Hi John
Isnt the middle cylinder on Scotsman at a slight angle? Normally A3's have
the outer cranks at 90 and the middle at 135 degrees to each other.

Andy
----- Original Message -----
From: "John Baguley" <baggo@...>
To: <halfinchlivesteamforum@...>
Sent: Thursday, March 17, 2005 7:29 PM
Subject: [Half inch live steam forum] Flying Scotsman - some progress


>
>
> Have made a start on rebuilding the chassis.
>
> As some modifications had to be made to change from two cylinders to
> three, the opportunity was taken to make new chassis sides with the
> increased height over the horn slots to give a bit more strength to
> the frames. The steel used is 2.5mm thick (Reeves no longer stock a
> suitable width in imperial sizes) so the width of the frame stretchers
> has been reduced slightly to allow for the thicker material.(I've
> added a photo to the album showing the chassis so far).
>
> The driving wheels have been removed from the axles (fortunately they
> were only press fitted and not loctited) as they were originally
> quartered at 90 degrees for two cylinders. They will have to be set at
> 120 degrees for the new three cylinder layout. I'll also machine the
> 'scale' raised bosses around the axle and crankpin which has not been
> done.
>
> I think most of the motion work will have to be re-done due to poor
> fits and finish etc. The cylinders are particularly bad, especially
> the valve ports which are a bit of a mess. I'm hoping to salvage the
> cylinder castings by careful re-machining. There is plenty of metal
> left to re-finish the bores but this may mean making new end covers.
> The ports are going to be the biggest problem. I think the easiest way
> (apart from buying a new set of castings!) will be to machine a recess
> in the port face removing the old ports and then braze a piece of
> bronze into the recess. The ports can then be re-machined as normal.
>
> It looks as though this project is going to be a lot more work than I
> thought!
>
> I've just received the castings and drawings for 'Victoria', LBSC's
> Southern tank loco. Apparently the full size drawings are no longer
> available so I'll redraw them on Autocad. If anyone ever needs a copy
> I'll then be able to supply them with a file or a hardcopy.
>
> John
>
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