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1:32 scale
P93
BR class 21/29, 22 Diesel driving wheel.

3′ 7″ diam., 11 oval spokes, vee inner rim, 4″ apparent tread, 5½″.
Hub 1′ 2″ face dia., 15/16″ out from the tyre.

Source: works drawing.

Casting: 34.2 mm diam., 28.0 mm i/d., hub 0.74 mmout from the tyre.
Tyre widths for exact scale models at 1:32, 5½″ = 4.37 mm. (From wks drg.)

Casting prices and stock . BR loco sets, price list

Scan of a casting in set for a BR Deisel Class 21/29 or Class 41 with prices of turned sets.

Scan of casting P93

Cross section diagram for casting P93

Cross section diagram for casting P93 for 6.0 mm wide tyre x 1.5 mm deep flange
A turning diagram marked out to show the work-holding steps as used for the form tool method.

In this case a 6.0 mm wide wheel with a 1.5 mm deep flange for Gauge One standard track.

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 a small rounded edge outside the flat surface
    (cut a little high, then another 1 or 2 cuts of 0.01 mm until it looks right).
  face the tyre 1.1 mm 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 the appropriate form tool.



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27 Mar 2013