Hello, Jack!  Long time, no talk to!  Hope all is well with you an yours.

Do you have any input on this dilemma?  It's rather difficult for me to
believe that for a Level A, 12" board we need to provide 0.040" (+/- 0.020)
allowance, in addition to the electrical clearance.  As I said in a previous
post, I could do that with a hand drill.  Notice that this is not the case
for the holes that are connected to the plane, they only require half that
amount.

I hope Gary is having this investigated and is not going to drop it.  It
needs a definitive answer that will either acknowledge the error or convince
us of why it is as stated.

BTW, do you know of anywhere in the IPC specs that the clearance ring around
a thermal pad (between the ID and OD where the web segments cross) is
addressed?  The only thing I see is the minimum clearance, referenced to a
standard pad in Figure 5-18 of IPC-D-275.

Ray Humphrey
DynaCad Design Services

----- Original Message -----
From: Jack Olson <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 22, 1999 9:38 AM
Subject: Re: [DC] IPC Specs - Errors?


> Finally there is an interesting discussion that I might actually LEARN
> something from instead of the usual "beginner banter" stuff, and you are
> trying to discourage it?
>
> Join a chat board or just lurk, ok?
>
>                 -----Original Message-----
>                 From:   Tim D. Reid [mailto:[log in to unmask]]
>                 Sent:   Tuesday, September 21, 1999 2:20 PM
>                 Subject:        Re: IPC Specs - Errors?
>
>                  You can lead a horse to water, but you can also beat it
to
> death.
>
>