Well it's been 2 years since my last post about this.
I got stalled when the bogies and chassis didn't live up to expectations.
I said previously:
Rather than just having a bogie that wobbles about it's central pivot, I wanted independent equalisation for it's axles and an ability to rock fore and aft
So here I have made some bogies that fit the same chassis and simply wobble about to cope with track irregularities.
They are not perfect but are not very visible under the carriage.
The wheels are 12 mm diameter and the lateral pivot is relatively higher so the top heaviness is reduced. Some shots taken during construction:
Construction is with styrene using a jig to keep the wheelbase equal.
The axles run in pin point bearings. Hollow sections are filled with lead shot.
More lead ballast.
The chassis is carried on the heads of pins fitted in the top of the bogies. These allow plenty of fore and aft rocking. The pins on one bogie are fitted further apart than on the other to control sideways tilt.
The bearing boxes are from card and are hollow, filled with lead shot.