1) Does your company use standard hole size symbols across all
designs?
A) NO
2) If so, does your software accommodate this, or is it a manual
process for you?
3) If so, do your end users (design, manufacturing or process
engineers) find this to be valuable?
A) The engineers do not check thinking they will be the same.
Checking is done using DXF and prints that call out the specific ones "Mounting
holes" with a callout and do not rely on a chart.
The chart is for all non specific holes like vias, dips, discrete etc.
Cyrus Ringle CID
IPC Certified Interconnect Designer
Sr. CAD Specialist
Inter-Tel, Inc. http://www.inter-tel.com
7300 W. Boston St.
Chandler, AZ 85226
(480) 961-2263
mailto:[log in to unmask]
President of the Greater Phoenix Designers Council
Ron James <[log in to unmask]> on 03/07/2000 12:13:03 PM
Please respond to "DesignerCouncil E-Mail Forum." <[log in to unmask]>;
Please respond to Ron James <[log in to unmask]>
To: [log in to unmask]
cc: (bcc: Cyrus Ringle/Inter-Tel)
Subject: [DC] Drill symbol standardization
I would like to take an informal poll of other designers on the lists
to see how many companies use standardized drill symbols on
fabrication drawings. (i.e. always use the same symbol for .021
holes, etc, on all fab drawings for all designs.)
We changed from PCAD to Orcad a couple of years ago. In PCAD we built
the padstacks to include the symbol, so by default used a standard
symbol for each size. Orcad handles drill symbols by automatically
assigning them and creating a chart in the database (a very nice
feature from my point of view.) The symbol/size association will be
different from one design to another. Also, Orcad is limited to 46
different symbols, and we are already pushing that number of drill
sizes for our entire library. This means that if we want to use
standard symbols across all designs, we will have to bypass Orcad's
automatic symbol assignment and come up with a very manual process.
This question is being prompted by engineers who really liked the
standardized symbols, and feel that their ability to check drawings is
made significantly easier by that system. They have been burned in
the past by hole size issues and feel that such errors will be more
difficult to catch if they can no longer compare drawings at a glance
(new vs old revisions, or two unrelated designs that use the same
parts, etc.)
To sum up my questions:
1) Does your company use standard hole size symbols across all
designs?
2) If so, does your software accommodate this, or is it a manual
process for you?
3) If so, do your end users (design, manufacturing or process
engineers) find this to be valuable?
Thanks for any and all assistance. Please pardon the duplication
between lists.
Ron James, CID
UT Electronic Controls
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