[TheForge] Re: Timken Case Hardening

[Peter Hirst]

Uhhh....  "scrap bin"?

;-)


----- Original Message ----- 
From: "Lon Humphrey" <ironcrossforge at roadrunner.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Friday, March 21, 2008 1:10 AM
Subject: Re: [TheForge] Re: Timken Case Hardening


> im a millwright and all of the stuff we change out we throw out back in a 
> large scrap bin....Fafner,link belt, fag, just to name a few off the top 
> of my head...they dont rust
>
> ----- Original Message ----- 
> From: "David E. Smucker" <davesmucker at hotmail.com>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Thursday, March 20, 2008 9:11 PM
> Subject: Re: [TheForge] Re: Timken Case Hardening
>
>
>> Lon, you maybe correct but I have never seen large bearings from 
>> stainless -- now all of the bearings I was buying where 10 inch OD and 
>> larger  -- about $ 2,000,000 worth per year.  I retired in 2000 so their 
>> maybe more stainless bearings out there than I know about but I am not 
>> sure why you would go with stainless except for high temperature 
>> applications and marine applications (salt water).  Also rod end bearings 
>> for hydraulic cylinder might call for stainless.  Where are you finding 
>> scrap stainless bearings -- it might be interesting to get my hands on 
>> some.
>>
>> Carpenter makes a series of 440C type stainless for bearing applications. 
>> They have 4 different grades, two which are high carbon and two designed 
>> for case hardening.  Here is a URL if you want to look at some of the 
>> Carpenter specs.
>>
>> http://www.cartech.com/products/wr_products_bearing_steel.html
>>
>> Dave Smucker
>>
>>
>> ----- Original Message ----- 
>> From: "Lon Humphrey" <ironcrossforge at roadrunner.com>
>> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
>> Sent: Thursday, March 20, 2008 12:06 PM
>> Subject: Re: [TheForge] Re: Timken Case Hardening
>>
>>
>>> nea...most of the bigger ones made today are some form of stainless 
>>> thats why they wont rust...only if it rusts is it 52100
>>>
>>> ----- Original Message ----- 
>>> From: "David E. Smucker" <davesmucker at hotmail.com>
>>> To: <munlaw2 at hcsmail.com>; "Sponsored by ABANA" 
>>> <theforge at mailman.qth.net>
>>> Sent: Thursday, March 20, 2008 11:50 AM
>>> Subject: Re: [TheForge] Re: Timken Case Hardening
>>>
>>>
>>>> Almost all ball bearings are 52100.  Many ball and roller bearings by 
>>>> SKF, Torrington, FAG are also 52100.  SKF and FAG may make some of 
>>>> their very large bearings using case hardening.  I would think the same 
>>>> is true for the Japanese bearing manufactures but I have no first hand 
>>>> knowledge. Timken as it turns out makes most of the steel for a wide 
>>>> range of manufacturers.  For Timken's own bearings they to the best of 
>>>> my knowledge have all been case hardened.
>>>>
>>>> That doesn't mean that the Timken bearings are not good for making 
>>>> tools, they are.  If forged down the outer layer is still high carbon 
>>>> steel unless you grind it off because the case is so deep.  The inside 
>>>> is like a 4120, very tough and strong.
>>>>
>>>> But keep in mind and this is a BIG BUT -- like all things made from 
>>>> "scrap" they may fail because of defects from the parts service life. 
>>>> For some, this is OK, but others may not want to risk it.
>>>>
>>>> Dave Smucker
>>>> ----- Original Message ----- 
>>>> From: "Ron Childers" <munlaw2 at hcsmail.com>
>>>> To: "'Sponsored by ABANA'" <theforge at mailman.qth.net>
>>>> Sent: Thursday, March 20, 2008 9:48 AM
>>>> Subject: RE: [TheForge] Re: Timken Case Hardening
>>>>
>>>>
>>>>> Some years ago I made a big knife out of an old axel bearing from a 
>>>>> semi. I
>>>>> was told it was 52100 and I tempered in oil. It chopped through a 2x4 
>>>>> and
>>>>> would still shave, so it must have been pretty good steel. Also made 
>>>>> some
>>>>> smaller blades out of car axel bearings and big ball bearings; same 
>>>>> story.
>>>>>
>>>>> It must have been dumb luck that the bearings weren't Timpkin. Which
>>>>> manufacturers use 52100 for their bearings? Machinery's Handbook must 
>>>>> have
>>>>> contacted Monmoth, Fag, or some other company for their information on
>>>>> bearing steels.
>>>>>
>>>>> Ron C
>>>>>
>>>>>
>>>>>
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