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Old 15th April 2004, 10:57 PM   #1
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Default A simple way to create dual(or more!) rotary switches out of single rotary switches

I'm in the process of building an alephP, and as most of you I'm having
a problem with finding good quality dual (or quad) rotary switches for a nice price.
In Sweden a dual ELMA type 4 retail at over $130...

Thats about as much as all the other components cost me combined.

Being an engineer, I was thinking of using COGWHEELS to make single rotary switches
into dual. As I was scraching my head planning on how to get the %#/"/! cogwheels
to fit nicely into one another my girlfriend asks me what I'm thinking about...
You know, a penny for your thoughts. I lay out my problem, and she says:
I know a solution! She makes a drawing and to my chargin it is a brilliant solution.
I'm sure some (many?) of you have thought and maybe implemented the
following, but for those of you for whom this is a new, here you go:
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Old 15th April 2004, 10:59 PM   #2
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And another pic:
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Old 15th April 2004, 11:06 PM   #3
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Interesting solution.
Sadly I have to admit that long ago I had to stop not listening to my wife.
Her comment "can I ask a stupid question" had come to
mean "I don't understand what you're doing but I have the answer...."

life can be cruel...
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Old 15th April 2004, 11:17 PM   #4
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I'm too lazy not to listen to people with answers!
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Old 16th April 2004, 01:06 AM   #5
Magura is offline Magura  Denmark
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In that case ....here you go

The easy solution is to drill a hole in the backside of the switch, into the axle, then cut M2 thread or M3 if the size of the axle allows and do the same in the front of the axle of the switch you want to couple it with. Now you can couple the switches with a simple piece of threaded rod....thats the lazy solution, done it a few times with 2 mono pots some time ago.

Magura
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Old 16th April 2004, 02:07 AM   #6
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can you show me how to weld a turbo--charger onto my 1987 560SEL?

really, you swedes have got to put the Akavit bottle away before you start the oxy-acetylene tanks.
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Old 16th April 2004, 02:23 AM   #7
Magura is offline Magura  Denmark
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I agree....swedes should not do drunk-welding

Magura
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Old 16th April 2004, 02:27 AM   #8
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with that machine you don´t need a turbo charger. And if you weld it you may damage more than you win.





the easy solution is to avoid the mechanics and use a relay volume control (like seen on my www)
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Old 16th April 2004, 03:24 AM   #9
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That looks more like epoxy than a weld.

Relay volume control - what a ridiculous idea.
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Old 16th April 2004, 06:58 AM   #10
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Thanks for the ide Margua. I'm not sure I want to drill into the switch though.
Won't scrap material have a chance to pollute the internal contacts?

I admit to _not_ having been drunk at the time of construction!
Yes I'm that bad... To my defence the weld is, as Bill says, plastic padding.
And the big lump (in the plastic-p) is there because a screw was used to reinforce
the connection.

Next time I'll make sure my work is presentable.
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