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September 1998

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Subject:
From:
Matthew Lamkin <[log in to unmask]>
Reply To:
Matthew Lamkin <[log in to unmask]>
Date:
Sat, 26 Sep 1998 23:40:47 +0100
Content-Type:
text/plain
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text/plain (74 lines)
Stuart, I would suggest that you go through the components in your CAD
library and optimise the drill holes wherever you can, the increased number
of drill
sizes means more drilling work = more time to drill = more cost for
manufacturing the boards = more for you to pay for your boards.

Do your components really have leads that are only 3 thou different in width
?

I find that most components fit in a range of standard hole sizes and when I
am producing the Gerber files & Excellon drill files for each board I
allways do a check plot
of the drilling drawing/NC file and check to see if there are any components
that have
odd sizes.

If I find any & the components will fit in a std hole (0.8/1.0/1.3mm etc)
the I modify the board to suit & then the component in the library  for
future use.

I too have upgraded my CAD libraries (Cadstar for Windows) however I will
not use a
component for the first time from it without first checking it out in the
component editor
and ensuring that it fits in with my usual working practices & dimensions
for hole sizes/outline widths/text sizes etc.

This makes for a much easier job than having to mess around with things once
the board is completed & its causing a hassle over drill sizes etc.


-----Original Message-----
From: Stuart Chessen <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 26 September 1998 15:41
Subject: [TN] Increase number of drill sizes


>     Over the past year we have upgraded our CAD library. Each component
>     has it own pad and/or hole size in the library. I have noticed this
>     has doubled the number of different drills needed compared with
>     previous boards layout in years past . Some of the drills sizes only
>     vary by .003".
>
>     What problems is this causing for the board fab house?
>
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