I feel it is up to the PCB Designer to deliver CLEAN data, meaning, NO
SILKSCREN ON PADS.
When I used BoardStation (Mentor Graphics) the gerber generation
automatically clipped silkscreen data that encroached onto exposed pads.
This is good.
Now in Protel, the first pass gerber generation DOES place silkscreen
onto pads, so you have to do an additional step, read the data into
CamTastic where a DRC check shows the error, then will clip silkscreen
back to the distance you set, giving you CLEAN data.
Again, it is up to me to deliver clean gerber data so as to prevent any
unnecessary ****ing matches.
Regards
TDK
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Wednesday, May 17, 2006 6:11 AM
To: [log in to unmask]
Subject: Re: [TN] Silkscreen on pads
Many CAD systems have issues with effective reference clipping and I
would estimate more than 1/2 of our clients have the no-silk rule in
either the drawing or a PCB fab spec specification. We can perform the
clipping more efficiently than most CAD systems and any issues
encountered can be spun back to the designers for verification.
Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302
Voice - 802.257.4571 ext 21
Fax - 802.257.0011
<http://www.vtcircuits.com/>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ted Tontis
Sent: Tuesday, May 16, 2006 4:12 PM
To: [log in to unmask]
Subject: Re: [TN] Silkscreen on pads
If the customer had silk on the pads in the art work and a
manufacturing note stating, "There shall be no silk screen on exposed
copper", then bare board supplier needs to take responsibility for the
problem. The bare board supplier should have contacted the customer and
said there is a problem, the art work doesn't match the fabrication
notes. That's why fabrication notes need to follow the art work to help
flag the inconsistencies or errors that tend to slip through the cracks.
Lets say the board was produced some place else and the old board
supplier caught it fixed it and didn't say a word, never happens right?
The customer would have never known that there was a problem, how do you
fix a problem you don't know exists?
Ted T.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chuck Brummer
Sent: Tuesday, May 16, 2006 2:44 PM
To: [log in to unmask]
Subject: Re: [TN] Silkscreen on pads
Rush,
Great response! Mistakes made by both parties, work together to solve
the
problem and make the situation win/win.
Chuck Brummer
3M Manufacturing Engineer
8357 Canoga Ave.
Canoga Park, CA 91304-2605
(818) 734-4930
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