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Re: [Half inch live steam forum] Re: GW Saddle tank 1695   Message List  
Reply | Forward Message #458 of 1143 |
I guess the frames will be much stiffened once the running boards are in
place. Looking at the drawing for the valve gear, it all looks tightly
packed in. Is there room for a pair of eccentrics or loose eccentric and
stop collar once the inner frames have been extended ?
It takes some untangling the various (slip eccentric, full Stephenson's &
oscillating cylinder) valve gear set ups described in the articles. I
presume the 'blue print' drawings give no more detail than that shown in the
magazines though.
I'm thinking of going down the laser cut route, so it would be good to get a
feel for the original vs modified frames before shelling out on ordering
them. Were your originals to the correct (3/32") thickness ?
Regards,

Simon.

----- Original Message -----
From: david_steam <no_reply@...>
To: <halfinchlivesteamforum@...>
Sent: Monday, February 28, 2005 6:18 PM
Subject: [Half inch live steam forum] Re: GW Saddle tank 1695


>
>
> In reply to simon, my 1695 is a very long term project. I bought it
> as a rusty chassis, of dubious quality, the original had a major
> flaw, the outside frames are really too weak, mine would distort. I
> tried to relieve any stresses, it made no difference. I remade the
> outside frames from a stainless type of 2.5mm I found lying about at
> work.
> This helped, but it still seemed too weak, so I made a full length
> inside frame (out of 3mm x 25mm steel) now its a really stiff chassis.
> With hind sight there is only 1/4" of frame above the cast horns, so
> I reduced the gunmetal horn height,so I would recommend using 3mm
> steel plate ones, (this would reduce overall work)
> I also made stretchers and bolted these to the inside of the buffer
> beams, ( easier alignment and stronger too)
> The crank is simply Loctite glued together, the original had machined
> different diameter crankpins. Silver soldering is so messy to clean
> up. I will Loctite pin mine but that is really overkill.
>
> Other projects now have more importance, so I may return when time
> permits.
>
> David.
>
>
> --- In halfinchlivesteamforum@..., "Simon Thomas"
> <spt001@f...> wrote:
> > Looking through the archive photos for the group, I saw those for
> LBSC's
> > 1695 saddle tank. Has anyone any experience making this design ?
> I like
> > the look of the loco(described in English Mechanics), but would
> like to hear
> > of any errors/design flaws before comitting to metal.
> > I understand a combination of Dyak wheels and Kingette inside
> cylinders
> > looks after the most significant castings. I'm not sure what else
> is worth
> > getting as a casting in this size of model.
> > Any thoughts out there ?
> >
> >
> > Simon.
>
>
>
>
>
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Mon Feb 28, 2005 8:59 pm

spt001@...
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Message #458 of 1143 |
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I guess the frames will be much stiffened once the running boards are in place. Looking at the drawing for the valve gear, it all looks tightly packed in. Is...
Simon Thomas
spt001@...
Send Email
Feb 28, 2005
9:14 pm

My chassis had 3/32 frames of really soft steel. They would distort in 2 planes and where the horns are is major weakness. I thought about the running boards...
david_steam
Offline
Mar 1, 2005
8:46 am

As for the rigidity of the frames, why not use 3/32" thick hardened steel? If you are only going to have it laser cut anyway, it may prove to be stronger than...
Aaron Gonthier
n1jib
Offline Send Email
Mar 3, 2005
7:30 pm
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