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metric threaded switches

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bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Fri Apr 19, 2019 3:10 am Post subject: metric threaded switches

hi all,

 i am looking for a momentary push button switch to use in a panel hole meant for a breaker. 1/4'' and 1/2'' switches are common but i thought if there is a source for switches calling for metric sized holes i might find something.

 mouser and digikey are kind of daunting with 200,000 choices . i don't know how to sort for barrel size if there was such a thing.

 thanks for any help. any sources would be appreciated.

 bob noffs

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Apr 19, 2019 8:35 am Post subject: metric threaded switches

At 06:10 AM 4/19/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "bobnoffs" <icubob(at)gmail.com>



 hi all,

  i am looking for a momentary push button switch to use in a panel hole meant for a breaker. 1/4' and 1/2' switches are common but i thought if there is a source for switches calling for metric sized holes i might find something.

  mouser and digikey are kind of daunting with 200,000 choices . i don't know how to sort for barrel size if there was such a thing.

  thanks for any help. any sources would be appreciated. 	


  How much current? How thick the panel?

  If a 1/4" switch is electrically suitable,

  then I'd cut a shoulder washer to keep

  it centered in the oversized hole.



 



 

   Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Apr 20, 2019 5:41 am Post subject: metric threaded switches

 	  Quote: 	
		  

  How much current? How thick the panel?

  If a 1/4" switch is electrically suitable,

  then I'd cut a shoulder washer to keep

  it centered in the oversized hole. 	


   What is the diameter of your present

   hole?



 

   Bob . . .

bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Sat Apr 20, 2019 11:40 am Post subject: metric threaded switches

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.Â bob noffs

On Fri, Apr 19, 2019 at 11:41 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 06:10 AM 4/19/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "bobnoffs" <icubob(at)gmail.com (icubob(at)gmail.com)>



 hi all,

 Â i am looking for a momentary push button switch to use in a panel hole meant for a breaker. 1/4' and 1/2' switches are common but i thought if there is a source for switches calling for metric sized holes i might find something.

 Â mouser and digikey are kind of daunting with 200,000 choices . i don't know how to sort for barrel size if there was such a thing.

 Â thanks for any help. any sources would be appreciated. 	


 Â How much current? How thick the panel?

 Â If a 1/4" switch is electrically suitable,

 Â then I'd cut a shoulder washer to keep

 Â it centered in the oversized hole.



 



 

 Â  Bob . . .

user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Sat Apr 20, 2019 11:59 am Post subject: Re: metric threaded switches

What is the diameter of the existing hole that you intend to mount a switch in?

_________________
Joe Gores

art(at)zemon.name
Guest

Posted: Sat Apr 20, 2019 4:39 pm Post subject: metric threaded switches

Bob,

Have you thought about simply up-sizing the hole to fit the push button switch that you want to install?

Â  Â Â 

Â  Â  -- Art Z.

On Fri, Apr 19, 2019 at 6:24 AM bobnoffs <icubob(at)gmail.com (icubob(at)gmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "bobnoffs" <icubob(at)gmail.com (icubob(at)gmail.com)>

 

 hi all,

 Â i am looking for a momentary push button switch to use in a panel hole meant for a breaker. 1/4' and 1/2' switches are common but i thought if there is a source for switches calling for metric sized holes i might find something.

 Â mouser and digikey are kind of daunting with 200,000 choices . i don't know how to sort for barrel size if there was such a thing.

 Â thanks for any help. any sources would be appreciated.

 Â bob noffs 	


-- 

https://CheerfulCurmudgeon.com/"Love wins. Love always wins." Morrie Schwartz

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 21, 2019 8:28 am Post subject: metric threaded switches

At 11:56 AM 4/19/2019, you wrote:

  	  Quote: 	
		  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.

 Â 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.



 [img]cid:.0[/img]



   

 C&K 8121SHZGE  SWITCH PUSHBUTTON SPDT 1A 120V 



 

 

   Bob . . .

a15bc70.jpg

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hairy_kiwi

Joined: 16 Sep 2018
Posts: 2
Location: Ledbury, UK

Posted: Sun Apr 21, 2019 8:50 am Post 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 (0.472â€) mounting bushing.

These have a really nice tactile and audible feedback click - ideal for PTT switches. Theyâ€™re rated IP67 (front seal) and designed â€œfor use in harsh, noisy environments, including those with vibrationâ€. Additionally, the terminals can either accept 2.8mm (0.11â€) 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 (1/4â€) or 10.9mm (15/32â€) mounting bushing sizes. The actuation force is higher than the IM series and more of a snap-clunk than a click. Youâ€™ll 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 youâ€™re 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 â€˜CONFIGURATORâ€™, 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.

Youâ€™ll discover most switches have features that can be tailored to a particular requirement by tweaking the part number. After that, itâ€™s a matter of plugging your newly determined part number into the search bar on your preferred supplierâ€™s website. Better still, plug it into Octopart.com to see if any of the global suppliers stock it - and the smallest MOQ in which itâ€™s 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 yearâ€™s 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 0.25â€ or 0.11â€ widths.



The suppliersâ€™ 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, Iâ€™d download the manufacturerâ€™s data sheet, rinse and repeat - as above.



Tell us your current panel hole size and the max size youâ€™d consider enlarging it to, and I or others might be able to give better recommendations.



Hamish

Ledbury, UK

bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Sun Apr 21, 2019 9:39 am Post subject: 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!Â bob noffs

On Sun, Apr 21, 2019 at 11:34 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 11:56 AM 4/19/2019, you wrote:

  	  Quote: 	
		  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.

 Ã‚ bob noffs 	


 Â The shoulder washer would be bonded on the back side,

 Â the 'bushing in the hole would be flush with

 Â the front surface. I think I've got a 1/4-40

 Â tap around here somewhere. It would be about

 Â a 10m job on the lathe . . .



 Â Do you care about the size of the button? Push

 Â buttons with 1/4" barrels are pretty small.



 [img]cid:16a40f561c678b2ec121[/img]



 Â  

 C&K 8121SHZGE  SWITCH PUSHBUTTON SPDT 1A 120V 



 

 

 Â  Bob . . .

a15bc70.jpg

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Filesize:

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Viewed:

12238 Time(s)

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 21, 2019 12:55 pm Post subject: metric threaded switches

At 12:38 PM 4/21/2019, you wrote:

  	  Quote: 	
		  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 . . .

bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Sun Apr 21, 2019 5:40 pm Post subject: metric threaded switches

hi bob, panel is .062. overlay is .02 and panel hole is .433.Â while an alternator failure wouldÂ  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, andÂ  2 ecu's but a failed alternator would really change my priorities. not havingÂ  ov protection on the output of the alternatorÂ  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(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 12:38 PM 4/21/2019, you wrote:

  	  Quote: 	
		  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! 	


 Â  Alternator failure, while vexing, should

 Â  NOT be an emergency. Your battery should

 Â  be a reliable source of energy for

 Â  comfortable arrival with the earth.



 Â  But okay, what size is your existing

 Â  hole and what is the total panel

 Â  thickness (.062 plus overlay)?



 

 

 Â  Bob . . .

user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Sun Apr 21, 2019 7:06 pm Post 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

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 21, 2019 8:38 pm Post subject: metric threaded switches

At 08:39 PM 4/21/2019, you wrote:

  	  Quote: 	
		  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:



 [img]cid:7.1.0.9.0.20190421225936.05eb0db8(at)aeroelectric.com.0[/img] 



   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 . . .

cb17724.jpg

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bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Mon Apr 22, 2019 5:52 am Post subject: metric threaded switches

hi bob,Â iÂ  appreciate your offer but it just isn't worth your time and energy to do all this. the panel isn't mounted and it will take me a minute to ream/drill the panel and overlay to a larger diameter to accommodate an existing switch. wasn't my first choice but it will be fine.

Â thank you for the offer.

Â bob noffs

On Sun, Apr 21, 2019 at 11:43 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 08:39 PM 4/21/2019, you wrote:

  	  Quote: 	
		  hi bob, panel is .062. overlay is .02 and panel hole is .433. 	


 Â  Yeah, the miniature breakers are 7/16-32 thread.



 Â  Here's what I was trying to describe:



 [img]cid:16a454d62c180c4a6c71[/img] 



 Â  I think I've got some alum rod stock

 Â  and a 1/4-40 tap around here. Could

 Â  probably cut this out for you in the

 Â  not too distant future.



 Â  The C&K push button would

 Â  thread in from the back with enough

 Â  protrusion to install one of the nuts.



 Â  You could probably assemble the washer

 Â  and nut onto the switch and then bond

 Â  it into place.



 

 Â  Bob . . .

cb17724.jpg

Description:

Filesize:

36.99 KB

Viewed:

12215 Time(s)

bobnoffs

Joined: 04 Jul 2012
Posts: 132
Location: northern wi.

Posted: Mon Apr 22, 2019 6:13 am Post subject: metric threaded switches

thanks hamish,Â i will look into it. looking at digikey or mouser i always get the feeling i better have the afternoon free.

Â bob noffs

On Sun, Apr 21, 2019 at 11:56 AM hairy_kiwi <hamish.mead(at)gmail.com (hamish.mead(at)gmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "hairy_kiwi" <hamish.mead(at)gmail.com (hamish.mead(at)gmail.com)>

 

 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 (0.472â€) mounting bushing.

 These have a really nice tactile and audible feedback click - ideal for PTT switches. Theyâ€™re rated IP67 (front seal) and designed â€œfor use in harsh, noisy environments, including those with vibrationâ€. Additionally, the terminals can either accept 2.8mm (0.11â€) 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 (1/4â€) or 10.9mm (15/32â€) mounting bushing sizes. The actuation force is higher than the IM series and more of a snap-clunk than a click. Youâ€™ll 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 youâ€™re 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 â€˜CONFIGURATORâ€™, 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.

 Youâ€™ll discover most switches have features that can be tailored to a particular requirement by tweaking the part number. After that, itâ€™s a matter of plugging your newly determined part number into the search bar on your preferred supplierâ€™s website. Better still, plug it into Octopart.com to see if any of the global suppliers stock it - and the smallest MOQ in which itâ€™s 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 yearâ€™s 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 0.25â€ or 0.11â€ widths.

 

 The suppliersâ€™ 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, Iâ€™d download the manufacturerâ€™s data sheet, rinse and repeat - as above.

 

 Tell us your current panel hole size and the max size youâ€™d 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

 

 

 

 

 

 

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