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Thread: start switches...
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03-22-2009, 06:58 PM #41
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sure, if i find time to open them again.....what angle ?
Stef
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03-22-2009, 07:00 PM #42
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03-22-2009, 08:03 PM #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
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03-22-2009, 11:01 PM #44
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- Canada
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56% is correct.
Gary
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03-23-2009, 01:18 PM #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.
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03-23-2009, 01:31 PM #46
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.
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03-23-2009, 02:33 PM #47
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03-23-2009, 04:33 PM #48
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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
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