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Old 10-19-2019, 03:42 PM
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Default Piss Poor Timing

Here it is almost winter and I was doing a little fab on an adapter for the newly designed chimney for the wood stove in the shop and the belts on the lathe were once again slipping.

I had replaced the belts a year after I bought the lathe (2013???) and replaced them with the HF green link belts, in hopes of quieting down the lathe, and no spindle disassembly was needed as the HF belts come apart. Found later the noise was coming from the motor pulley. The PO clearly did not know how to lock down a pulley on the motor.

After that the lathe was far quieter. Then the belts would start to slip due to the seals leaking on the inside oiling up the belts and pulleys. I was fed up with this constant slipping issue so started tearing down the pulley system in order to put in new V belts, a B30 and a B33, as well as replacing the seals for the spindle.

Pics of the tear down will follow shortly. This should have been a summer job, but NO I was too busy with other crap then. Expect the seals are metric which will likely be a PITA to find.
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Old 10-20-2019, 11:02 AM
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What is the correct spindle bearing clearance for my 10" lathe?
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Last edited by milomilo; 10-20-2019 at 12:18 PM.
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Old 10-20-2019, 02:17 PM
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????? Tapered roller bearing?
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Old 10-20-2019, 07:27 PM
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????? Tapered roller bearing?
Yes it is.
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Old 10-20-2019, 08:39 PM
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tapered roller bearings like preload not clearance.
Are they grease lubed or pumped oil lubed ?
Either the lathe manufacturer or the bearing manufacturer will be able to answer your question.
The other way is to put a little preload on then run the lathe and monitor bearing temperature they should get warmer but never hot enough to make it uncomfortable to touch.
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Old 10-20-2019, 09:28 PM
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Originally Posted by terry lingle View Post
tapered roller bearings like preload not clearance.
Are they grease lubed or pumped oil lubed ?
Either the lathe manufacturer or the bearing manufacturer will be able to answer your question.
The other way is to put a little preload on then run the lathe and monitor bearing temperature they should get warmer but never hot enough to make it uncomfortable to touch.
Oil bath. Lathe manufacturer is from Taiwan and sold out. Manual says zero clearance.
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Old 10-20-2019, 10:01 PM
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just another way to say preload chris
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Old 10-21-2019, 02:59 AM
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Quote:
Originally Posted by terry lingle View Post
...The other way is to put a little preload on then run the lathe and monitor bearing temperature they should get warmer but never hot enough to make it uncomfortable to touch...
My thoughts as well.. Tapered roller bearings are actually designed to take quite a bit of preload and I have generally found over the years that precision machine tools like lathes and mills tend to run their bearings on the tight side. As long as they don't overheat you should be fine...
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Old 10-21-2019, 07:49 AM
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Quote:
Originally Posted by milomilo View Post

After that the lathe was far quieter. Then the belts would start to slip due to the seals leaking on the inside oiling up the belts and pulleys. I was fed up with this constant slipping issue so started tearing down the pulley system in order to put in new V belts, a B30 and a B33, as well as replacing the seals for the spindle.
.
The spindle seals on those bench lathes are pretty funky. I had a 12x40 very similar to yours for about 20 years.
I will be surprised if you can find anything to fit without removing the headstock and machining a recess for a seal.

Not worth it.

Tapered roller bearings work fine with grease. I would use a bit of white lithium grease for this job. The 2 holes in the top of the casting where you put oil can be used to feed grease to it.
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Old 10-21-2019, 11:54 AM
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Quote:
Originally Posted by Ironman View Post
The spindle seals on those bench lathes are pretty funky. I had a 12x40 very similar to yours for about 20 years.
I will be surprised if you can find anything to fit without removing the headstock and machining a recess for a seal.

Not worth it.

Tapered roller bearings work fine with grease over on PM. I would use a bit of white lithium grease for this job. The 2 holes in the top of the casting where you put oil can be used to feed grease to it.
I read a thread yesterday about using grease. I liked the idea, as there would be no leaks of oil. I am going out to the shop to see if it is feasible. I can do that before I put in the parts so the tapping cuttings can be cleaned out.
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