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Oil Seal and Heat Build Up

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ddickey

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#1
I replaced an oil seal. Made sure the size is correct. There is a lot of heat build up. I can not touch the spindle for more than a split second as it is so hot. Anyone ever experience this issue and if so what did you do?
 

4gsr

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#2
Did you lubricate the oil seal before installing the shaft? How fast are you running the shaft at?

What is the seal on? It should be getting some lubricant from somewhere. It don't take much lubricant, a little dab should go a long ways.
 

ddickey

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#3
Yes I put just a dab of grease.
The shaft runs at 5500 RPM.
It is on a surface grinder.
Yes it gets lube. Spindle oil.
I took the of down about .003".
Same issue.
I may try a few thou more.
 

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pdentrem

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#4
Oil not there yet? Do the bearings have too much preload? Since you did not mention playing with the bearings, oil lube seems to be the issue or the shaft is not polished smooth where the seal lip is running? Any extra drag will make heat. Pierre
 

ddickey

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#5
I did polish where the seal runs.
I did play with the preload. I did however run it with no seal and there was no heat at all.
E15 & an E14 bearing if anyone is curious.
I took another .003" off. It is now about .008" less in diameter than the specs call for. Same amount if heat.

Edit: Will some run-out cause heat? In the process of skimming off the seal area I've caused some runout. Did a quick check and looks to be approximately .0015". Although this would not explain before.
 
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4gsr

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#6
Don't use grease on the oil seal. Light machine oil only.
I highly doubt that seal will handle 5500 rpm. On high speed spindles, you generally design a dust proof retainer to work in place of a seal. A good example is the nose on a bridge port mill pr clone.

Sent from my SAMSUNG-SM-G920A using Tapatalk
 

ddickey

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#7
Interesting because I replaced what I took off, a 471231.
Maybe originally this did not have a seal then.
I'll have to look into the retainer.
Will that also keep the oil from leaking out?
 

4gsr

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#8
It may and it may not. Most SG bearings are packed with grease made for this application. Get with your bearing supplier and they may be able to get a seal for high speed spindles. Also, they should have the Koblu(sp) grease for precision bearings, too.

Sent from my SAMSUNG-SM-G920A using Tapatalk
 

ddickey

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#9
There was no grease on these and I doubt they're precision.
I ordered some felt and also some shaft seals which rotate on the shaft and push up slightly against the housing. I believe it is like a dust seal.
 

4gsr

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#10
There was no grease on these and I doubt they're precision.
I ordered some felt and also some shaft seals which rotate on the shaft and push up slightly against the housing. I believe it is like a dust seal.
That sounds like your best bet. Let us know how you make out.
 

ddickey

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#12
I will machine a new spindle today using 1144 stress proof.
This will be the seal I'll be using.
https://www.mcmaster.com/#9562k46/=19es0ol
I'll have to make the collar larger so it fits well. Originally it was .812". Will make it .950"
Also I bought one new bearing. It's an ND made in the US which I can find no info on. ID is 15 mm. OD is 35 mm.
 

kd4gij

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#13
What make is the SF grinder? A surface grinder needs high speed precision bearings rated at 5500 to produce a good finish.
 

ddickey

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#15
Spindle is complete with one new bearing and shaft seal. Runs with no heat buildup. I'll consider this project over. Next will be grinding my vise.
 
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