Today's Message Index:
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1. 09:28 AM - Re: metric threaded switches (Robert L. Nuckolls, III)
2. 09:51 AM - Re: metric threaded switches (hairy_kiwi)
3. 10:39 AM - Re: metric threaded switches (bob noffs)
4. 01:55 PM - Re: metric threaded switches (Robert L. Nuckolls, III)
5. 06:40 PM - Re: metric threaded switches (bob noffs)
6. 08:07 PM - Re: metric threaded switches (user9253)
7. 09:38 PM - Re: metric threaded switches (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: metric threaded switches |
At 11:56 AM 4/19/2019, you wrote:
>panel is .062 and current is less than 1 amp.
>placard is already cut to surround 6 holes so i
>would rather not overlay a washer on another overlay.
>=C2 bob noffs
The shoulder washer would be bonded on the back side,
the 'bushing in the hole would be flush with
the front surface. I think I've got a 1/4-40
tap around here somewhere. It would be about
a 10m job on the lathe . . .
Do you care about the size of the button? Push
buttons with 1/4" barrels are pretty small.
Emacs!
C&K 8121SHZGE
SWITCH PUSHBUTTON SPDT 1A 120V
Bob . . .
Message 2
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| Subject: | Re: metric threaded switches |
Hi Bob,
Without knowing the exact panel hole size for the CB (or the CB part number) you
wish to replace with a switch, this is a bit of a stab in the dark...
Short answer
I can recommend a couple of APEM series pushbutton switches I used in an aircraft
rewire job last year:
- APEM IM series
https://www.apem.com/us/im-series-13.html
RS Stock No. 864-4475 | Mfr. Part No. IMR7Z422104UL
12.0mm (0.472) mounting bushing.
These have a really nice tactile and audible feedback click - ideal for PTT switches.
Theyre rated IP67 (front seal) and designed for use in harsh, noisy environments,
including those with vibration. Additionally, the terminals can either
accept 2.8mm (0.11) spade receptacle terminals, such as TE 165565-1, or they
can be soldered.
- APEM 8000 series
https://www.apem.com/us/8000-series-354.html
RS Stock No. 103-5732 | Mfr Part No. 8632A
Either 6.35mm (1/4) or 10.9mm (15/32) mounting bushing sizes. The actuation force
is higher than the IM series and more of a snap-clunk than a click. Youll probably
also want a snap on pushbutton top for this switch - available in various
colours and typically in bags of 5.
Longer answer
Neither of the above suggestions are possibly exactly what youre looking for, so:
Visit the APEM website - other manufacturers offer similar, but I like the build
quality and features available in APEM products.
In the parametric search CONFIGURATOR, select:
Actuator: Pushbutton,
Bushing dimensions: acceptable panel hole sizes, min-thru-max inclusive,
Leave all the other options blank, at least initially.
Then, from the data sheets of those product ranges you find able to meet your minimum
requirements AND superficially/functionally appealing, see if your other
required/desirable features are available as options.
Youll discover most switches have features that can be tailored to a particular
requirement by tweaking the part number. After that, its a matter of plugging
your newly determined part number into the search bar on your preferred suppliers
website. Better still, plug it into Octopart.com to see if any of the global
suppliers stock it - and the smallest MOQ in which its actually available
for purchase. If that process turns up nothing, try using the basic part number
(i.e. the part number describing the highest level features, without all the
suffix options, eg APEM 8632) to try to discover if what you seek is actually
available to buy in unit quantities. Rinse and repeat.
Sourcing parts is, by its nature a tedious and often disappointing process. Having
not done any aircraft wiring work for some years, for last years project I
ended up ordering a number of styles and types of switches in order to find the
most suitable and appealing - from both ease of installation and end use perspectives.
For ease of installation while ensuring excellent wire strain relief,
I particularly like switch / LED indicator / CB products designed to accept
TE PIDG FASTON terminals, either in the 0.25 or 0.11 widths.
The suppliers parametric search engines can indeed be daunting and give less than
useful, or downright erroneous results - especially with the vast number of
options available within a product range. Nevertheless, they can be a useful
starting point. From there, Id download the manufacturers data sheet, rinse and
repeat - as above.
Tell us your current panel hole size and the max size youd consider enlarging it
to, and I or others might be able to give better recommendations.
Hamish
Ledbury, UK
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488845#488845
Message 3
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| Subject: | Re: metric threaded switches |
size of the button doesn't matter.it is used to reset an ovm if it trips.
probably only used for testing. if ovm trips in the air i think i wouldn't
be touching anything if the prop is still turning and i would be wanting a
runway!
bob noffs
On Sun, Apr 21, 2019 at 11:34 AM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 11:56 AM 4/19/2019, you wrote:
>
> panel is .062 and current is less than 1 amp. placard is already cut to
> surround 6 holes so i would rather not overlay a washer on another overla
y.
> =C3=82 bob noffs
>
>
> The shoulder washer would be bonded on the back side,
> the 'bushing in the hole would be flush with
> the front surface. I think I've got a 1/4-40
> tap around here somewhere. It would be about
> a 10m job on the lathe . . .
>
> Do you care about the size of the button? Push
> buttons with 1/4" barrels are pretty small.
>
> [image: Emacs!]
>
>
> *C&K 8121SHZGE * SWITCH PUSHBUTTON SPDT 1A 120V
>
>
> Bob . . .
>
Message 4
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| Subject: | Re: metric threaded switches |
At 12:38 PM 4/21/2019, you wrote:
>size of the button doesn't <http://matter.it>matter.it is used to
>reset an ovm if it trips. probably only used for testing. if ovm
>trips in the air i think i wouldn't be touching anything if the prop
>is still turning and i would be wanting a runway!
Alternator failure, while vexing, should
NOT be an emergency. Your battery should
be a reliable source of energy for
comfortable arrival with the earth.
But okay, what size is your existing
hole and what is the total panel
thickness (.062 plus overlay)?
Bob . . .
Message 5
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| Subject: | Re: metric threaded switches |
hi bob, panel is .062. overlay is .02 and panel hole is .433.
while an alternator failure would not be an emergency for me the thought
of it with this honda engine gets my attention more than it would with the
jabiru, my last engine. i do have 2 batteries independent of each other, 2
fuel pumps, and 2 ecu's but a failed alternator would really change my
priorities. not having ov protection on the output of the alternator
could make it an emergency if the ''impossible'' did happen. i have gotten
a lot of good input from this forum about this.
On Sun, Apr 21, 2019 at 4:00 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 12:38 PM 4/21/2019, you wrote:
>
> size of the button doesn't matter.it is used to reset an ovm if it trips.
> probably only used for testing. if ovm trips in the air i think i wouldn't
> be touching anything if the prop is still turning and i would be wanting a
> runway!
>
>
> Alternator failure, while vexing, should
> NOT be an emergency. Your battery should
> be a reliable source of energy for
> comfortable arrival with the earth.
>
> But okay, what size is your existing
> hole and what is the total panel
> thickness (.062 plus overlay)?
>
>
> Bob . . .
>
Message 6
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| Subject: | Re: metric threaded switches |
Digikey has a search function with one of the parameters being mounting hole diameter.
The hole in your panel is 11mm. I could not find a push button switch
with a diameter less than 11mm. But there are several with a diameter between
11.8 and 12mm. The panel hole would need to be enlarged 1mm.
https://www.digikey.com/products/en/switches/pushbutton-switches/199?FV=c3c00ef%2Cc3c00f7%2Cc3c0107%2Cc3c013d%2Cc3c017e%2Cc3c0051%2Cffe000c7&quantity=0&ColumnSort=783&page=3&stock=1&pageSize=25
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488852#488852
Message 7
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| Subject: | Re: metric threaded switches |
At 08:39 PM 4/21/2019, you wrote:
>hi bob, panel is .062. overlay is .02 and panel hole is .433.
Yeah, the miniature breakers are 7/16-32 thread.
Here's what I was trying to describe:
Emacs!
I think I've got some alum rod stock
and a 1/4-40 tap around here. Could
probably cut this out for you in the
not too distant future.
The C&K push button would
thread in from the back with enough
protrusion to install one of the nuts.
You could probably assemble the washer
and nut onto the switch and then bond
it into place.
Bob . . .
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