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'[ee]: Ground Spring Contact?????'
2002\03\19@071042 by Graham North

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Hi,

I have an 11mm diameter brass tube with a small PCB running through the
middle.
My problem is, I need to get a good ground connection to the tube, which
still allows
the PCB to be removed easily if required. My idea was to use a little
spring contact
shaped something like a 'C', with one end soldered to the board, but I
can not find
anyone who makes such a thing. Does anyone know where I could purchase
anything
like that (preferably in the UK)?

Any other suggestions will be considered if anyone has any good ideas,
I'm not sure
this is the 'best' way to do this. Any ideas?

Thanks

Graham North

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2002\03\19@073903 by Alan B. Pearce

face picon face
>I have an 11mm diameter brass tube with a small
>PCB running through the middle.
>My problem is, I need to get a good ground
>connection to the tube, which still allows
>the PCB to be removed easily if required.

>Does anyone know where I could purchase
>anything like that (preferably in the UK)?

>Any other suggestions will be considered if
>anyone has any good ideas, I'm not sure
>this is the 'best' way to do this. Any ideas?


Can you put a screw through the tube? I would look at using a threaded
spacer with a screw through the PCB and another through the tube into it.
The other option is a spacer with a male thread on one end - I would secure
this end to the PCB with a nut, and then again a screw through the tube into
the other end.

Look at the RS range 222-*** e.g. 222-373 for an M3 6mm long spacer tapped
through, 6.3p each, MOQ 50, nickel plate hexagonal brass.

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2002\03\19@084838 by Dale Botkin

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On Tue, 19 Mar 2002, Graham North wrote:

> I have an 11mm diameter brass tube with a small PCB running through
> the middle. My problem is, I need to get a good ground connection to
> the tube, which still allows the PCB to be removed easily if required.

Why not just a bent bit of thin brass stock?  Bend it in a "V" shape and
solder the tip to the board.  Alternatively, maybe a short length of 11 or
12mm coil spring, mounted lengthwise so it drags on the tube wall.

Dale

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2002\03\19@085727 by Douglas Butler

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For a one off, I would consider a spring contact from a lantern battery.
For a production source any spring or stamping manufacturer should be
able to produce what you want.  You probably want a bronze spring rather
than steel, and NOT stainless if you want to solder it to the PCB.

In the USA some manufacturers are Keystone, Seastrom, Small Parts Inc.

Sherpa Doug

> {Original Message removed}

2002\03\19@092053 by Lawrence Lile
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I'd recommend using .25mm/.010" Phosphor-Bronze shim stock
(http://www.mcmaster.com) Phos-Bronze is a good spring material, readily
solderable, and also a good electrical conductor.  The little leaf springs
inside toasters (carrying 6 amps) are made of phos-bronze.  A small piece
bent like Dale sez, attached firmly to the board, would serve.  You could
surface mount solder it, and back it up with a rivet for mechanical
strength, another method would be to form some legs and solder it
through-hole.

If this is a production part, there are a number of stamping houses which
would make such a part cheaply.

--Lawrence Lile

{Original Message removed}

2002\03\19@092906 by Madhu Annapragada

picon face
Take a look at QA technology. http://www.qatech.com They have a wide range of
spring loaded board mountable contacts with unbelievable current ratings.
You can get samples from any of their distributors.

Madhu

{Quote hidden}

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2002\03\19@093125 by Graham North

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Hi Dale,

I was thinking about something similar to the "V" shape you described,
but really wanted to buy them instead of making them as this is to go
into production. You don't know where something similar could be bought
do you?

Thanks

Graham

> {Original Message removed}

2002\03\19@093130 by Graham North

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Thanks for the reply,

But sorry, I can not really make any holes in the tube for aesthetic
reasons.

Thanks

Graham

> {Original Message removed}

2002\03\19@112118 by Bob Barr

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On Tue, 19 Mar 2002 11:01:53 -0000, Graham North wrote:

>Hi,
>
>I have an 11mm diameter brass tube with a small PCB running through the
>middle.
>My problem is, I need to get a good ground connection to the tube, which
>still allows
>the PCB to be removed easily if required. My idea was to use a little
>spring contact
>shaped something like a 'C', with one end soldered to the board, but I
>can not find
>anyone who makes such a thing. Does anyone know where I could purchase
>anything
>like that (preferably in the UK)?
>

<speculation mode>

I'm not certain of the solderability of it but could you perhaps wrap
a bit of RF gasket material around one edge of the board?
It does have some compressability and, in the proper thickness, may
give you a nice snug fit that could still allow you to easily slide
the board out of the tube.

</speculation mode>


Regards, Bob

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2002\03\19@115231 by Martin Baker

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Hmmmmmm... perhaps a bit of copper desoldering wick? Wrapped around a small
rubber disc?

Or maybe a bit of braided tube shield ?

Sounds like a cute little device. Is it a 3 watt Laser in a pen? I keep
waiting....

Martin


At 08:13 AM 3/19/02 -0800, you wrote:
{Quote hidden}

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2002\03\19@120123 by Alan B. Pearce

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>Sounds like a cute little device. Is it a
>3 watt Laser in a pen? I keep waiting....

from another message with the same originator I think it is a microphone
preamplifier.

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2002\03\19@122154 by Bob Ammerman

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How about cutting a 'vee' into one end of the PC board.

The sides of the vee would be at about a 30 degree angle
to the long axis of the board.

Something like this: (used a fixed font)

|\      /|
| \    / |
|  \  /  |
|   \/   |
|        |
|        |
|        |
|        |
|        |
|        |



The two ends of a simple strip of phosper bronze about 3mm wide
and of an appropriate length and thickness would be soldered to the
two edges of the vee. The strip would stick out past the end of the
board and form a loop that would spring fit against the inside of the tube.
There would still be space above and below for any wires that had to
feed out that end of the tube.

Bob Ammerman
RAm Systems.

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2002\03\19@130735 by Brian Aase

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How about a single "finger" spring from a piece of EMC fingerstock?

> > -----Original Message-----
> > From: Alan B. Pearce [SMTP:spam_OUTA.B.PearceTakeThisOuTspamRL.AC.UK]
> > Sent: Tuesday, March 19, 2002 12:34 PM
> > To:   .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
> > Subject:      Re: [ee]: Ground Spring Contact?????
> >
> > >I have an 11mm diameter brass tube with a small
> > >PCB running through the middle.
> > >My problem is, I need to get a good ground
> > >connection to the tube, which still allows
> > >the PCB to be removed easily if required.
> >
> > >Does anyone know where I could purchase
> > >anything like that (preferably in the UK)?
> >
> > >Any other suggestions will be considered if
> > >anyone has any good ideas, I'm not sure
> > >this is the 'best' way to do this. Any ideas?

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2002\03\19@231047 by michael brown

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Bob offers:

> The two ends of a simple strip of phosper bronze about 3mm wide
> and of an appropriate length and thickness would be soldered to the
> two edges of the vee. The strip would stick out past the end of the
> board and form a loop that would spring fit against the inside of the
tube.
> There would still be space above and below for any wires that had to
> feed out that end of the tube.

Do you suppose that phosphor bronze would be that material that this "brass"
spring-wire is that I have used in repairing old clocks?  It is used in all
sorts of spring and weight driven clocks.  You can twist it around a lever
and then sort of spool it around the pivot shaft of the lever and then tie
it off somewhere.  It would then act as a spring holding against the lever.
This stuff is pretty neat, kinda behaves like music wire.  It lasts
practically forever (scores to over a hundred years) in actual use.  They
never seem to wear out, break or lose it's tension (completely unlike steel
springs).

michael brown

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2002\03\20@043502 by Graham North

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Correct Mr Holmes!

Graham

{Quote hidden}

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2002\03\20@145321 by Peter L. Peres

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I think that you need to make your own using gold plated bronze or steel
wire. A 1cm long one will not break your bank but you have to ensure that
the brass tube does not oxidize inside. This may mean silver plating or
gold plating or even carbon composition coating. By coating I mean a spot
where your spring will touch.

hope this helps,

Peter

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