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1:22.6, Gauge 3
LMS and BR carrying wheel.

3′ 0″ diam., 9 oval spokes, vee inner rim, apparent tread 3½″, tyre thickness 5¾″.
Hub 10¼″ face dia, 1½″ out from the tyre.

Sources: 2-6-4T 4MT at Chappel in 1995 and BR bogie arrangement works drawing.

Casting: 40.46 mm tread dia., 32.5 i/d., hub 1.6 mm above the tyre.

Gauge 3 loco set prices . Casting prices and stock

Scan of a casting in a sets for BR 4-6-0 4MT . BR 2-6-0 Riddles 4MT, BR 2-6-4T 4MT and BR 2-6-2T Riddles 3MT

Suitable for the Gauge 3 Society 2010 minimum tyre width of 6.8 mm, or the earlier standard of 8.0 mm.

Scan of casting T74
Scan of casting T74 machined
With a G3 Standard flange

Cross section diagram of casting X73

Cross section diagram of casting X73 for 6.8 mm tyre width
Turning diagram marked out to show the work-holding steps as used for the form tool method for a tyre 6.8 mm thick with a 2 mm deep flange.

1. mount the casting with its back out and cut the small step on the back.
2. with the front out,
  cut the larger step,
  face the hub so you leave the whole top face just planed over.
    (cut a little high, then another 1 or 2 cuts of 0.01 mm until it looks right).
  face the tyre 1.7 below the hub.
  bore the centre just under the size of the final reamed diameter.
3. with the back out, face the back to your chosen the tyre width.
4. mount the casting on a slightly loose (by diameter) mandrel between two discs, centre it, tighten up, and make the final cut with a form tool.

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27 Mar 2013