[Steam-engine] Pitted shaft & Babbitt bearings

[Ken Hough]

This: read below is the best idea yet. Get a new axle.
Ken

If the shaft is that corroded why not just make a new
shaft.  The second best option would be to do a skim
cut where the bearing runs.   A 1/16 of on inch should
not make a difference in the overall strenth of the
shaft.   Then repoor the the bearing.

Jeff Lund
Lund machine Works

--- Andy glines <pioneersop96 at yahoo.com> wrote:
> I don't think that leaving them alone will work this
> time.  The shaft has corroded and area about 1"+
> wide
> for the length of the bearing surface on both ends. 
> I'm thinking that rain water entered the grease cups
> and sat on the shaft.  I should feel lucky that it
> didn't pit the shaft all of the way around.  I'm
> afraid that leaving a gap in the bearing surface
> like
> this will cause the shaft to cut the bearing. 
> Several
> folks on the SEL made the same suggestion though. 
> There are a few options though.  Repair with JB and
> redo the JB it it burns (big 3" shaft will act as a
> heat sink and may prevent this).  Use a higher temp
> product.  Pour before pits are repaired, scrape
> bearing, then repair with epoxy.  Use a dummy shaft.
> 
> I could weld repair the pits but I'm steering away
> from this idea.  As usual the folks at ATIS are
> giving
> me food for thought.  Thank you.
> --- Ken Hough  <k4sb at niia.net> wrote:
> > Andy, I think you are making more of this than
> need
> > be. Don't bother 
> > filling the pits. Its not turning that fast. Get
> > some roll sandpaper and 
> > buff the axle like shoe polisher does. Go all
> around
> > it. Wrap the axle in 
> > butcher paper. Todays news paper is too flexible.
> > Oil it up with 600w
> > and lay the paper on. use some thread if it wants
> to
> > undo itself. Tin the 
> > bearing housings with some acid core solder. This
> > bonds the babbit to the 
> > housing. Support the shaft with hardwood wedges
> (not
> > deep) on the bottom 
> > and sides and dam it up. Use Babbit Right.
> > Pre heat the housing and pour the first half. Let
> > cool.  Remove the shaft 
> > and re wrap with paper. Set it in the bearing
> half.
> > Lay a very flat .005 
> > shim brass (or oiled paper works too) over the
> > cooled babbit.(this 
> > prevents the babbit from bonding with the bottom
> > babbit) Add 1/8-1/4  inch 
> > of shims. Install the top bearing half and dam it
> > up. Preheat and pour. 
> > Let cool. Dissassemble and remove the paper. The
> > pits will hold oil 
> > helping to lube it. with a dremel tool and a round
> > deburring bit create 
> > oil grooves. Reassemble. You must tin the bearing
> > caps. This really helps 
> > bond the babbit. 
> > Ken
> > 
> > 
> > 
> > 
> > 
> 
> Andy Glines
> Evansville, IN
> 
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