Source for .050" thick PCB?

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I want to build some components for older equipment. The boards need to
plug into old SIMM sockets and the boards that fit those old sockets are
..047" to .053" thick. Everything in PCB these days seems to be .062"
thick.

Searching likely suppliers and searching with Google only turned up .062"
in copper clad board.

Ideally, I'd like to find a PCB service that offers a deal on protos in
..050" (like the deals in .062" where you get two 2-layer boards at $30
each or two 4-layer boards at $60 each) with solder mask. However, that
seems far-fetched.

I'd be pretty happy at this point if I could just find two-sided copper
clad board in .050". If it's already resist coated, so much the better.

Thank you for any helpful or humorous suggestions.

Jeff

--
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In article <trag-0209040131470001@aus-as3-162.io.com>, trag@io.com
says...
> I want to build some components for older equipment. The boards need to
> plug into old SIMM sockets and the boards that fit those old sockets are
> .047" to .053" thick. Everything in PCB these days seems to be .062"
> thick.
>
> Searching likely suppliers and searching with Google only turned up .062"
> in copper clad board.
>
> Ideally, I'd like to find a PCB service that offers a deal on protos in
> .050" (like the deals in .062" where you get two 2-layer boards at $30
> each or two 4-layer boards at $60 each) with solder mask. However, that
> seems far-fetched.

..062" is pretty standard for some reason, but any decent board house
should be able to stack up any thickness and plane layout you want. I
fit ten layers in the "standard" .062", so four in .050" shouldn't be
too much to ask.

> I'd be pretty happy at this point if I could just find two-sided copper
> clad board in .050". If it's already resist coated, so much the better.

> Thank you for any helpful or humorous suggestions.

Not too funny, but you might also try asking on sci.electronics.design.

--
Keith
 
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In comp.sys.ibm.pc.hardware.chips Keith R. Williams <krw@att.bizzzz> wrote:
> .062" is pretty standard for some reason,

1/16 inch. Probably necessary for rigidity in the good ole
days of single-sided fiberboard with mounted vacuum tubes.
When programming was done with patch-cord!

-- Robert
 

keith

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On Thu, 02 Sep 2004 14:29:01 +0000, Robert Redelmeier wrote:

> In comp.sys.ibm.pc.hardware.chips Keith R. Williams <krw@att.bizzzz> wrote:
>> .062" is pretty standard for some reason,
>
> 1/16 inch.

Ok, 1/16" is pretty standard for some reason, ;-)

> Probably necessary for rigidity in the good ole
> days of single-sided fiberboard with mounted vacuum tubes.
> When programming was done with patch-cord!

I believe these were substantially thicker to hold the weight/torque. Of
course we no longer use phenolic boards in the computer biz either.

--
Keith
 
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Ditto.

Though, for me, these are custom boards, and I don't think one can get
custom boards in the $30 - $60 range in very low "proto" quantities.

"Keith R. Williams" wrote:
>
> .062" is pretty standard for some reason, but any decent board house
> should be able to stack up any thickness and plane layout you want. I
> fit ten layers in the "standard" .062", so four in .050" shouldn't be
> too much to ask.
>
 

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On Tue, 07 Sep 2004 13:33:26 -0400, Walt wrote:

> Ditto.
>
> Though, for me, these are custom boards, and I don't think one can get
> custom boards in the $30 - $60 range in very low "proto" quantities.

The design I'm referring to was also a prototype board. I had seven
of one design (dual processor) made and seven of a slightly different
design (much faster, though single processor). The boards were 10-layer
and about 8x11". IIRC the raw-board cost was in the low hundreds each. I
could have had any stackup I wanted, and indeed added two planes in the
middle of the project (added a few $hundred more, total). I was quite
surprised at the options available and the manufacturing costs
(engineering was expen$ive - $100/hr * MANY hours).

--
Keith