HAWT DIY Vert. Axis Rotary Contact - 5 leads

The need to have additional data from the horz. axis forced me to go for a larger rotary contact.
I learned a lot from making the 2 lead rotary contact and refined the design so when I need to go to 6 it will be just an expansion of the 5.

Adding a hall effect sensor requires 3 more contacts.

Hopefully this new set up will work.

The mounting for the sensor.

Mostly complete rotating and stationary parts.

The lower end, I used a spare thrust bearing so no downward force on the system will be able to grind the plastic parts together.

5/8" OD pvc is perfect because the 21/32" of the shelf brass tube slides over it.
5 discrete, different length connections drop down from the inside,  1/8" brass tube is perfect for 4 - 40 screw threads.
Again, everything is designed to be robust, repairable, disassemble-able, and big enough that I can make it with out tweezers.

Machining the holes for the 5 identical rings that are loaded onto the tube 0.75" x 72 degrees apart.

Machining the 5 slots was as usual all about set-up; the set-up took an hour, the machining took 10 minutes.

Complete assembly

A little run-in for the commutators.

The anti rotation pin and receiver in place so as a module I can slide it off for service.

With the tower adapter attached.

Typical pin-out.

Test fit of the H/E sensor bracket.

A nice bit of success; have verified that the Sherline RPM gauge and the 4 LED RPM gauge collateral exactly, this is very good.

Also the output as measured from the rotary contact is identical to the earlier Sherline bench test.

System "Bench" test.

Interestingly the the stepper out-put is about 1 volt for every 10 RPM, anybody care to explain?