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D-subminiature Connectors

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Sat May 29, 2010 3:51 am Post subject: D-subminiature Connectors

5/29/2010



Hello Fellow Builders, Here is what we are writing about:



http://en.wikipedia.org/wiki/D-subminiature



Bob Nuckolls writes: "It's a fact that the majority of d-sub connectors come 

with

    short, slotted-head 4-40 jack screws that are EXCEEDINGLY

    difficult to work with in confined spaces traversed by wire

    bundles." ..and ... "the inconvenience of stock, slot-head jack-screws."



{RESPONSE}  He offers a screw handling solution here:



http://tinyurl.com/34nrdd5



I'd like to offer another solution -- use #4-40 machine screws with hex 

socket (Allen wrench) drive heads. The hex socket drive head allows one to 

manuever the small screws in a manner vastly superior to a straight slot or 

phillips drive head screw.



See here for a source of such screws:



http://www.microfasteners.com/catalog/products/SSC.cfm



Here is just one source of tools for handling these screws:



http://www.bondhus.com/



Conventional Allen wrenches work fine for most handling of these screws, but 

these Prohold tools will give even more control if needed:



http://www.bondhus.com/features/prohold/body-0.htm



'OC' Says: "The best investment we can make is the effort to gather and 

understand knowledge."



PS: An aerospace vehicle with hex socket or Torx / six lobe / star drive 

fasteners is much easier to work on than a vehicle with straight slot or 

Phillips drive fasteners. See here for some handy tool kits to work with the 

hex socket or Torx / six lobe / star drive fasteners:



http://www.chapmanmfg.com/



========================================================



Time: 10:28:24 AM PST US

From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>

Subject: Re: Gauge wiring best practice

I would like to make the panel easily disconnectable, and I'm going to

be using something like Tyco AMP MATE-N-LOK connectors for connecting

other things to the panel.  (These are multi-way locking connectors,

with crimped pins, supporting various wire gauges -- 10-30AWG at

least).



   Keep in mind that every connector interface adds three new

   joints to every wire. Running lots of electro-goodies through a

   single connector adds a single point of failure for all

   those electro-goodies........



BIG SKIP

    Probably no functional differences. However, it's

    been my observation over the years that spending a lot

    of time adding complexity for some perceived future

    convenience has a poor return on investment. Suggest

    you 'enhance' the stock jack-screws and wire each

    instrument as a stand-alone system while minimizing

    features shared with other systems.



   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat May 29, 2010 7:25 am Post subject: D-subminiature Connectors

 	  Quote: 	
		  



 I'd like to offer another solution -- use #4-40 machine screws with hex socket (Allen wrench) drive heads. The hex socket drive head allows one to manuever the small screws in a manner vastly superior to a straight slot or phillips drive head screw.

 	


    Good put Bob! I'd neglected to include that

    process. I use a LOT of the hex-headed cap

    screws in the various instrumentation packages

    I've developed. 



    This whole system is held together with

    hex-cap screws.



  http://tinyurl.com/3xzsvrd 



  http://tinyurl.com/3xzsvrd 



    . . . very handy . . . especially when numerous

    assembly/disassembly operations are necessary.

    Thanks for adding this to the recipes for success.



 

   Bob . . .    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat May 29, 2010 8:57 am Post subject: D-subminiature Connectors

I've updated the image at:



http://tinyurl.com/34nrdd5

    to include Bob's contribution to the question

    of user friendly jackscrews.



    Bob . . .

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james(at)etravel.org
Guest

Posted: Sun May 30, 2010 5:00 am Post subject: D-subminiature Connectors

Nice one, thank you.  That's excellent & timely advice.



James



On Sat, May 29, 2010 at 12:49 PM,  <bakerocb(at)cox.net> wrote:

 	  Quote: 	
		   



 5/29/2010



 Hello Fellow Builders, Here is what we are writing about:



 http://en.wikipedia.org/wiki/D-subminiature



 Bob Nuckolls writes: "It's a fact that the majority of d-sub connectors come

 with

   short, slotted-head 4-40 jack screws that are EXCEEDINGLY

   difficult to work with in confined spaces traversed by wire

   bundles." ..and ... "the inconvenience of stock, slot-head jack-screws."



 {RESPONSE}  He offers a screw handling solution here:



 http://tinyurl.com/34nrdd5



 I'd like to offer another solution -- use #4-40 machine screws with hex

 socket (Allen wrench) drive heads. The hex socket drive head allows one to

 manuever the small screws in a manner vastly superior to a straight slot or

 phillips drive head screw.



 See here for a source of such screws:



 http://www.microfasteners.com/catalog/products/SSC.cfm



 Here is just one source of tools for handling these screws:



 http://www.bondhus.com/



 Conventional Allen wrenches work fine for most handling of these screws, but

 these Prohold tools will give even more control if needed:



 http://www.bondhus.com/features/prohold/body-0.htm



 'OC' Says: "The best investment we can make is the effort to gather and

 understand knowledge."



 PS: An aerospace vehicle with hex socket or Torx / six lobe / star drive

 fasteners is much easier to work on than a vehicle with straight slot or

 Phillips drive fasteners. See here for some handy tool kits to work with the

 hex socket or Torx / six lobe / star drive fasteners:



 http://www.chapmanmfg.com/



 ========================================================



 Time: 10:28:24 AM PST US

 From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>

 Subject: Re: Gauge wiring best practice

 I would like to make the panel easily disconnectable, and I'm going to

 be using something like Tyco AMP MATE-N-LOK connectors for connecting

 other things to the panel.  (These are multi-way locking connectors,

 with crimped pins, supporting various wire gauges -- 10-30AWG at

 least).



  Keep in mind that every connector interface adds three new

  joints to every wire. Running lots of electro-goodies through a

  single connector adds a single point of failure for all

  those electro-goodies........



 BIG SKIP

   Probably no functional differences. However, it's

   been my observation over the years that spending a lot

   of time adding complexity for some perceived future

   convenience has a poor return on investment. Suggest

   you 'enhance' the stock jack-screws and wire each

   instrument as a stand-alone system while minimizing

   features shared with other systems.



  Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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