[SEL] Babbitt lapping compound
Judge Tommy Turner
lcjudge at scrtc.com
Sat Apr 5 15:05:49 PDT 2008
Carl,
Two ways to do it. One is to simply put the caps in the mill and
mill a straight groove with the edge of the endmill parallel to the
jounal. The other is simply to take a die grinder with a carbide
tipped cutter and "X" from the oil hole. I usually mill the groove as
it takes about 5 minutes to set it up and mill it. I never put it very
deep, probably 1/32 of an inch or so. Just enough that the oil can seep
into the groove and make contact with the bearing surface.
Tommy Turner
Magnolia, KY
Carl McGhee wrote:
>Thanks Tommy for your tip on doing bearings, I like it. How do you do your
>oil grooves in the bushing?
>
>Carl McGhee
>Battle Creek Mi.
>----- Original Message -----
>From: "Judge Tommy Turner" <lcjudge at scrtc.com>
>To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
>Sent: Thursday, April 03, 2008 7:36 PM
>Subject: Re: [SEL] Babbitt lapping compound
>
>
>
>
>>Guys, I do bearings the lazy way. I polish the crankshaft until its
>>bright. Then I make a bronze bushing about 1/8 thick that has about 5
>>thousandths clearance (sometimes you can get lucky and buy these from
>>McMaster Carr and other suppliers). I then split the bushing in 2
>>halves. I tin the back side with solder and then put the 2 halves back
>>on the crankshaft and wrap a very fine brass wire around them to hold
>>them in place. Then I'll situate and align the crank in the journals
>>with screw jacks dam up the ends and throw with Babbittrite. I usually
>>do a little preheat on the base and then I pour the bottom half, let it
>>cool, place my shims (usually I'll make these out of gasket material or
>>oiled paper) set the cap on, dam it up and pour the top half. I've done
>>this with several engines and never had a problem. It leaves a perfect
>>bearing surface and there isn't any scraping or fitting needed. Now if
>>someone wants the fun and experience of a babbitt/scrape job, they'll
>>want to pour the babbitt and spend a day scraping and fitting. I
>>usually just want a good bearing job.
>>
>>Tommy Turner
>>Magnolia, KY
>>
>>Rob Skinner wrote:
>>
>>
>>
>>>On Apr 3, 2008, at 9:28 AM, William Young wrote:
>>>
>>>
>>>
>>>
>>>>Answer: I think scraping takes skill & experience, neither of which
>>>>I have.
>>>>
>>>>
>>>>
>>>>
>>>Skill? Experience? Trust me, Wakai-san, neither of those are required.
>>>
>>>JB suggests using an old piston ring. He knows a thing or two about
>>>engines, so listen when he types. I've used an old hacksaw blade, but
>>>you can use any hunk of metal that you can sharpen into a shap
>>>convenient for scraping.
>>>
>>>The babbitt doesn't cut so easily that you have to worry about
>>>accidentally ruining the job if you hiccup. If you're capable of
>>>shaving your face without ending up with a sink full of blood, you can
>>>shave babbitt.
>>>
>>>I've been working out of the same quart of Starrett layout dye that
>>>I've had for the last 25 years, but you can probaby substitute any
>>>kind of coloring that will transfer between the surfaces.
>>>
>>>Party on,
>>>ロブスキナー
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>_______________________________________________
>>>SEL mailing list
>>>SEL at lists.stationary-engine.com
>>>http://www.stationary-engine.com/mailman/listinfo/sel
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>_______________________________________________
>>SEL mailing list
>>SEL at lists.stationary-engine.com
>>http://www.stationary-engine.com/mailman/listinfo/sel
>>
>>
>>
>
>_______________________________________________
>SEL mailing list
>SEL at lists.stationary-engine.com
>http://www.stationary-engine.com/mailman/listinfo/sel
>
>
>
>
>
More information about the sel
mailing list