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Tube❄️Time

the anti backlash gearing is a giant pain to deal with. I'm making up a bunch of these springs to hold them in place so I can reinstall gears

11 comments
Tube❄️Time replied to Tube❄️Time

finally got the "Analog Digital Converter" opened up. it's rather complicated! there are multiple absolute encoder wheels connected with a gear train.

Tube❄️Time replied to Tube❄️Time

tiny brushes on an encoder wheel.

Tube❄️Time replied to Tube❄️Time

since i had the gearbox all opened up i counted more teeth and figured out that the coarse-to-fine synchro ratio is actually 1:11, not 1:12 as i previously thought.

Glen Akins replied to Tube❄️Time

@tubetime 1:11 isn't like any encoding altimeters I've seen but I'm still betting on an analog synchro to digital Gillham code converter.

Tube❄️Time replied to Glen

@bikerglen the Air Data Computer that Ken has been busy with uses the 1:11 ratio as well. i think this unit is from the same avionics system and is designed to be connected to one of the computer's outputs. maybe altitude.

Tube❄️Time replied to Tube❄️Time

this is going to be a real pain to reassemble. I've put in springs to put tension on the backlash mechanisms.

Tube❄️Time replied to Tube❄️Time

so I got everything lined up and the top plate reinstalled. I just have to pluck out the springs and tape.

Tube❄️Time replied to Tube❄️Time

yep, that was a pain. but it is back together, and I have all the connector pinouts!

Tube❄️Time replied to Tube❄️Time

the potentiometers are not all linear relative to position. fascinating.

Thorwegian ❄️ replied to Tube❄️Time

@tubetime it's probably difficult to make them completely linear

Dantali0n :arch: :i3: replied to Tube❄️Time

@tubetime its typical to see 'log' pots consist of two or three different gradients like you see on the orange line here. Whats most interesting to me is the 'deadzone' of the green pot I don't think I have seen that before

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