After talking to Laurie about powered point changing, I conceded to myself that pneumatics have serious advantages. Not least that I have several compressors, storage vessels and regulators.
So each point will be powered by a small double acting ram operating at about 350 kpa (50psi) with about 16mm bore, 15mm stroke. The point movement is 10mm, so pressure will be held on the blades.
A 12VDC 3 way servo solenoid will switch each one. A small accumulator will be buried new each setup. The 12V will be wirelessly controlled and signals switched by the same relays...
So I have purchased several cylinders, solenoids, push on 6mm tube fittings and some tube. (Cheap Chinese, cost about $25 each setup). The relays and remote have arrived. And have made a couple of accumulators from 50mm PVC pressure piping.
