Franklin,
What part of the minimum value is misunderstood? If the requirement
states minimum 10 mils WHY are you making it 11???
Rick
>-----Original Message-----
>From: Franklin Asbell [SMTP:[log in to unmask]]
>Sent: Tuesday, March 14, 2000 12:36 PM
>To: [log in to unmask]
>Subject: Re: [TN] Etched "Notches" or "Nicks" in copper traces
>
>Steve,
>
>Keep in mind how that is worded. The requirement say's "...20% of the
>minimum value, or less."
>
>Now if the artwork require a minimum trace width of let's say 10 mils, and
>you make the trace 11 mils, the 11 mils trace is reduce by 21%, would this
>be rejectable in accordance with A-600? Or would the minimum value (i.e. 10
>mils plus or minus the allowable tolerance) be the starting point to
>subtract 20%?
>
>~finished stirring the pot, slowly walking out before things start flying~
>
>Franklin D Asbell
>Network Circuits, Inc.
>Irving, Texas 75061
>972-313-1400
>
>
>----- Original Message -----
>From: Stephen R. Gregory <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Tuesday, March 14, 2000 7:52 AM
>Subject: [TN] Etched "Notches" or "Nicks" in copper traces
>
>
>> Hi ya'll!
>>
>> I gotta board here that has a problem with the traces, it looks something
>> like this:
>>
>>
>> Nick in the Trace
>> |
>> V ___
>> ________________ ___,/ \
>> \_/ | <-------This is supposed
>to
>> be a via..
>> ______________________, |
>> \___/
>>
>> (I hope my "ascii cad" conveys what I'm trying to show) Reading the
>> IPC-A-600F at 2.10.1.1 Conductor width it says for class 2 and 3 it is
>> acceptable when;
>>
>> "Any combination of isolated edge roughness, nicks, pin holes, and
>scratches
>> exposing the base material that reduces the conductor width by 20% of the
>> minimum value or less."
>>
>> So I'm reading this correctly, if the nick reduces the trace width by more
>> than 20% of the overall trace width, it is a reject...right? This "nick"
>> seems to have been etched like this...it's at the same place on the same
>> board that's in a 4-up panel. The other 3-boards in the panel don't have
>this
>> "nick". Booger on the artwork or something huh?
>>
>> Just want to be sure...
>>
>> -Steve Gregory-
>>
>> ##############################################################
>> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>> ##############################################################
>> To subscribe/unsubscribe, send a message to [log in to unmask] with
>following text in
>> the body:
>> To subscribe: SUBSCRIBE TECHNET <your full name>
>> To unsubscribe: SIGNOFF TECHNET
>> ##############################################################
>> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
>additional
>> information.
>> If you need assistance - contact Keach Sasamori at [log in to unmask] or
>> 847-509-9700 ext.5315
>> ##############################################################
>>
>
>##############################################################
>TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>##############################################################
>To subscribe/unsubscribe, send a message to [log in to unmask] with following
>text in
>the body:
>To subscribe: SUBSCRIBE TECHNET <your full name>
>To unsubscribe: SIGNOFF TECHNET
>##############################################################
>Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
>information.
>If you need assistance - contact Keach Sasamori at [log in to unmask] or
>847-509-9700 ext.5315
>##############################################################
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################
|
