[Steam-engine] Valve Seat, too smooth

[Ken Majeski]

Well I have done 2 valve seats. One on the 24 Minnie that I used to have and 
one on my little Case. A friend just mounted them in his Bridgeport and cut 
them with a flycutter. Same with the Valve.... I did nothing special as far 
as dressing down. Just fed plenty of cylinder oil at first. Niether caused 
any problems whatsoever and both engines run well to this day. I did look at 
the Minnie after a couple years and it was just Fine. After all.... You did 
Machine it to get it Flat.... Why Futs it up by dressing, Honing ect.... 
Other opinions may vary but this is mine....

If you decide to turn the valve be sure that one end isn't longer than the 
other. Some engines have a wider face on one end as my Little Case has. If I 
remember right the wider side goes to the rear.



Ken Majeski, Ellsworth Wis. Case Steam Engine,  Rumely Oilpulls H, F, & R. 
Website, Http://www.pressenter.com/~kmajeski/




>From: Andy glines <pioneersop96 at yahoo.com>
>Reply-To: Steam-engine mailing list 
><steam-engine at lists.stationary-engine.com>
>To: Steam-engine mailing list <steam-engine at lists.stationary-engine.com>
>Subject: Re: [Steam-engine] Valve Seat, too smooth
>Date: Mon, 9 May 2005 13:32:03 -0700 (PDT)
>
>There is a ledge on the bottom of the valve seat that
>the valve rides on and it was machined so I'm in good
>shape there.  I did notice that the surface on the
>Valve that rides on the ledge is not flat which will
>make it prone to rocking.  I need to make the edge
>flat again somehow or I think that I can simply turn
>it over and use the edge that used to be on top.
>Thanks for your input on surface finish.  I have honed
>on the seat for awhile and knocked the top off of the
>ridges left by the cutter.  I think that I will blue
>it, using the valve for a reference, to see where I am
>at.
>--- Andre' Blanchard <andre at usermail.com> wrote:
> > I do not think you can get it to smooth, I have
> > books describing large
> > stationary engines that say when you have the amount
> > of cylinder lube set
> > right the cylinder wall will get to a mirror finish
> > after running for a
> > while.  But they are running 24/7 with no chance for
> > rust to get started.
> > That said I think it unlikely you will be able to
> > measure any difference in
> > performance of the engine between just smoothing up
> > the milled surface and
> > giving it a mirror finish.  On mine little engine I
> > milled the valve face
> > and just went over it with a fine diamond hone (one
> > I new was flat) to take
> > the peaks off of the milling marks.
> > If you hone it to much by hand the finish may get
> > better but you may also
> > be making the surface less flat unless you keep
> > checking it against a
> > reference surface.
> >
> > When they milled the valve face did they square up
> > the bottom edge that the
> > valve rides on?  Or is the Huber valve made
> > differently?  On mine the valve
> > face is vertical and there is a machined ledge at
> > the bottom that the edge
> > of the valve rides on and it was worn more then the
> > valve face.  I machined
> > the bottom edge of the valve and the mating ledge on
> > the cylinder.
> > ___________
> > Andre' B.  Clear Lake, Wi.
> >
>
>
>Andy Glines
>Evansville, IN
>
>
>
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