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  1. #41
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    sure, if i find time to open them again.....what angle ?


    Stef
    www.boeing737ng.com
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  2. #42
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    Quote Originally Posted by RadarBob View Post
    Can you see how the detents are done ? Does it rely on the micro-switches falling into the notches in the shaft - Or does something else do that ?



    Cheers,

    Rob
    Theres a disk in the front end with a spring and little metal balls that takes care of the detents.

    I'll try to capture them with a photo if i find the time.

    Stef
    www.boeing737ng.com
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  3. #43
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    Thanks for the info Stef.

    Been doing a few rough sketches to see if I can come up with something simple to do the job. I'm ok on electronics, but I don't really have the tools to do any complicated mechanics.

    I think I have a solution for the solenoid hold-in and flick-back, but it depends if I can get enough return spring power to overcome the detent and any friction due to the spring on the knob push-in, within the available space and with only 30 degrees of rotation.

    Not sure what size those original switches are, but it appears from the Engine Start Panel I have in progress here, that they would need to be something in the order of 50mm wide by 50mm high - Length behind the panel not so critical, but around 125mm I would think.

    I was musing over using opto-sensors instead of micro-switches to get the resistance and size down.

    Haven't figured out how to get the trigger to release the solenoid at the correct N2 (56% ?), but I assume this can be done using SIOC.

    Cheers,

    Rob

  4. #44
    56% is correct.

    Gary

  5. #45
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    Angles: both sides, top (above the shaft, on the round edge).

    Another thing - how does the switch operate? Am I correct here:

    - OFF to GND: push in, rotate left
    - OFF to CONT, FLT and beyond: rotate right, no push in

    I've thought about making my own switches - if my assumption is correct, it should be relatively easy to do so.

  6. #46
    75+ Posting Member ran56's Avatar
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    In the starters of B742 (real panel I have here)
    You have to push to rotate to both sides.
    Ran Finkels
    Former B763 Builder - FS9 Simvionics. LDS, FDS OC etc.

  7. #47
    500+ This must be a daytime job


    Efe Cem Elci's Avatar
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    Quote Originally Posted by vidarf View Post
    Angles: both sides, top (above the shaft, on the round edge).

    Another thing - how does the switch operate? Am I correct here:

    - OFF to GND: push in, rotate left
    - OFF to CONT, FLT and beyond: rotate right, no push in

    I've thought about making my own switches - if my assumption is correct, it should be relatively easy to do so.
    Push in both ways.

    At OFF:
    Push in, rotate left to GND.
    Push in, rotate right to CONT, FLT, ...

    At GND:
    rotate right to OFF, pops out.

    At CONT:
    rotate left to OFF, pops out.
    rotate right to FLT.

    etc.

    You get the idea...

  8. #48
    500+ This must be a daytime job
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    nothing to add to what Efe said.

    Except for the extra pictures, but i didnt find time yet to make more.

    Stef
    www.boeing737ng.com
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