[Steam-engine] Reworking Governor

[Andy glines]

Hi Brice, I never was to concerned about the
differences in expansion.  We use brazing all of the
time to repair cracked and broken cast iron.  I've
never heard about it popping off.  I was worried about
the wear characteristics of the brass.  If it wears
out quickly I need to find a different material.  If
need be I can probably get it built up with Inconel at
work.  Jeff Detwiler wrote and told me that his spool
had been brazed and is working well.  I will probably
procede with brazing.  As for machining a new one from
billet.  That would be much easier said than done
there is a reason that it was cast instead of
machined.  If I were to start over I would probably
fabricate it from steel then machine.  I'll try to
find a spot to post a picture.  My MSN photo sharing
space is full.
--- badams at tractors.bloomington.in.us wrote:

> Andy,
>  	I would be quite comfortable using brazing rod. 
> The 
> linear coefficient of expansion per degree
> centigrade for brass/bronze is 
> 17-22 X 10 -6, for cast iron it's 8.5-10.5 X 10 -6 
> On a 2" spool over a 
> 150 degree operating range it would seem to be a
> minor factor if the 
> brass/bronze is well attached.
>  	The major issue with building up the spool might
> be keeping it 
> from warping and cracking as you add material.  Not
> my area of expertise.
>  	It seemed to me it would be easy/fun to make a new
> spool from a 
> hunk of brass.
> Hope this helps,
> Brice
> 
> On Mon, 28 Feb 2005, Andy glines wrote:
> 
> > I had a chance to take a good look at the governor
> on
> > the Huber this weekend.  What I found didn't
> surprise
> > or upset me.  What I observed was normal wear in
> the
> > valve itself.  The the seats are slightly out of
> round
> > where the spool slid in and out for many years. 
> The
> > spokes on the spool are worn also.  My plan is to
> bore
> > the seats to true them up and the build up the
> spool
> > and turn it to match the seat.  What is the best
> way
> > to build up the spool?  I can braze it but I'm
> > concerned that the brass will not hold up well and
> I
> > will have to do the job again in short order. 
> What do
> > you think?
> >
> > =====
> > Andy Glines
> > Evansville, IN
> >
> >
> >
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=====
Andy Glines
Evansville, IN


		
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