David,

 Solder mask is usually done in the negative, so that
what you see is what you don't get, and then reversed
through the magic of negative photoplotting or reversal
film on a contact frame. You will have to change your
CAD symbol library one time to reflect this but then you
will no longer need to draw slots, only lines.

Tom Martin
Sr. PCB Designer, ASE Technologies USA



Date:    Tue, 16 Jan 2001 15:38:01 -0800
From:    David Ricketts <[log in to unmask]>
Subject: Re: RF Surface mount...
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit



I use the same technique myself. The soldermask is cleared out in RF areas,
and I add soldermask dams. However, this is a very time-consuming process,
since soldermask is negative. I draw the clearances, with "slots" to create
the dams. I was wondering if you have any time-saving techniques?

David Ricketts

Pertek Engineering
Voice: 949-475-4485
Fax:   949-475-4493

mailto:[log in to unmask]

http://www.PertekEngineering.com

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------