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7 mm/ft scale
NSWGR 4-4-0 class Z12 bogie wheels.

3′ 0½″ diam., 9 rectangular spokes, apparent tread 3″, tyre width 5½″.
Hub 12½″ face dia., ½″ out from the tyre.
Note the very slight forward projection of the tyre from the inner rim - the tyre was held to the wheel centre by bolts.

Casting: 21.3 tread dia., 17.7 i/d., hub 0.3 mm out from the tyre.

Casting prices and stock . Australian loco sets, price list

Scan of a casting in a set for a NSWGR 4-4-0 Z12.

Scan of casting B407

Cross section diagram of casting B407
This example shows a tyre width of 3.5 mm for Gauge 0 Fine.
For Scale7 remove more metal from the back of the wheel to give a tyre thickness of 3.2 mm instead of 3.5 mm.

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27 Mar 2013