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Posted by Charles Ping on August 21, 2006, 3:54 am
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On Mon, 21 Aug 2006 00:27:17 GMT, Peter Harrison
>Well, in a fit of madness, I bought a variable frequency inverter. These
>are easy to find and I rather thought that finding a motor would be as
>simple.
>
>Daft really but what can you do when the buying mist descends?
>
>I have spent (wasted) the last couple of hours trying to find out
>exactly what motor spec I will need. My lathe is a Myford Super7B.
>
>All I seem to have discovered is that the output shaft is 5/8ths. No
>doubt they can't be had anymore and I will not be able to fit the
>current pulley to the new motor.
>
>Can anyone tell me what the mounting dimensions are. I could go and
>measure mine but it is a bugger to move until I actually come to swap
>out the motor. I would rather not have to do it twice. In any case, I
>seem to need the actual frame size and, probably, some more modern NEMA
>equivalent.
>
>Also, it turns out there are 2-pole and 4-pole motors. What on earth is
>all that about? I was only just coming to terms with the idea of star
>and delta winding. Nobody mentions what their motor is so I assume that
>can be adjusted internally to either configuration.
>
>Can anyone help me with the appropriate motor specs? Oh, and a supplier
>or two would be nice.
>
>Pete Harrison
It's either a 1/3 or a 1/2 HP 3 phase motor with a 5/8" shaft. Late
model lathes had 1/2HP 3 phase motors. It should be foot mounted. A 2
pole motor turns at 2850rpm with 50hz and a 4 pole turns at1450rpm on
50 hz. You want a 4 pole version.
Everything else doesn't really matter since the motor mount/ platform
is adjustable in just about every direction.
An original motor would fit easily but I have fitted a modern brand
new metric framed one on a Super 7 for a friend. I had to turn a
spacer up to fit a 5/8" pulley on a 14mm shaft.
Charles
http://www.homeworkshop.org.uk
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Posted by Bob Minchin on August 21, 2006, 2:40 pm
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> On Mon, 21 Aug 2006 00:27:17 GMT, Peter Harrison
>
> >Well, in a fit of madness, I bought a variable frequency inverter. These
> >are easy to find and I rather thought that finding a motor would be as
> >simple.
> >
> >Daft really but what can you do when the buying mist descends?
> >
> >I have spent (wasted) the last couple of hours trying to find out
> >exactly what motor spec I will need. My lathe is a Myford Super7B.
> >
> >All I seem to have discovered is that the output shaft is 5/8ths. No
> >doubt they can't be had anymore and I will not be able to fit the
> >current pulley to the new motor.
> >
> >Can anyone tell me what the mounting dimensions are. I could go and
> >measure mine but it is a bugger to move until I actually come to swap
> >out the motor. I would rather not have to do it twice. In any case, I
> >seem to need the actual frame size and, probably, some more modern NEMA
> >equivalent.
> >
> >Also, it turns out there are 2-pole and 4-pole motors. What on earth is
> >all that about? I was only just coming to terms with the idea of star
> >and delta winding. Nobody mentions what their motor is so I assume that
> >can be adjusted internally to either configuration.
> >
> >Can anyone help me with the appropriate motor specs? Oh, and a supplier
> >or two would be nice.
> >
> >Pete Harrison
>
>
> It's either a 1/3 or a 1/2 HP 3 phase motor with a 5/8" shaft. Late
> model lathes had 1/2HP 3 phase motors. It should be foot mounted. A 2
> pole motor turns at 2850rpm with 50hz and a 4 pole turns at1450rpm on
> 50 hz. You want a 4 pole version.
> Everything else doesn't really matter since the motor mount/ platform
> is adjustable in just about every direction.
> An original motor would fit easily but I have fitted a modern brand
> new metric framed one on a Super 7 for a friend. I had to turn a
> spacer up to fit a 5/8" pulley on a 14mm shaft.
>
> Charles
>
> http://www.homeworkshop.org.uk
I seem to be making bushes to fit pulleys to motors quite regularly.
The technique I use is to turn the OD of a BMS rod to fit the pulley and
bore the inside to fit the motor shaft. Part off to form a short length of
tube. Turn another piece of scrap to the OD of the motor shaft and fit into
the tubular spacer.
Mill a slot along the length to the tube using the inner scrap to stop the
tube collapsing. Make the slot the same width as the keyway in the motor
shaft or very slightly wider.
If the keyway in the pulley is the same width as the motor keyway then a
simple key but deeper than standard is all you need. If as usual the pulley
keyway is wider than that of the motor then a stepped key can be made.
Hope this makes sense.
Bob
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Posted by Boring on August 21, 2006, 10:20 am
Please log in for more thread options On Mon, 21 Aug 2006 00:27:17 GMT, Peter Harrison
>Well, in a fit of madness, I bought a variable frequency inverter. These
>are easy to find and I rather thought that finding a motor would be as
>simple.
>
>Daft really but what can you do when the buying mist descends?
>
>I have spent (wasted) the last couple of hours trying to find out
>exactly what motor spec I will need. My lathe is a Myford Super7B.
>
>All I seem to have discovered is that the output shaft is 5/8ths. No
>doubt they can't be had anymore and I will not be able to fit the
>current pulley to the new motor.
>
>Can anyone tell me what the mounting dimensions are. I could go and
>measure mine but it is a bugger to move until I actually come to swap
>out the motor. I would rather not have to do it twice. In any case, I
>seem to need the actual frame size and, probably, some more modern NEMA
>equivalent.
>
>Also, it turns out there are 2-pole and 4-pole motors. What on earth is
>all that about? I was only just coming to terms with the idea of star
>and delta winding. Nobody mentions what their motor is so I assume that
>can be adjusted internally to either configuration.
>
>Can anyone help me with the appropriate motor specs? Oh, and a supplier
>or two would be nice.
>
>Pete Harrison
I fitted an inverter and three-phase motor to my S7 Plus, both
supplied by a regular contributor to this group. The new 0.5hp
three-phase motor is considerably smaller than Myford's original
noisy, overheating, vibrating, heavy single-phase monster. It was
therefore necessary to make an adapter plate (I used 3/8" aluminium
alloy) for the motor mounting, which is probably easier than hunting
for a motor with the right holes.
It was also necessary to make a spindle extension and this was done
before the old motor was removed. The original pulley is mounted on
the extension. I also made a control box to make best use of the
features in the inverter.
The result is well worth every single penny and every single minute
spent on making the alteration. You really will wonder how you ever
managed without it.
From the motor plate:
M.G.C. Systems VDE 0530/IEC34-1
3 phase M Type MA-AL71-14-4A
Nr T512/4463
0.37kW 0.5HP
(illegible character) Y 230/440V
1.98/1.14A
cos phi 0.91
1400 (-1) min (presumably rpm)
50hz
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Posted by Peter Harrison on August 21, 2006, 5:50 pm
Please log in for more thread options Boring wrote:
> On Mon, 21 Aug 2006 00:27:17 GMT, Peter Harrison
>
>> Well, in a fit of madness, I bought a variable frequency inverter. These
>> are easy to find and I rather thought that finding a motor would be as
>> simple.
>>
>> Daft really but what can you do when the buying mist descends?
>>
>> I have spent (wasted) the last couple of hours trying to find out
>> exactly what motor spec I will need. My lathe is a Myford Super7B.
>>
>> All I seem to have discovered is that the output shaft is 5/8ths. No
>> doubt they can't be had anymore and I will not be able to fit the
>> current pulley to the new motor.
>>
>> Can anyone tell me what the mounting dimensions are. I could go and
>> measure mine but it is a bugger to move until I actually come to swap
>> out the motor. I would rather not have to do it twice. In any case, I
>> seem to need the actual frame size and, probably, some more modern NEMA
>> equivalent.
>>
>> Also, it turns out there are 2-pole and 4-pole motors. What on earth is
>> all that about? I was only just coming to terms with the idea of star
>> and delta winding. Nobody mentions what their motor is so I assume that
>> can be adjusted internally to either configuration.
>>
>> Can anyone help me with the appropriate motor specs? Oh, and a supplier
>> or two would be nice.
>>
>> Pete Harrison
>
> I fitted an inverter and three-phase motor to my S7 Plus, both
> supplied by a regular contributor to this group. The new 0.5hp
> three-phase motor is considerably smaller than Myford's original
> noisy, overheating, vibrating, heavy single-phase monster. It was
> therefore necessary to make an adapter plate (I used 3/8" aluminium
> alloy) for the motor mounting, which is probably easier than hunting
> for a motor with the right holes.
>
> It was also necessary to make a spindle extension and this was done
> before the old motor was removed. The original pulley is mounted on
> the extension. I also made a control box to make best use of the
> features in the inverter.
>
> The result is well worth every single penny and every single minute
> spent on making the alteration. You really will wonder how you ever
> managed without it.
>
> From the motor plate:
>
> M.G.C. Systems VDE 0530/IEC34-1
> 3 phase M Type MA-AL71-14-4A
> Nr T512/4463
> 0.37kW 0.5HP
> (illegible character) Y 230/440V
> 1.98/1.14A
> cos phi 0.91
> 1400 (-1) min (presumably rpm)
> 50hz
>
>
Thanks all for the information.
If I had thought this through before parting with the money, I would
probably not have bothered :)
However, now I am committed...
I had a closer look at the Newton Tesla site. They appear to sell a
ready-to-go motor, used as part of their kit. I will give them a call in
the morning and see exactly how compatible their motor is. Idle that I
am, I would rather spend a few extra quid on a simple to fit replacement
than have to make up keys and bushes and whatnot. I would be sure to
discover a need for some vital part, easy to make on the lathe but with
the motor not fitted.
Pete Harrison
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Posted by Mark Rand on August 21, 2006, 7:13 pm
Please log in for more thread options wrote:
>>
>
>Thanks all for the information.
>
>If I had thought this through before parting with the money, I would
>probably not have bothered :)
>
>However, now I am committed...
>
>I had a closer look at the Newton Tesla site. They appear to sell a
>ready-to-go motor, used as part of their kit. I will give them a call in
>the morning and see exactly how compatible their motor is. Idle that I
>am, I would rather spend a few extra quid on a simple to fit replacement
>than have to make up keys and bushes and whatnot. I would be sure to
>discover a need for some vital part, easy to make on the lathe but with
>the motor not fitted.
>
>Pete Harrison
It should be noted that the nice people at Myford's will sell motor pulleys in
two diameters and for several shaft sizes.
Mark Rand
RTFM
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>are easy to find and I rather thought that finding a motor would be as
>simple.
>
>Daft really but what can you do when the buying mist descends?
>
>I have spent (wasted) the last couple of hours trying to find out
>exactly what motor spec I will need. My lathe is a Myford Super7B.
>
>All I seem to have discovered is that the output shaft is 5/8ths. No
>doubt they can't be had anymore and I will not be able to fit the
>current pulley to the new motor.
>
>Can anyone tell me what the mounting dimensions are. I could go and
>measure mine but it is a bugger to move until I actually come to swap
>out the motor. I would rather not have to do it twice. In any case, I
>seem to need the actual frame size and, probably, some more modern NEMA
>equivalent.
>
>Also, it turns out there are 2-pole and 4-pole motors. What on earth is
>all that about? I was only just coming to terms with the idea of star
>and delta winding. Nobody mentions what their motor is so I assume that
>can be adjusted internally to either configuration.
>
>Can anyone help me with the appropriate motor specs? Oh, and a supplier
>or two would be nice.
>
>Pete Harrison