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Electric motor question

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AG in IN

02-14-2003 17:46:48




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Ineed to buy a new motor for my South Bend Lathe. It has to be able to run forwards and backwards via a switch. I have been told that I need a special motor for this. Can't I wire a motor that is reversible(can be run forward OR backward) so that it will run forward AND backward via the switch? Thanks y'all, AG.(p.s. it has a 1/2 hp on it and I'm going to at least a 3/4 hp because I think 1 horse just isn't 1 horse anymore. Is this a reasonable idea?)

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Bill Oakes NY

02-17-2003 09:39:54




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
I have an old Craftsman shaper that has a 3/4 hp single speed motor on it. I put a 4-way switch between the running and starting winding. The 4-way switch reverses the starting winding in relation to the running winding and it will run in either direction just fine. Simple and cheap!



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George G

02-16-2003 07:38:48




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
You can use any reversible motor. When I bought my lathe it had a three phase motor on it. I got a single phase general purpose motor for it. I ain't never had to slam it into reverse. I don't know, Maybe I ain't running it right? To answer your other question. To change from 1/2 hp. to 3/4 hp. the two things you need to look at, are rpm and NEMA FRAME size. Assuming your motor is 1/2 hp 1725 rpm and built after 1953. It could have a NEMA FRAME #48 or a #56. Not only would the bolt pattern be different. The shaft size for a #48 frame is 1/2". Shaft size for a #56 frame is 5/8". A 3/4 hp 1725 rpm motor would have the #56 frame. It will tell you on the ID tag on the motor which frame you have.

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G Taylor

02-15-2003 18:46:02




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
Sometimes a DC motor can be found cheap. Simple to instant reverse them.



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S.Ammer

02-15-2003 16:37:58




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
Most single phase reversible motors have to come to or very near a complete stop so the starting switch will close and the motor will run in the other direction. But there was a way to get around this rather inexpensively shown in Homeshop Machinst magazine or one of it's sister publications a few years back, you might look on their web site or a public library. If you can not find any info e-mail me and I will try to locate it. hope this helps.

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Bus Driver

02-15-2003 16:05:00




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
Took time to look it up today. Grainger does have instant reverse single phase motors. My import lathe has an instant reverse single phase motor and the instant reverse is useful at times. My Grainger catalog is an older one, but a 3/4 HP instant reverse model listed is 6K880.



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W.W.

02-15-2003 05:36:16




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  

I used relays on my 1/2 hp for my elevater. of course I it stops at the bottom and top no instant reverse



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rhudson

02-14-2003 19:48:45




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
a reversable single phase motor would have to have a reverse start winding in it. so would have to be purchased that way.

a three phase motor is reversed by switching L1 and L3. nothing special about the motor, but requires a drum switch or reverse contactor.

i suspect yours is a single phase motor of either 110 or 220 volts. still you would have to have a motor with forward start and reverse start windings.

i would not reverse either without coasting to a stop.

try grainger.com for all types of supplies and a large selection of motors.

hope this helps

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John in MA

02-14-2003 19:26:40




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
You need to specify things a little. Most single phase motors like most SBs used are reversable. Not instant reversing, mind you, but they are reversable. If it's a three phase motor then I believe all are instant reversing. Now, SB did sell a drive system in the '40s that was instant-reversing, SINGLE PHASE. Not even the company knows anything about it these days, but it involved a special motor and a complicated setup of relays and electrics. That's all I know. You're up the river if you have one of these.

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Bus Driver

02-14-2003 18:23:43




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 Re: Electric motor question in reply to AG in IN, 02-14-2003 17:46:48  
Not an expert on this, but the usual single phase electric motor must coast to a stop before it can be reversed. In fact, if running at full speed, the reversing switch only causes the motor to "bump" slightly and continue in the same direction. A lathe may need instant reverse for some operations.



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Chester

02-15-2003 08:21:25




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 Re: Re: Electric motor question in reply to Bus Driver, 02-14-2003 18:23:43  
Assume your present set up does not include that reversing drum switch that most SB's came with. As stated above, most fractional HP motors are reversible, if..... .. you have access to both the START winding and the RUN winding. The leads on the Start winding need to be reversed to reverse the motor's direction. Which is what that drum switch does, and can be handled by any DPDT switch ( with center off ) that will handle 15 amps or so. Again as stated above, the motor must come to a complete stop or it will not reverse. Likely, because the centrifugally operated switch controlling the start winding is open as long as there is rotation of the armature. If you need help wiring that switch, just ask, as I have already worked it out for a SB that I have.

Chester

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jake

02-15-2003 08:59:24




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 Re: Re: Re: Electric motor question in reply to Chester, 02-15-2003 08:21:25  
If you have the 9" SB the original motor was 1/4 hp. As Chester stated by reversing the start winding is the way to change it. I had a Logan lathe that was made with a toggle switch in the motor case for reversing[double pole-double throw]but only after complete stop.



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AG in IN

02-15-2003 15:22:23




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 Re: Re: Re: Re: Electric motor question in reply to jake, 02-15-2003 08:59:24  
I have 2, one has 1/3, one is 1/2, the 1/3 doesn't have the guts to run at higher speeds.
Motors are all 110 single ph., and I don't need instant reverse, but it has to run both ways. The motors that are on them now aren't instant reverse. One lathe is 9in by 3 ft., and has the quick-change gearbox. The other is 9 in. by 4 ft., no quick change gearbox or automatic crossfeed and seems to be a bit older than the first. I passed on a 3ph. 9"by 4ft., quick chg. gearbox on SBL stand for $1000. Paid about 550/ea for the 2 I own and there was quite a bit of tooling with them. Also have a little Craftsman (Atlas) that collects dust.
I don't use the machines hard, but these machines have paid for themselves time after time just making bushings, turning shafts, and the ocassional threading job. Saved alot of trips to town. Also don't have a single loose pedal on a dozen or so older IH tractors on the farm.
Thanks for the tips, I'll see what I come up with. I really appreciate it!
Andrew Ginter

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