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Old 5th February 2010, 12:08 PM   #1
dod996 is offline dod996  United States
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Default Turntable bearing question

I am considering making a few Teres style bearings from 360 brass and 440c stainless steel that has been heat treated to a very high hardness.
Would this be a good material selection? Does anyone know what the original
parts were made from?

Thanks

Tony
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Old 8th February 2010, 01:05 PM   #2
dod996 is offline dod996  United States
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Ok, I can't seem to find out what the original Teres bearing was made of. I'm reluctant to use 304 stainless because it will guald and seize so easily. I'm going to run 10 spindles from 440 stainless and have them heat treated. After heat treating I'm going to hard turn the ball bearing bore then grind the spindle all over so everything will be concentric within .0001.

Tony
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Old 8th February 2010, 08:50 PM   #3
Nanook is offline Nanook  Canada
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Default very cool....

let me know what you would consider a sa selling price. PM me
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Old 10th February 2010, 09:36 AM   #4
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Quote:
Originally Posted by dod996 View Post
Ok, I can't seem to find out what the original Teres bearing was made of. I'm reluctant to use 304 stainless because it will guald and seize so easily. I'm going to run 10 spindles from 440 stainless and have them heat treated. After heat treating I'm going to hard turn the ball bearing bore then grind the spindle all over so everything will be concentric within .0001.

Tony
I don't think it's necessary to heat treatment for the spindle but if you can do, it's great. What you gonna do with the housing? will you use only oil bath or additional bushing?
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Old 10th February 2010, 11:38 AM   #5
dod996 is offline dod996  United States
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I will make it like the original from brass using an oil bath.
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Old 10th February 2010, 11:41 AM   #6
dod996 is offline dod996  United States
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Also heat treatment will allow the spindle to hold a better finish for the life of the bearing.
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Old 11th February 2010, 02:56 AM   #7
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Default Bearings

Tony,

I am learning to machine and I am quite interested in your processes. Would you be willing to communicate via emails so I can ask questions that will not monopolize the forum?

Rick Kernell
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Old 24th May 2010, 02:35 PM   #8
dod996 is offline dod996  United States
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Default Bearing finally finished

I Just finished these bearings. I used 440 stainless steal heat treated to Rocwell 60 C then ground the diameter and ball bearing bore.


BEARING-1.jpg
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Old 24th May 2010, 03:40 PM   #9
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Very impressive!!

Some things to consider:
1. What have you used for a thrust plate?
2. How does it feel when fitting together?
3. Teres takes a few hours for the spindle to settle on the thrust plate due to oil seeping up. Might be worth doing a test on that for your own info. Add a weight on top to help coax it down.


Well done - I've seen so many attempts to do exactly this but none as determined and complete as this.

I'm sure many would be interested in taking one off your hands. What kind of price would you want if you decide to sell some?


Fran
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Old 24th May 2010, 03:52 PM   #10
dod996 is offline dod996  United States
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1. Iím using black Delrin for the thrust plate
2. It feels very smooth when fitted
3. If you apply some oil to the surface you can push them together. It does take a while for the air to escape but there no chance of the spindle seizing like 304 S.S. because it is hardened.

I did make a few extras. Would 250.00 be a fair price?
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