old techniques still in use?

> On Apr 30, 10:57 am, Bruce in Bangkok
>
> Wow, a quick google shows just how many bibbitt-bearing repair shops
> there are still in existence- there must be a lot of those bearings
> still in use.
>
> I have a bearing scraper, now I know what its for- never could figure
> out what that weird triangular knife was used for.
>
>
> Dave

Pouring babbitt isn't all that hard. You just need to follow a few
rules. I pour babbitt, hand scrape bearings, hand file journal caps and
quite a bit of the old techniques do a better job, IF DONE CORRECTLY,
than any machine out there. Plus there are more than a few times that
using high tech equipment wouldn't work because of the location of the
part. Or to keep the item accurate. I even ran across a weird engine a
few years ago. It had two tapered throws on the crank and I was ready to
have them ground true when I discovered that the castings for the
bearings areas were cast with a taper. Turned out that the designer had
decided that the taper held the crankshaft in position better than a
thrust bearing.

--
Steve W.
Near Cooperstown, New York

Posted by on April 30, 2008, 4:41 pm

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> spamTHIS...@yahoo.com wrote:

> > On Apr 30, 10:57 am, Bruce in Bangkok

> > Wow, a quick google shows just how many bibbitt-bearing repair shops
> > there are still in existence- there must be a lot of those bearings
> > still in use.

> > I have a bearing scraper, now I know what its for- never could figure
> > out what that weird triangular knife was used for.

> > Dave

>
> Pouring babbitt isn't all that hard. You just need to follow a few
> rules. I pour babbitt, hand scrape bearings, hand file journal caps and
> quite a bit of the old techniques do a better job, IF DONE CORRECTLY,
> than any machine out there. Plus there are more than a few times that
> using high tech equipment wouldn't work because of the location of the
> part. Or to keep the item accurate. I even ran across a weird engine a
> few years ago. It had two tapered throws on the crank and I was ready to
> have them ground true when I discovered that the castings for the
> bearings areas were cast with a taper. Turned out that the designer had
> decided that the taper held the crankshaft in position better than a
> thrust bearing.
>
> --
> Steve W.
> Near Cooperstown, New York

I have absolutely no need to do it, but it seems like the process
would be satisfying.

Dave

Posted by F. George McDuffee on April 30, 2008, 5:48 pm

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On Wed, 30 Apr 2008 16:36:12 -0400, "Steve W."

>spamTHISbrp@yahoo.com wrote:

>> On Apr 30, 10:57 am, Bruce in Bangkok
>>
>> Wow, a quick google shows just how many bibbitt-bearing repair shops
>> there are still in existence- there must be a lot of those bearings
>> still in use.
>>
>> I have a bearing scraper, now I know what its for- never could figure
>> out what that weird triangular knife was used for.
>>
>>
>> Dave

>
>Pouring babbitt isn't all that hard. You just need to follow a few
>rules. I pour babbitt, hand scrape bearings, hand file journal caps and
>quite a bit of the old techniques do a better job, IF DONE CORRECTLY,
>than any machine out there. Plus there are more than a few times that
>using high tech equipment wouldn't work because of the location of the
>part. Or to keep the item accurate. I even ran across a weird engine a
>few years ago. It had two tapered throws on the crank and I was ready to
>have them ground true when I discovered that the castings for the
>bearings areas were cast with a taper. Turned out that the designer had
>decided that the taper held the crankshaft in position better than a
>thrust bearing.

========
Anyone that has an interest in Babbitt bearings should take a
look at
http://lindsaybks.com/bks7/babb/index.html
http://lindsaybks.com/bks4/babbitt/index.html
http://lindsaybks.com/dgjp/djgbk/babbitt/index.html

I have all three books and they are a good read, even if you
never rebabbitt a bearing. Gingery's (book #3 above) is current.

Makes me glad that I can buy off the shelf ball/roller and
sintered bronze bearings in about any size I need.

However from what I have seen in the machine shops in the smaller
communities, many of the local manufacturing plants continue to
use old equipment, frequently with babbitt bearings. While new
equipment *MAY* be available, it will be imported, and the price
is such that the operation would no longer be economically viable
with new expensive machinery.

While replacement parts may be produced on cnc equipment, these
are frequently "reverse engineered" from existing worn-out parts.
In many cases, the U.S. companies that produced the equipment
years ago are no longer in business, so these machine shops are
keeping a number of small-town manufacturing operations (and thus
the town) going.

From what I could see, the "reverse engineered" parts tended to
be "blockier" in that a "machined from the solid" or weldment was
replacing a casting. Also a fair amount of flame spray/welding
and remachining. I did not notice any "chipping" to complete the
part, but some die grinder work.

Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).

Posted by Cliff on May 1, 2008, 5:14 am

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On Wed, 30 Apr 2008 10:04:04 -0700 (PDT), spamTHISbrp@yahoo.com wrote:

>I have a bearing scraper, now I know what its for- never could figure
>out what that weird triangular knife was used for.

Three-square.
Really good for deburring parts. Easy to resharpen.
Can be made from old triangular files.
--
Cliff

Posted by David Harmon on May 1, 2008, 6:07 pm

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On Thu, 01 May 2008 07:48:40 +0700 in rec.crafts.metalworking, Bruce

>At one time in Singapore carrying a "bearing scraper" was an offence.
>seems they were the preferred weapon of chinese gang members.

I have seen them molded from black plastic to foil metal detectors.

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