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jan_de_jong(at)casema.nl
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 Posted: Mon Mar 04, 2019 12:29 am Post subject: Insulator in durable gas tight compression |
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I have a simple question.
Is there any example in acceptable practices where an insulating layer
(some laminate?) is part of the stack of metal layers that is compressed
to ensure a durable gas tight low resistance electrical connection
between the metal layers?
If there is such that would be great. If such can be categorically
denied that would be great too.
Thanks.
Jan de Jong
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Mon Mar 04, 2019 7:33 am Post subject: Re: Insulator in durable gas tight compression |
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Some switches are made with a layer of plastic included in the compressed electrical connection.
They are prone to fail. How about mica?
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Joe Gores |
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jan_de_jong(at)casema.nl
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| Posted: Mon Mar 04, 2019 12:36 pm Post subject: Insulator in durable gas tight compression |
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Bob, Joe, Dick, thank you.
This is exactly what I meant - is it possible to combine mechanical
connection, isolated, with electrical connection, gas tight as required,
by compressing the whole lot. It appears not - the functions have to be
separated because the isolating panel material is likely to relax too
much. In any case it looks like it is not in the accepted toolbox.
Sorry I caused confusion.
Jan de Jong
On 3/4/2019 6:48 PM, Dick Tasker wrote:
| Quote: |
<dick(at)thetaskerfamily.com>
I believe you are asking is it okay to use some sort of laminate in
the stack-up of layers wherein the goal is to have something to mount
the connection to and insulate it from your airplane sheet metal and
that will not affect the "gas-tightness" of the connection.
If that is the question, I believe that the answer would be that there
are very few materials that would allow that. Ceramic would work, but
that is hared to work with. Any plastic type material probably is too
soft to not allow some relaxation over time of the joint.
The way to do what I think you want is to connect the bolt (or
whatever is part of the whole assembly) to the laminate with a nut and
then put the ring-lug (or whatever needs to be connected) onto the
bolt and then use another nut to make the connection gas tight. Or if
you are just using the laminate to hold the joint in place, place the
two lugs that need to be connected over the first nut and then use the
final to make it gas tight.
If I have misinterpreted your goal, then just ignore this comment.
Dick Tasker
Jan de Jong wrote:
>
> <jan_de_jong(at)casema.nl>
>
> I have a simple question.
> Is there any example in acceptable practices where an insulating
> layer (some laminate?) is part of the stack of metal layers that is
> compressed to ensure a durable gas tight low resistance electrical
> connection between the metal layers?
> If there is such that would be great. If such can be categorically
> denied that would be great too.
> Thanks.
> Jan de Jong
>
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jan_de_jong(at)casema.nl
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| Posted: Mon Mar 04, 2019 2:41 pm Post subject: Insulator in durable gas tight compression |
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..
I was actually looking at very hard phenolic laminates and other hard
insulating materials and considering Belleville washers etc. at
McMaster. when I decided to pose my question as a sanity check. I do not
plan to experiment with my electrical connections.
Thanks,
Jan de Jong
On 3/4/2019 9:09 PM, Jan de Jong wrote:
| Quote: |
<jan_de_jong(at)casema.nl>
Bob, Joe, Dick, thank you.
This is exactly what I meant - is it possible to combine mechanical
connection, isolated, with electrical connection, gas tight as
required, by compressing the whole lot. It appears not - the functions
have to be separated because the isolating panel material is likely to
relax too much. In any case it looks like it is not in the accepted
toolbox.
Sorry I caused confusion.
Jan de Jong
On 3/4/2019 6:48 PM, Dick Tasker wrote:
>
> <dick(at)thetaskerfamily.com>
>
> I believe you are asking is it okay to use some sort of laminate in
> the stack-up of layers wherein the goal is to have something to mount
> the connection to and insulate it from your airplane sheet metal and
> that will not affect the "gas-tightness" of the connection.
>
> If that is the question, I believe that the answer would be that
> there are very few materials that would allow that. Ceramic would
> work, but that is hared to work with. Any plastic type material
> probably is too soft to not allow some relaxation over time of the
> joint.
>
> The way to do what I think you want is to connect the bolt (or
> whatever is part of the whole assembly) to the laminate with a nut
> and then put the ring-lug (or whatever needs to be connected) onto
> the bolt and then use another nut to make the connection gas tight.
> Or if you are just using the laminate to hold the joint in place,
> place the two lugs that need to be connected over the first nut and
> then use the final to make it gas tight.
>
> If I have misinterpreted your goal, then just ignore this comment.
>
> Dick Tasker
>
> Jan de Jong wrote:
>>
>> <jan_de_jong(at)casema.nl>
>>
>> I have a simple question.
>> Is there any example in acceptable practices where an insulating
>> layer (some laminate?) is part of the stack of metal layers that is
>> compressed to ensure a durable gas tight low resistance electrical
>> connection between the metal layers?
>> If there is such that would be great. If such can be categorically
>> denied that would be great too.
>> Thanks.
>> Jan de Jong
>>
>>
>>
>>
>>
>
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Mon Mar 04, 2019 2:57 pm Post subject: Re: Insulator in durable gas tight compression |
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You can use two nuts on the bolt. The first nut holds the bolt in place on the
insulating material. The electrical ring terminals go on next followed by the
second nut. The two nuts compress the terminals together with no plastic in between.
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Joe Gores |
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jan_de_jong(at)casema.nl
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| Posted: Mon Mar 04, 2019 3:42 pm Post subject: Insulator in durable gas tight compression |
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Yes, separating the functions of locating and connection.
On 3/4/2019 11:57 PM, user9253 wrote:
| Quote: |
You can use two nuts on the bolt. The first nut holds the bolt in place on the
insulating material. The electrical ring terminals go on next followed by the
second nut. The two nuts compress the terminals together with no plastic in between.
--------
Joe Gores
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