As I’m planning to print patterns for the wheels, I could no longer be satisfied with blank discs representing the wheels, even in OnShape. They’re a bit of a challenging part to draw, but I think I’ve captured the look of this photo from the Parry Sound Public Library. Possibly the hub is too small – what do you think?
To draw the model, I sketched the cross section (based on Fig 355 of Meyer, Modern Locomotive Construction), and rotated the spoke portion of the cross-section to form a flat cone. Then I sketched the face of the wheel perpendicular to the cross-section, and used this sketch to cut the spaces between spokes. The hub and counterweight were straightforward extrusions before rotating in the wheel rim and tyre. Finally, I filleted the edges of the spokes and their connections to the rim.
I can’t wait to see how I solve the painting challenge on these wheels! Good luck future-Rene!