From: "Chris \"Zap\"" <[EMAIL PROTECTED]> Subject: Re: .047" Thick Copper Clad Board for PCBs Date: Fri, 26 Aug 2005 20:46:15 -0400As an addition, I have looked into PCB prototyping and the 4pcb.com deal, as well as others, and they seem to actually be quite a good deal for what they offer. I wouldn't think it would take much work to lay the board out with their software if they want a specific format, but they may limit you to one usable item per board, aka... not putting 10 SIMMs on one board. So, you end up with 3 prototypes, and you can order more with greater variable specifications, and without any tooling costs. I can't see how trying to do it all yourself would be better than using even a lower end boardhouse. Obviously, a normal boardhouse will give you a real, 100% item, but is that necessary for what is being made? It should still work either way, and if the lesser cost means that it actually happens, then why not?
The problem with the prototype services is that they are very restrictive in their specifications, and one of those restrictions is that the board will be .062" thick.
So, if you were making a ROM DIMM for the x100 PowerMacs, x500s or Beige G3, e.g., the proto services would be fine, because those boards are .062" thick. But for SIMMs in our old Compacts and in the vintage machines, you need .047" and the affordable proto services won't do .047". You must pay for the full-service PCB builds to get non-.062" board.
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