billbedford wrote:Why do you need a tube? why not just use 1mm id bearings? The wagons would then be freer running.
Bill, I need to be able to remove the axles in the event of.........I originally tried with turned bearings albeit they were 2mm id but was not totally satisfied with alignment. OK,they ran but having tested the current option with 'half trunnion bearings' and the tube the running has improved immensely way beyond my expectation, also the fabrication is much simpler.
Guy Rixon wrote:
The tube potentially offers better alignment of the bearing surfaces. Parallel bearings can generate a lot of friction if they are not perfectly coaxial, as I've seen in my wagons with Exactoscale suspension.
Guy, you've hit the nail on the head.......
.........although I do not have the added problem of suspension. Just have to make sure the trunnion bearings are almost dead on so all four wheels sit on the rail. 3 chassis (whats the plural of chassis?) now completed and all fine and free running, which is my goal.