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How terrible is it to use a #8 ring terminal on #6 screw?

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nuckolls.bob(at)aeroelect
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Posted: Mon Aug 30, 2021 9:15 am Post subject: How terrible is it to use a #8 ring terminal on #6 screw?

At 05:05 PM 8/29/2021, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com>



 Hi Group Dumb Thumb had some #8 ring terminals put on #22 or #20 wires and the screws are #6 on the terminal block. 	


   terminal block with studs or screws?



  	  Quote: 	
		  We have #6 phosphor bronze star washers on the screws. Is there any problems using as is? Or is

 it recommended to change over to #6 ring terminals that will require lengthening wires. Thx. Ron P. 	


   In the heavy iron factories, barrier strips

   with screws are generally avoided. Sometimes

   you just can't (like B&C alternator controllers)

   but if you do have a choice, terminal strips

   with captive studs are preferred. You can secure

   the terminal-stack with metal lock nuts.



   With respect to oversized holes in terminals recall

   that we're wanting to achieve a gas-tight interface

   between conducting components . . . If the hole

   is oversized, then area around the stud goes down.

   Force of the screw then exerts more pressure on

   as a function of reduced area.



   So electrically, I don't think there's much

   of a worry and for small (low mass) wires,

   there's probably not much in the way of 

   vibrational forces that might tend to loosen

   the threaded fasteners. The lock washers only

   increase probability that an loosening force

   applied through the terminal is more tightly

   coupled to the screw.



   As we discussed a few weeks ago, the first

   time the joint MOVES, tension in that joint

   goes down. Just how much and how fast is subject

   to a lot of variables.



   Got no heartburn about the terminals but I'd

   really like to see a mechanically more robust

   terminal strip. What system(s) use these

   wires? How critical to comfortable completion

   of a flight?



 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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rparigoris

Joined: 24 Nov 2009
Posts: 792

Posted: Mon Aug 30, 2021 11:32 am Post subject: Re: How terrible is it to use a #8 ring terminal on #6 scr

Hi Bob What the #6 screws are doing is to sandwich the ring terminals to a silver plated copper strip (attaches port #4 battery cable that goes to aft mounted battery on Europa XS Mono) and the flat terminal blocks are just acting as mounting nuts. It's acting as a ground block for non essential for flight grounds that I didn't want to run to my firewall field of tabs:

https://1drv.ms/u/s!Ah1S270Nwg9Vgd1med74mMX78IEPeg

star washers not yet installed. The stud you see will run power to port headrest. The reason the copper strip is sooo big is if I ever need to jump start, I can do so through my favorite paralleled Anderson Power pole connectors in starboard headrest:

https://1drv.ms/u/s!Ah1S270Nwg9Vgd4N_6p3XLoaofcVhQ

so it's possible that two of those #6 screw connections may be called upon to connect to my copper strip to jump start Rotax 914 with heavy duty starter.

Ron P.

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