[modeleng] Re: Stuart Triple Expansion Engine
- From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 15 Dec 2004 07:33:21 -0500
Hi Al,
I only carve out what I have to, and have left the rest of the material
undisturbed. For example, on the roller cylinders I don't plan to relieve
the area shown cored under the flanges and around the drain cock pads. If at
some point I wanted to do so, I'd do it freehand with a die grinder to make
the appearance of a cast surface.
I'm going to lag the cylinders anyway, so it doesn't matter what's under the
sheetmetal lagging, cored casting or not.
As to the valve faces, small slot drills make short work of them. Port
drilling is the same as for castings.
One technique I plan to use for the roller cylinders to get the outer wall
plan view profile correct is to bore the blank and mount it on a mandrel. I
will then put this mandrel between a set of temporary centres horizontally
on a mill table fixture, with lockscrews to hold it in a given position for
each pass. At one end I will mount a sheetmetal template of the correct
profile. I'll then mill back and forth, rotating the blank, mandrel and
template assembly after each pass, until the cylinder emerges.
Hope it works out.
Best regards, Jeff Dayman
----- Original Message -----
From: "Allen Messer" <al_messer@xxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, December 14, 2004 8:25 AM
Subject: [modeleng] Re: Stuart Triple Expansion Engine
> Jeff, do you carve your cylinders, flanges and all,
> out of the solid like Wilfried did the cylinders for
> his "Two Times Engine? If you do not, how do you
> fabricate the flanges and valve faces? I have the
> same problem in affording to feed my hobby!
>
> Al Messer
>
> --- Jeff Dayman <jeffdayman@xxxxxxxxxxxx> wrote:
>
> > Hi Lee,
> >
> > Personally I gave up on castings a while ago due to
> > the cost. I don't doubt
> > they are expensive to make and there's a limited
> > market for them, but I sure
> > can't afford them. Here in Canada I was recently
> > quoted $195 each for a
> > Stuart V10 cylinder kit (yes, just the cylinder
> > kit!)
> >
> > ($1.00 CDN roughly .45 UKP)
> >
> > So, I've switched to fabricating everything. For the
> > steam roller cylinders
> > (and a few more models in time) I bought a big bar
> > of Meehanite cast iron, 2
> > 3/4" diameter x 18" for $10 at my local metal
> > supermarket. The stuff
> > machines absolutely beautifully and being Meehanite
> > is very uniform in
> > grain. No sand to deal with either, as it's
> > continuous cast bar.
> >
> > By fabricating, there is one less obvious benefit.
> > When using an expensive
> > casting, I tiptoe around and be ultra careful
> > measuring and machining for
> > fear of ruining it. This takes time and could be all
> > for nought if there's a
> > blow hole or other defect, or I make a mistake. The
> > whole time I'm working
> > with it there's a kind of dread, which is not fun.
> >
> > With fabrication, a bit of relatively inexpensive
> > raw stock is all that's at
> > stake and it could be replaced quickly and cheaply
> > if disaster struck.
> > Because I'm aware of this, the work seems to go
> > faster and I get more done.
> >
> > Good luck, Jeff Dayman Waterloo Ontario Canada
> >
> >
> >
> > ----- Original Message -----
> > From: "Lee Grant" <leegrant@xxxxxxxxxx>
> > To: <modeleng@xxxxxxxxxxxxx>
> > Sent: Tuesday, December 14, 2004 5:36 AM
> > Subject: [modeleng] Re: Stuart Triple Expansion
> > Engine
> >
> >
> > > A correction
> > > In my last Email I said that the Bolton casting
> > set was $645.00 I have
> > just
> > > checked Ernie Winter's Site they are now $1069.60
> > That's put that project
> > on
> > > the back burner for a few more years.
> > >
> > > Lee
> > >
> > > MODEL ENGINEERING DISCUSSION LIST.
> > >
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> >
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>
>
>
>
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