Myford Motors

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Myford Motors

This topic has 8 replies, 4 voices, and was last updated 23 August 2010 at 20:17 by John Stevenson 1.

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23 August 2010 at 14:26 #54620
The Merry Miller
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@themerrymiller
Hi Folk,

Can anybody throw any light on how a ML7-R lathe purchased in 1984 as brand new from Buck & Hickman came to have a 1/3 HP split phase motor fitted whereas the handbook states 1/2 HP three phase or 3/4 HP single phase (capacitor start)

The colleague I purchased this lathe was never aware of this and it has performed tirelessly since 1984.

I wasn’t even aware that Myford produced a 1/3 HP motor.

I’d put some images on of the motor and plate on this thread but I haven’t cracked the system yet.

Len P.
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23 August 2010 at 14:26 #21721
The Merry Miller
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@themerrymiller
23 August 2010 at 14:55 #54622
Les Jones 1
Participant
@lesjones1
Hi Len,

To put photo’s into a post you first have to load them to the ” My Photos” section of the website. To do this under “My Account” (Near top left of this web page.) click on “My Photos” and copy the pictures there. When the pictures are there you can use the “Insert image” button. This is the one to the left of the “You Tube” button in the blue area at the top of the “Post a reply” box This caught me out the first time as all the other forums I have used just allowed inserting a picture into the post. You could try this website for information. Lathes website If it is not giving you any problem I would leave it as it is.

Les.
23 August 2010 at 15:25 #54626
The Merry Miller
Participant
@themerrymiller
It was starting to give problems Les.

I’d completed a few jobs with it until one day recentIy switched on and It started smoking, something’s not quite right I thought .

I changed to the lower speed range and it performed OK. I still felt uneasy so I stripped the motor down to look for evidence of start windings being overloaded but nothing was visible.

Anyway I had a spare 3/4HP Brookes motor lying around as one does and I put that back on.

The lathe goes like a bomb now (not a smoke bomb I might add) throughout the complete speed range.

Thanks for your help on uploading images.

Len.
23 August 2010 at 16:18 #54628
Les Jones 1
Participant
@lesjones1
Hi Len,

When the motor was smoking did it rotate? If it did not rotate then the capacitor may have gone low in value or have increased ESR (Effective series resistance.) If it did not start then the current through the winding connected directly across the mains would be very high which could have caused the smoke. It may be worth trying a new capacitor (I will not call it a start capacitor as it is connected all the time in a split phase motor.) before scraping the motor or having it rewound.

Les.
23 August 2010 at 16:20 #54629
NJH
Participant
@njh
Hi Len

I believe the ML10 was originally fitted with a 1/3 HP motor but this was upgraded to 1/2 HP for the Speed 10.

Norman
23 August 2010 at 19:16 #54637
The Merry Miller
Participant
@themerrymiller
Les,

I honestly couldn’t remember if it was rotating before I switched off all I know was that when I removed the drive belt it went well.

Incidentally this type of split phase motor doesn’t have a start
capacitor, this is what threw me when I first stripped the motor down.
It’s the centrifugal switch that disconnects the start winding once up
to speed as normal.

Len
23 August 2010 at 20:14 #54641
Les Jones 1
Participant
@lesjones1
Hi Len,

What I was thinking of as a split phase motor was wrong. I was thinking it was the type of motor that has capacitor that is permanently connected. Sorry for error.

Les.
23 August 2010 at 20:17 #54642
John Stevenson 1
Participant
@johnstevenson1
Len, My ML7 bought new from the factory in 1969 was supplied with a 1/3 HP motor as standard, it was later they upped them to 1/2 HP.

It ran for years like that until I fitted a two speed 3 phase motor.

John S.
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