john coffin wrote: ↑Tue Dec 10, 2024 4:05 pm
It is also the "lamp iron" at the top does not seem quite right either.
I am quite happy to be wrong, but if we do not strive for your standards, then why are we bothering?
Paul
The original lamp iron hole was off centre and above the handrail stanchion hole. However, It has now been drifted centrally and will be incorporated into the top handrail stanchion as one more robust unit: its position will be adjustable with that assembly. It would not have survived for long in the original position.
And now for the start of the fun and games. The main 1mm-thick brass chassis spars for the Coronation set have been made and can be seen located in the 3DP chassis; designed and printed by Mike Trice. The articulated joint is an overlapping design, with the extra layer beneath the main spar.
The (currently) simple articulated joint was made by making the additional tongue from 1mm brass, drilled as a strip and then cut off, as required.
These short tongues were then soldered to the main spar using the pivot hole for location - the separate components can be seen at the top of the image with the soldering in progress towards the bottom. The drill shank was pushed into a mica block and the underside of the tongue on the spar notched to make it easier to cut through and remove when finished soldering. This also reduced solder flow in that region and the same tongue coated with a black felt tip acted as an anti-flux: of course drill shanks won’t take soft solder, either. The plastic bottle with a needle tube is for phosphoric acid flux.
This close up should make clear the inherent flexibility of the simple joint, but that is probably not how it will stay…
