lathe, Logan 1875H.....

Thanks. Glad the humor came through. Sometimes it's hard to tell peoples tone on the net.
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  #25  
Old 05-03-2014, 02:03:36 PM
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Default Re: Bought a lathe, Logan 1875H.....

A few literal and humorless people here too. Ya gotta be careful about not taking a 1/4-20 bolt or Seafoam with anything less than the utmost seriousness.
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  #26  
Old 05-03-2014, 04:30:40 PM
1936JDB 1936JDB is offline
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Default Re: Bought a lathe, Logan 1875H.....

You'd have to ask the fella that put it on there. Whomever that may be. I just figured they had one, and three phase power, so they put it on there. But as long as I have known this lathe (10 years), it has had that motor.
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  #27  
Old 05-03-2014, 10:57:37 PM
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Default Re: Bought a lathe, Logan 1875H.....

Ima dyin here!
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  #28  
Old 05-04-2014, 01:01:12 AM
1936JDB 1936JDB is offline
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Default Re: Bought a lathe, Logan 1875H.....

No wait is too long for the patient man. And yes I have. I'm afraid thought, that my last post was completely without humor. Your question of why, is for the man who did it, not the one that bought it. I was friends with both the seller, and buyer 10 years ago. I didn't know that the one fella even had a lathe, till I was asked by the other to help load it. But that day, it had a phase converter with it. After all this time, the buyer called and asked if I was interested in buying it myself. Which I was. It still has the same phase converter. Why it was converted is as big a mystery to me as you.
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  #29  
Old 05-04-2014, 11:04:36 AM
John Kendrick John Kendrick is offline
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Default Re: Bought a lathe, Logan 1875H.....

Quote:
Originally Posted by froelich View Post
Single phase motors are a royal pain around metal working. They cannot be direct reversed. A single phase motor has to completely stop turning to reverse it. Three phase motors can be reversed while running.
This is usually true, but there are instant-reversing single phase AC motors. For instance, my 1950's 9" South Bend came with one. They work by switching on the start winding in a reversed phase, while the motor is running at full speed in one direction. The reversal is so fast that it can spin a thread-back chuck right off. Scarey! And don't ask how I know that!
John Kendrick Old Cowman
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Old 05-04-2014, 11:52:40 AM
dkamp dkamp is offline
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Default Re: Bought a lathe, Logan 1875H.....

Well, regardless, if it's got a three-phase motor on it, I'd say get your paws on a VFD that'll accept single-phase input (like one of the TECO units, or an Allen-Bradley 1305 or 1336S) and put it on... totally-variable speed control will really make the machine, particularly when you're cutting tapers or facing an end!
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  #31  
Old 05-04-2014, 03:03:50 PM
John Kendrick John Kendrick is offline
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Default Re: Bought a lathe, Logan 1875H.....

I couldn't agree more about the ability to slow way down. Several years ago, I converted to a 3/4 hp. DC motor with a Minarik controller. Even in direct drive, it will slow to 30 rpm with lots of torque. Nowdays, I would go with the VFD.
Old Cowman
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