Large-scale version

Bolt a 6'' Pulley half-disc (19d) to a 5-1/2'' Circular Girder (143), flared edge of the 19d pointing outwards, at four points using short bolts. Make two such constructions.

Now join the pair rim to rim at the other four points with internal Fishplates [preferably narrow versions (237) which are sturdier] OR with Couplings (63) mounted internally by running short bolts through the radial holes into the tapped bores. Check alignment before tightening. You now have a typical modern wheel hub, the width of which can be increased to achieve scale by adding more Circular Girders.

Other methods of attachment can be used if so preferred, e.g. Threaded Bosses (64).

A sketch of the arrangement drawn by British enthusiast Philip Webb is shown below. For ease of view, the attachment pieces are not shown.

Small-scale version

Replace the 6'' Pulley half-discs with 3'' Pulley half-discs (19e) and the 5-1/2'' Circular Girders with 2-1/2'' Wheel Flanges (137a). To bolt together the Wheel Flanges, use four internally mounted Insulating Spacers (564).

Note

See also IM #33 May 2001, Model-building Technology T383, p.16.