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As regards machine companies sticking with poured Babbitt bearings until rolling bearings replaced them rather than using inserts, it makes sense. ?Inserts allowed unskilled mechanics to swap out a bearing rather than have a machinist pour and scrape in a bearing. ?If the machine was in a machine shop, not much advantage, since pouring and scraping Babbitt bearings was a standard service. ?I have never heard of a babbitt bearing being line bored before but it makes sense. ?How I learned was wedging the caps, building a dam, smoking and blocking the shaft up and pouring the Babbitt, then scraping it in, shimming the cap then your done. ?Have never done it for a lathe, just power hammers. ?

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Charles

??? ??? True but not the old Chevrolet "Splash and Hope" rod bearings! Pressure feed to them came only with the 235 CID "Powerglide" motor in the 50's.?? Bill in Boulder CO USA

On 1/26/19 2:42 PM, Dave Matticks wrote:

Automotive and aircraft plain bearings also have pressurized lubrication.?

Dave?

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Sent from my T-Mobile 4G LTE Device

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-------- Original message --------

From: Bill Williams <BWMSBLDR1@...>

Date: 1/26/19 13:49 (GMT-06:00)

To: [email protected]

Subject: Re: [atlas-craftsman IO] Welcome to [email protected]

?

Robert, you pose a very interesting question here. Other than
basic conservationism on the part of customers and producers I do not
see why! But then the basic design of our lathes was done in an era when
Chevrolet still had poured babbitt connecting rod bearings! This would
be a thought for upgrading an older poured babbitt headstock with a
larger spindle, bigger through hole and trimetal insert bearings! Bill
in Boulder

On 1/26/19 11:57 AM, Robert Downs via Groups.Io wrote:

They are similar to the bearings used in most automotive and aircraft
engines except that most of those built since sometime between 1900
and 1920 have replaceable steel backed bearing halves.? Why Atlas,
South Bend and many other makers didn’t do that, I don’t know.