So here it is. TOU Mk2 and yet another moving sleeper with a difference. The shaping has made a lot of use of the milling machine. In fact the only part that I used a saw for was cutting the milled channels to length.
First I milled some channels to receive the sleeper tie bars in whatever this material is?
These are sized to fit into square section brass and were cut into 20mm lengths. The thickness is 2.5mm leaving a 0.5mm for the tubes that are soldered to the sleeper and a shim of 0.040" plasticard to make a snug fit in the brass section. Originally I had intended to glue the sleeper tie bar into some telescoping styrene sections but that didn't feel like the right move to make. This is shown in the top of the picture.
In the middle is a prototype for the final design: an off-cut of 3/16" square brass with a slot milled lengthways where the tubes protrude through. The various parts that fit within are shown beside it. At the bottom is the final design, which includes the lugs that fold around to retain the channel and shim, plus tabs for pinning the device to the sub track bed.
Here is the final design placed in situ. One of the wires will be used to link up to the operating lever but both are used as track feeds to the droppers for the switches. I'm thinking to cover it over with some paper because that is all the space I have!
Now to finish the other six and get them fitted.
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