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March 2003

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Subject:
From:
Genny Gibbard <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 31 Mar 2003 11:27:43 -0600
Content-Type:
text/plain
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text/plain (66 lines)
Check the read_me file, or spec list that this engineer sends with the
layouts, and compare it to what some of the other engineers use, to see if
the wording is different, or specs are different.

Our read-me files are just text files included with the gerber files in the
zip file.  We follow a fairly standard format, but we can add special
instructions specific to the current project.  Maybe that's what is
happening and it either conflicts with some other instruction or it sets a
different reference for tolerances.  Maybe the standard is pre plating
dimension and this file says post plating dimension on a hole size, for
example.

Regards.

-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: March 31, 2003 11:22 AM
To: [log in to unmask]
Subject: Re: [TN] PTH clearance between pad and gnd plane


Peter,

To the best of my knowledge all boards designed by our CAD group use the
same "standards" and in this case 0.015 is the spacing.

The problems only show up on this one engineers boards and it doesn't seem
to matter what the board layout or circuit application is.

The Fab house is always the same.

Sigh!

Thanks, Phil




              Subject: [TN] PTH clearance between pad and gnd plane



Good morning,

We sometimes have a problem with PTH leads shorting to the ground plane.
The curious thing is we use the same design and assembly methods for all
our boards, but the problems only show up on one engineer's product.

What is the "recommended" clearance between a pad and the adjacent ground
plane?  Ours look to be 0.015".

TIA

Phil Nutting

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