[PCB_FORUM] Re: Metric database
- From: "Gary MacIndoe" <gary.macindoe@xxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Fri, 1 Apr 2005 15:45:24 -0700
Yeah, I think I've seen it before.
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 3:42 PM
-> To: icu-pcb-forum@xxxxxxxxxxxxx
-> Subject: [PCB_FORUM] Re: Metric database
->
->
-> 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
-> > -> >
-> > -> >
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