At 05:32 PM 11/8/01 -0500, Mike Reagan wrote:

>you scare me man   thinking that you are design aircraft components and dont
>know how to use the progam     I think you better fligt test it

Knowing how to use the program is a convenience, not a necessity. The 
necessity is to know how to inspect the gerbers or films and the board itself.

Let me put it this way. If I want reliability of a pcb, I will prefer it to 
be designed by someone who knows electronics and reliability issues, but 
who is a beginner with a piece of software he uses, than by one for whom 
the reverse is true.

(I don't think Mr. Robison is designing "aircraft components." Last we 
spoke, he was designing equipment that might fly *on* a plane, but it does 
not *fly* the plane. If one of his boards fails, if I am correct, it will 
be a nuisance, not a disaster.)

In my experience, boards for hi-rel usage (for me, it has been space 
flight) are reviewed through several different stages, at least. While it 
is obviously best and safest to get the board right in the first place 
(after all, there is a statistical possibility that the later safeguards 
could all fail), the knowledge that negative planes should not go to the 
board edge is widespread. As I mentioned previously, most board houses, 
perhaps all, will already create an edge clearance if you don't put one 
there and you don't clearly specify that you *don't* want one. They have 
been dealing with gerbers with no edge clearance for years, but they have 
probably never encountered a request for planes to go to the edge.

Has anyone reading this received fabricated boards with no inner plane 
clearance? Was it from an established fabricator? (I'd be surprised if it 
*never* happened, but I would also be surprised if it was at all common.)

Abdulrahman Lomax
Easthampton, Massachusetts USA

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