Old Problematic.
Dual Encoders ( Encoder over Encoder) are available and not to expensive 20-30 $
Realy problematic are Dual Encoder/12 position switch Combinations or 12 Position/12 Position Combinations... ( Need in B737 for example)
Again Problematic are Rotary Switches with Push Button (or Pull Button like in Airbus) .... and Dual Encoder combis with Buttons !
Here exist 2 technics....
1. Drilling a hole through the original encoder/Rotary shaft and using a " shaft in shaft" system.... the Outer shaft is glued to the first Rotary/encoder (Where you drill the hole)
The inner shaft go though bottom if 1 Encoder and ends in a second encoder/rotary one secetion below the first one.
( If needed you can use a 3.rd Shaft into second shaft to controll a button in section 3 or a 3rd encoder for example)
http://www.simprojects.nl/images/ROT_8.JPG
I try out this but thats sucks... With professional Stand Drilling machines maby possible.... But by hand this not work like it should.
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2. A Cogwheel System.
Here you use full self build shaft ( 2 Metal shafts 1 into the other.... or maby 3 if you need a Button or a 3. encoder like in B737 ADF Switch)
In this solution the outer shifts end in a Cogwheel on level 1 .... the Inner shaft go through and ends in a encoder/ratary in level 2.
The Cogwheel is connected to a other cogwheel nearby and THIS is connected to the shaft of the second Encoder/rotary ( That is mounted nearby the first.
( For a 3rd encoder (Button or so) you can also use more then 1 Cogwheel sections... Always remeber "deepness" of a switch is no problem... only widenesss and hight. )
Check out this picture.
http://www.fagerjord.org/cockpit/other_img/rotary_with_encoder.jpg
Those systems can be bought in shops but verry expensive and not individual.... if you have a CNC Machine you can plan this switches yourself.
Last Note:
With this system you can also build special 45° / 90° / 120° Switches.
Mostly we can only by 30° 12 Position switches. Other are not found or ultra expensive !
DIY Rework is again difficult and not realy perfect.
With a Cogwheel System like 1,5-1 you can make a 30° Switch into a 45° Switch.
This will work with that housing above too if you redseign it a bit.... Again verry usefull when you bild this mechanics youreself !
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