[PCB_FORUM] Re: Metric database

  • From: Kevin McCowan <kmccowan@xxxxxxxxxxxxxx>
  • To: icu-pcb-forum@xxxxxxxxxxxxx
  • Date: Fri, 01 Apr 2005 17:41:59 -0500

I believe if it is too low allegro will "remind" you
that rounding errors could occur.

Kevin

Gary MacIndoe wrote:
Thanks for the response Kevin.  I'm about to do a trial output, I guess it
will let me know if the accuracy is set too low.

Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado




-> -----Original Message----- -> From: Kevin McCowan [mailto:kmccowan@xxxxxxxxxxxxxx] -> Sent: Friday, April 01, 2005 3:29 PM -> To: icu-pcb-forum@xxxxxxxxxxxxx -> Subject: [PCB_FORUM] Re: Metric database -> -> -> Everything works. -> Just set the units as you want to see them and -> make sure that the accuracy is enough to match -> whatever you choose for your gerber output. -> I was going to do this several (maybe 10) years ago -> when I worked for NASA but when I called the board -> manufacturer they said "Sure, we can convert that." -> I decided I didn't want them to "convert it" so I -> never switched. It has never been a problem. -> You should call your board house, though. It -> never hurts to get their input. -> -> Kevin McCowan -> Sr. PCB Designer -> TSI Telsys -> -> Gary MacIndoe wrote: -> > Ok, now for something completely different... -> > -> > Has anyone set up a design in metric, and sent it out to Fab? Some -> > questions: -> > -> > - Did you set the "User Units" to Millimeter or Microns? -> > -> > - What did you set the "Accuracy" to? (maybe 3 for Millimeter, 0 for -> > Microns?) -> > -> > - How about the Artwork Parameters, "Output units" can only be set to -> > Inches or Millimeters? -> > -> > - Anything else about working and creating output in a Metric -> database -> > I should know about? -> > -> > -> > I have started with the database set up in Microns in order to have -> > whole number trace widths (75 and 100). If I switch to a Millimeter -> > database, the trace widths become .075 and .100 (I guess I -> could handle -> > the less than whole numbers). -> > -> > Anybody have any suggestions about this? -> > -> > Thanks for any help! -> > -> > Gary E. MacIndoe -> > PCB Design Engineer -> > *A*dvanced *M*icro *D*evices, Inc. -> > Longmont, Colorado -> > -> > -> ----------------------------------------------------------- -> To subscribe/unsubscribe: -> Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx -> with a subject of subscribe or unsubscribe -> -> To view the archives of this list please login at -> //www.freelists.org. Our list name is icu-pcb-forum -> or go to //www.freelists.org/archives/icu-pcb-forum/ -> -> Problems or Questions: -> Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx -> -> Want to post a job listing ? DON'T DO IT HERE! -> Better yet, join our jobs listing forum. -> -> SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx -> POST: icu-jobs-forum@xxxxxxxxxx -> ----------------------------------------------------------- -> ->


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