It is not generally possible to use 00 'scale' wheels to model the broad gauge, as the over scale treads and flanges will not fit within the very limited clearances available. This limits the choice of wheels that can be used, as Ultrascale are only available to order with a huge lead time, and Sharman Wheels are no longer available, having disappeared into the Phoenix Precision Paints 'black hole'. Unless you can aquire second hand product, Alan Gibson is the only option. The Broad Gauge Society can supply a very limited range of wheels (2) at a premium price.
|Back to Back
|Pinpoint axle length
||35.3mm (BGS ones nominal 35mm)
Alan Gibson driving and bogie wheels are supplied with 2mm diameter(bogie) or 1/8" diameter(driving) axles for 18.83mm gauge (assuming you have the correct profile wheels), which will need to be replaced for broad gauge purposes. 2mm and 1/8 " silver steel rod is available from Eileens Emporium, eBay etc. It is hard to cut - use a junior hacksaw; or easier - a slitting disc in a mini-drill.
The axle length given for the outside crank wheelsets is for a scale dimension. As the Alan Gibson cranks are vastly overscale in thickness, the axle lengths will need increasing, or the cranks thinned to be able to clear the footplate.
|4842C - 3'6" dia
|4847NW - 3'11 dia 12 spoke
|G4863 - 5'2 1/2" dia 16 spoke OC
|4872W - 6'0 dia 20 spoke
|4884 - 7'0 dia 22 spoke
When I first started broad gauge modelling, pinpoint axles were not available (out of stock with the BGS for years), so I had to make my own. I turned down some steel rod in the lathe, and the result worked (sort
of), but I had trouble with the rod flexing while machining the ends, and making the pinpoints
off centre, which introduced wheel wobble. More recently I figured out a much easier method, which does not require the use of a lathe.
In addition to a P4 gauge pinpoint wheelset, you will require some 2mm inside diameter brass tube from KS or similar (available on eBay). Just cut the existing wheelset in half, no need to remove the wheels from the axle - it doesn't need to be precise. Then cut a 27mm length of the brass tube using your back to back gauge as a guide (cut overlength and file back to be the same width as your gauge). Now just superglue the 2 half wheelsets into the ends of the tube.
Some 3D models I have designed. Licensed for personal use only :
Tyre outside radius 4' 6" Interpolation 25
Tyre thickness 2.6", inside radius 4' 3.4"
Tyre width 6"
Hub radius 9.5"
Hub width 6"
Axle hole radius 4.762" (1/8" * 76.2 / 2)
Spokes 2" wide 5" deep, chamfered 0.5" and 0.2"
array of 26 at angle increments of 13.846degrees
4mm scale 9 foot wheel
7mm scale 9 foot wheel
Page updated : 14 July 2020