Tom Mallard’s Workbench L&B in 7mm scale, CR 828 in 7mm, GWR Saints in 4mm

C

COEUR-DE-LION

New Member
What some exquisite workmanship Tom, the small details and complicated Joy valve gear are really superb, model engineering at its finest congratulations
 
Tom Mallard

Tom Mallard

Western Thunderer
Various other things have been on the workbench this year, including these chassis for GWR Saints. There's a fair few small differences between these chassis, including cutouts for one which meant a representation of the inside motion felt necessary. The bogie frame is a little different, and the brake hangers will be too. Cylinders are also slightly above the axle centreline on the model with frame cutouts which will show a little more once the bodywork is in position.

Wheels are the fantastic Ultrascale product (GWR modellers have always been fortunate) gears for the custom gearboxes are by High Level.

The clockwork model of Caledonian Railway 828 is quite near completion after a fun time reproducing square holes in the wheels for the original pattern axle. It travels quite quickly under test but is governed by an ingenious adaptation made to the mechanism which smooths out the power delivery extremely effectively.

Enjoy your modelling

Tom

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Dave Holt

Dave Holt

Western Thunderer
Very neat indeed, Tom.
Boy, the front and centre drivers are close (P4 rims?) - not much room for brake hangers. How does that work? (BR 9Fs had a similar issue, but on them the hangers were behind the wheels, near the frames, then stepping out in line with the wheel treads below the blocks).
Dave.
 
Tom Mallard

Tom Mallard

Western Thunderer
Hawkeye said:
Beautiful work as always! How did you make the square holes, by the way?
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Thanks very much! The holes were bored slightly undersize, then machined very closely to width over faces using an indexing attachment and a 1.5mm milling cutter, followed by hand finishing to fit the axles. This might have various flaws from a workshop practise point of view, but it worked far better than the aborted square push broach method I started out with (this wandered off centre based on lack of experience, poor technique and lack of appropriate equipment such as an arbor press). the wheels were all plugged, and I started again...
 
Tom Mallard

Tom Mallard

Western Thunderer
Dave Holt said:
Very neat indeed, Tom.
Boy, the front and centre drivers are close (P4 rims?) - not much room for brake hangers. How does that work? (BR 9Fs had a similar issue, but on them the hangers were behind the wheels, near the frames, then stepping out in line with the wheel treads below the blocks).
Dave.
Click to expand...
They sure are Dave! The front brake hangers are very compact and locate more or less on the bottom edge of the frames. The earlier batches maintained this approach for the remaining pairs, though later batches switched to more normal longer hangers for rear pairs.
 
Phil O

Phil O

Western Thunderer
Dave Holt said:
Very neat indeed, Tom.
Boy, the front and centre drivers are close (P4 rims?) - not much room for brake hangers. How does that work? (BR 9Fs had a similar issue, but on them the hangers were behind the wheels, near the frames, then stepping out in line with the wheel treads below the blocks).
Dave.
Click to expand...

Dave,

When I talked to Colin at Alan Gibson, about wheels for a Star, he suggested going down to 6ft 6ins wheels. On the prototype they would be worn, but still above scrapping, to gain some clearance.
 
Tom Mallard

Tom Mallard

Western Thunderer
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The chassis and body got married, with the cylinder assemblies as offspring.

The cylinder assemblies were time consuming things to make in spite of the etched parts used. The slidebars have been made with the proper tapers and the motion brackets with different approaches depending on their relative protrusion through the footplate due to the earlier version having a higher centre for the cylinders.

The crossheads are built up from etches and turnings, cylinder covers from turnings and the gland from a couple of profile machined parts. Probably will do some cleaning up and tidying, but they've come out well enough.

Progress ought now to be vastly quicker with these critical assemblies largely complete.

Enjoy your modelling

Tom
 
Joe's Garage

Joe's Garage

Western Thunderer
Only a few months late Tom but those two L&B locos are beautiful.
I recently picked up a copy of Catchpole's Lynton and Barnstaple Railway book produced by Oakwood in a charity shop for the "vast" sum of £1!
Hence my interest in your thread especially the construction of the pair. Truly magnificent.
Sounds interesting the new WS book, yet another diversion!
Thank you
Julian
 
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