[PCB_FORUM] Re: Metric database
- From: "Gary MacIndoe" <gary.macindoe@xxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Fri, 1 Apr 2005 16:09:13 -0700
Thanks again Bobby.
Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado
-----Original Message-----
From: Mosley, Bobby [mailto:bobby.mosley@xxxxxxxxxxxxxxxx]
Sent: Friday, April 01, 2005 3:57 PM
To: 'icu-pcb-forum@xxxxxxxxxxxxx'
Subject: [PCB_FORUM] Re: Metric database
They average between .1 mm (4 mil) up to 3 mm (118 mil), anything larger I
look at using fill to make the connections. You do get a warning if the
artwork accuracy is not one place higher than the data base.
Bobby Mosley CID
503 685-3209
360 901-1573
bobby.mosley@xxxxxxxxxxxxxxxx
-----Original Message-----
From: Gary MacIndoe [mailto:gary.macindoe@xxxxxxx]
Sent: Friday, April 01, 2005 2:43 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Metric database
Thanks for the response Bobby. So you set up your database in
Millimeters with an accuracy of 3, sometimes 4? So what are the typical
trace widths you work with, .075, .100?
Thanks again.
Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado
-----Original Message-----
From: Mosley, Bobby [mailto:bobby.mosley@xxxxxxxxxxxxxxxx]
Sent: Friday, April 01, 2005 3:29 PM
To: 'icu-pcb-forum@xxxxxxxxxxxxx'
Subject: [PCB_FORUM] Re: Metric database
We do all our designs in metric.
Bobby Mosley CID
503 685-3209
360 901-1573
bobby.mosley@xxxxxxxxxxxxxxxx
-----Original Message-----
From: Gary MacIndoe [mailto:gary.macindoe@xxxxxxx]
Sent: Friday, April 01, 2005 1:45 PM
To: Allegro Forum
Subject: [PCB_FORUM] Metric database
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?
We use Millimeter
- What did you set the "Accuracy" to? (maybe 3 for Millimeter, 0
for Microns?)
3 places on most designs, for designs with dense BGA's we use 4 (not
sure why we just do)
- How about the Artwork Parameters, "Output units" can only be set
to Inches or Millimeters?
4 places in Millimeters.
- Anything else about working and creating output in a Metric
database I should know about?
Nothing comes to mind, it does take a while to wrap your brain
around it.
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
Advanced Micro Devices, Inc.
Longmont, Colorado
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