It is true that the plated thru process is skipped.  But most board houses
that I have delt with carry a large stock of soubled sidded clad and not
much single sided clad.  So the single sided clad will be more expensive
since it is bought in lower quantities.  Hence, the copper still hase to be
etched on both sides.  If a board house has alot of single sided stock they
may have a lower price.
> -----Original Message-----
> From: Robert E. Griffith [SMTP:bob@JUNGA.COM]
> Sent: Monday, July 30, 2001 3:51 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: PCB Board houses
>
> The trick is probably finding a good board house that still caters to the
> single sided board market and does enough volume to take advantage of the
> lower cost.
>
> I think most board houses saw that the future of single sided boards is
> dead
> and went with new equipment and stock that assumes at least double sided.
> That new equipment is expensive up front, but allows them to crank out
> boards very cheaply and pass the savings onto you as long as they do
> enough
> volume to utilize it fully, It's quicker and easier for them to run a
> common
> (2-sided) board through their equipment and processes than to do something
> out of the ordinary - even if that out of the ordinary something is more
> simple.
>
> Now if you are building the boards yourself, it still holds true that more
> simple is less costly.
>
> --BobG
>
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On
> Behalf Of Garber, Mike
> Sent: Monday, July 30, 2001 3:34 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: PCB Board houses
>
> >         The price for PCBs will be about the same for single
> > or doubled
> > layered.  The reason is that it takes about the same amount
> > of time to make
> > a single sided board as it does to make a double sided board.
> >  Some times a
> > single sided board is more expensive because copper clad
> > board has copper on
> > both sides already which means that the board huse has to
> > remove all of the
> > copper on one side, this can take a long time.
> >
>
> Really?   This doesnt quite have the "ring of truth" to it.
> I mean.... the entire plated thru process is skipped.
> And I gotta beleive that single sided stock is cheaper
> than double sided stock.
>
> And as far as longer etching time for double sided stock....
> I dont beleive it.
>
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