Simple Trucks

Bill Shields version of simple trucks, based on Charles S. Purinton's design:

These do not look like much, but run well, even on the roughest of tracks. You don't really want or need springs on a riding car since (at least I) don't like to feel like I am 'floating'.

This design idea came from Charlie Purinton who used to make them with WOOD side frames for his 3/4" scale tenders and riding cars. Bill Van Brocklin did a few similar.

The ball bearings in the aluminum frame are about 0.020" loose on the diameter and just sit there, allowing for all the needed flex. The bearings are held to the axles with Loctite (what else). Bore has a step on it to allow axles to float about 1/16" side to side. Use very cheap ball bearings (low grade) with rubber flex seals)

The cross bolsters (sorry no pictures) are a piece of 1 x 1.5" hot rolled bar stock.

I made them in a weekend using old scrap wheel / axle sets that failed after 2 years of running from a commercial supplier.

If you want to spruce them up and knock the corners off the side bar, it will take only a few minutes on your handy-dandy belt sander.