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Thread: Lathe question
Started 1 month, 1 week ago by Pete Wass
I have a South Bend 10" toolroom lathe. It has a 110 Sears motor on it. While using it today I noticed that when I first fire it up, there is a vibration which goes away after a time. I also think I noticed that the spindle speed isn't very fast. Could it be that the motor has or is giving up the ghost? I don't have any way to measure the RPM's of the spindle but there seems to be very little ...
Site: Benchrest Central Forums  Benchrest Central Forums - site profile
Forum: Gunsmiths Corner  Gunsmiths Corner - forum profile
Total authors: 7 authors
Total thread posts: 16 posts
Thread activity: no new posts during last week
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Other posts in this thread:

ShadowChaser replied 1 month, 1 week ago
You have one of my favorite lathes, I spent many hours as a teenager working at one of those in my grandfather's shop... My guess is the motor is shot or possibly the belt is slipping if you don't see much difference in speeds. Does it have a hard time getting up to any respectable speed with the belt in the fastest position (on the smallest diameter step to the left) on the spindle cone ...
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Wayne Shaw replied 1 month, 1 week ago
Pete, Maybe the belt (s) are taking a "set" while they set and it takes a time to loosen up? Just a thought.
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JerrySharrett replied 1 month, 1 week ago
Quote: Originally Posted by Wayne Shaw Pete, Maybe the belt (s) are taking a "set" while they set and it takes a time to loosen up? Just a thought. Waynes response is probably the answer. When you are not using the lathe, move the belt tension lever from the left to the top or to the right. This will take the ...
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Bnhpr replied 1 month, 1 week ago
Quote: Originally Posted by Pete Wass I have a South Bend 10" toolroom lathe. It has a 110 Sears motor on it. While using it today I noticed that when I first fire it up, there is a vibration which goes away after a time. I also think I noticed that the spindle speed isn't very fast. Could it be that the motor has or is giving up the ...
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mhb replied 1 month, 1 week ago
which may sound unlikely and too simple, but which I've actually encountered on the same model lathe: check the spindle bearings to see that they are getting enough oil and are not galling/seizing. One of the South Bend 10" lathes in our shop, (which had been use for years), developed a similar problem, which I traced to the misplacement of the oil wick for the chuck-side bearing, causing the ...
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Pete Wass replied 1 month, 1 week ago
Quote: Originally Posted by mhb which may sound unlikely and too simple, but which I've actually encountered on the same model lathe: check the spindle bearings to see that they are getting enough oil and are not galling/seizing. One of the South Bend 10" lathes in our shop, (which had been use for years), developed a similar problem,...
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mhb replied 1 month, 1 week ago
It was deceptive: we oiled the spindle cups regularly, but because the wick didn't extend into the bearing gallery, the bearing wasn't getting the oil. mhb/Mike
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Pete Wass replied 1 month, 1 week ago
Quote: Originally Posted by Wayne Shaw Pete, Maybe the belt (s) are taking a "set" while they set and it takes a time to loosen up? Just a thought. I had a belt made for it several years ago. It is a braided fabric belt which appears to be tight. The belt does slip off the bottom pulley almost every time...
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ShadowChaser replied 1 month, 1 week ago
The spindle being free and getting oil should be easy to confirm, with the belt tensioner in the relaxed position, you should be able to spin the spindle freely by hand. If so, put power to it and let it run for a while and feel the tops of the spindle bearing caps, at best, they should be only warm, never hot. I trust your speed problem you wrote about in the initial post is in direct drive...
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Pete Wass replied 1 month, 1 week ago
Quote: Originally Posted by ShadowChaser The spindle being free and getting oil should be easy to confirm, with the belt tensioner in the relaxed position, you should be able to spin the spindle freely by hand. If so, put power to it and let it run for a while and feel the tops of the spindle bearing caps, at best, they should be only ...
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Top contributing authors

Name
Posts
Pete Wass
6
user's latest post:
Lathe question - Page 2 -...
Published (2009-11-13 07:52:00)
Quote: Originally Posted by Bnhpr Pete, You don't need three phase power to run a 3 phase motor. The VFD (variable frequency drive) can split the phase for you. Although.......wiring one isn't for the hobbyist. A variable speed lathe is a wonderful thing, but not practical for an occasional user. I'd call Gilman electric in Bangor and they can help you, or lead you to someone that can. Your motor can likely be repaired for...
ShadowChaser
3
user's latest post:
Lathe question
Published (2009-11-12 11:27:00)
Quote: Originally Posted by Pete Wass both the spindle and drive unit run free. I am thinking the motor might be the problem. In the past, the lathe has functioned properly. That definitely sounds like the motor is the problem... One other possibility is amount of power getting to the lathe. Lathes ar notoriously power hungry when starting up before they reach operating speed due to the mass and momentum of the cone pullies, spindle, chuck...
mhb
2
user's latest post:
Lathe question
Published (2009-11-12 09:35:00)
It was deceptive: we oiled the spindle cups regularly, but because the wick didn't extend into the bearing gallery, the bearing wasn't getting the oil. mhb/Mike
Bnhpr
2
user's latest post:
Lathe question
Published (2009-11-13 01:47:00)
Quote: Originally Posted by Pete Wass I will look into this. A friend showed me his endless belt he had made from an automotive serpentine belt. It looked good. I guess it must have been a project from a How To site. I can easily do 220 but there is no 3 phase power near where this lathe is located. The power cord is rather big for this machine and it is plugged into a socket that has nothing else plugged in. I'll see about a motor....
Wayne Shaw
1
user's latest post:
Lathe question
Published (2009-11-12 04:15:00)
Pete, Maybe the belt (s) are taking a &quot;set&quot; while they set and it takes a time to loosen up? Just a thought.
JerrySharrett
1
user's latest post:
Lathe question
Published (2009-11-12 04:34:00)
Quote: Originally Posted by Wayne Shaw Pete, Maybe the belt (s) are taking a &quot;set&quot; while they set and it takes a time to loosen up? Just a thought. Waynes response is probably the answer. When you are not using the lathe, move the belt tension lever from the left to the top or to the right. This will take the tension off the flat belt. The Vee belt will not be a problem. With a 110V single phase motor you will give some...
MilGunsmith
1
user's latest post:
Lathe question
Published (2009-11-12 13:13:00)
Go to the South Bend Forum over at www.practicalmachinist.com They have all the info on the South Bend lathes that you could ever use. There is also a gunsmith forum board there.

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