This is the rotary switch. It's by Sanyo, part number RS-04068CA and although I can find refences to it on the internet, I can't find any datasheets as such, no matter where I look. No problem - it's a fairly simple device with a common connection and 8 outputs, suggesting that it's purely passive (ie no semiconductors). The shaft spins very freely and wants to end up in any of 8 positions. Clearly there's some sort of magnetic content in there. I'm guessing there are 8 reed switches but I don't need to know. Sure enough, when you spin the input, the switches close one after the other.
And the adjustment slots allow for a wide range of movement. However, there are marks where it was previously locked. With position 3 in the turret in the horizontal position (ie where it would be in use), the "#3" switch is closed. That all seems to add up.
There's also a couple of positions on the connector block for the microswitch that indicates that the turret has successfully locked.
The microswitch simply acts against the face of the driven gear. This moves axially during locking.
The coolant hose block mounts on the top of the housing.
I've removed the switch and terminal block for the moment, as they are rather delicate. Now, with a sling fitted, the engine crane can reach over the TIG welder and pick it up. Tomorrow I'll refit it to the cross slide.
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