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1:22.6, Gauge 3
BR class 03 Diesel driving wheel.

3′ 7″ diam., 12 oval spokes, rectangular inner rim, apparent tread 3¾″, tyre width 6″.
Hub 12″ face dia., 3/8″ below the tyre, pin in line at 9½″.

Source: No 2184 (Swindon 1962) measured direct at the Colne Valley Railway in 1994.

Casting: 48.3 mm tread dia., 38.8 mm i/d., hub 0.4 mm below the tyre, pin at 10.9 mm.

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

Gauge 3 loco set prices . Casting prices and stock

Full sets information and Prototype image

Scan of casting X13  Scan of casting X13 machined  Scan of casting X13c machined

Cross section diagram for casting X13

Cross section diagram for casting X13 for 6.8 mm wide tyre
Diagram showing safe areas for work holding for machining with a form tool for 6.8 mm wide tyres.
A is the first cut. B is the second cut before facing the rest of the front.
Then bore the axle hole before reversing the work in the chuck and facing the back.
Then form the tyre by your preferred method.

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10 Apr 2013