start switches...

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


Stef

Quote:

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Originally Posted by RadarBob

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

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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

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

56% is correct.

Gary

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.

In the starters of B742 (real panel I have here)
You have to push to rotate to both sides.

Quote:

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Originally Posted by vidarf

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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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...

nothing to add to what Efe said.

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

Stef