Hi Andrew,
It varies, by fabricator and by the precise requirements of the
unplated holes. In a lot, or most, cases they can be drilled and plated then
left unmasked to be etched away with the other unwanted copper. The advantage
comes from all drills being drilled during the same operation, thus no
alignment issues from two separate drill operations.
The one catch would be with unplated holes where you may still want a
pad on the board. Then they have two options, do it as a second operation drill
or they pull your pad back 3 - 5 mils from the inner edge of the hole to ensure
that the whole barrel is etched away with no remnants around any portion of the
hole. Some fabricators will just do this pull back without warning and it
usually doesn't matter to most people.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
#14 - 1925 Kirschner Road,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2232 ext. 225
fax (250) 762-3374
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 28, 2006 7:45 AM
To: [email protected]
Subject: Re: [PEDA] P99se, Footprint Library editor, Unplated holes.
Aren't unplated holes stilled drilled as a post etch/plate operation, or
am just getting out-of-touch? ...
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