Courtyard Excess for TH not applied proportional : Here are the default rules...

Mon, 17 Sep 2012 07:46:13 +0000

Author: Tom H
Subject: 560
Posted: 17 Sep 2012 at 7:46am

Here are the default rules -

Goal	Courtyard Excess	Courtyard Round	Hole Over Lead	Min Annular Ring	Min Fab Allowance	Thermal ID Over Hole	Thermal OD Over ID	Spoke Width Pct
Lead <= 0.40
Most	0.5	0.02	0.2	0.05	0.55	0.55	0.4	75
Nominal	0.25	0.02	0.15	0.05	0.45	0.35	0.25	75
Proportional	0.25	0.02	0.15	0.05	Calculated	Calculated	Calculated	75
User	0.25	0.02	0.15	0.05	0.45	0.35	0.25	75
Least	0.12	0.02	0.1	0.05	0.35	0.3	0.2	75

Lead > 0.40
Most	0.5	0.02	0.25	0.05	0.6	0.6	0.4	75
Nominal	0.25	0.02	0.2	0.05	0.5	0.4	0.3	75
Proportional	0.25	0.02	0.2	0.05	Calculated	Calculated	Calculated	75
User	0.25	0.02	0.2	0.05	0.5	0.4	0.3	75
Least	0.12	0.02	0.15	0.05	0.4	0.3	0.2	75

Courtyard Excess for TH not applied proportional : Settings are as program installed...

Mon, 17 Sep 2012 03:15:20 +0000

Author: jameshead
Subject: 560
Posted: 17 Sep 2012 at 3:15am

Settings are as program installed and not changed, i.e.

Setup and Fabrication Level is set to Proportional.

Terminals
    Throughhole
           Lead Widith <= 0.4 mm
           Lead Width > 0.4 mm

In both cases, User and Default Courtyard Excess is equal to 0.25 however no courtyard excess is applied to a axial resistor I tested and courtyard matches 3D body outline.

Withouth changing the "user" setting, i.e. as program is installed with all default .dat files:

If Setup > Fabrication Level is set to Level A then:

Terminals
    Throughhole
           Lead Widith <= 0.4 mm        User = 0.25 and Default = 0.50
           Lead Width > 0.4 mm           User = 0.25 and Default = 0.50

(should user here, above, default to 0.5 to begin with before the user alters it?)

If Setup > Fabrication Level is set to Level B then:

Terminals
    Throughhole
           Lead Widith <= 0.4 mm        User = 0.25 and Default = 0.25
           Lead Width > 0.4 mm           User = 0.25 and Default = 0.25

If Setup > Fabrication Level is set to Level C then:

Terminals
    Throughhole
           Lead Widith <= 0.4 mm        User = 0.25 and Default = 0.25
           Lead Width > 0.4 mm           User = 0.25 and Default = 0.25

(should this be 0.1 mm or has IPC-7251 changed for new revision? Tom's presentation shows SMT courtyards but not through hole specifically)

I would expect Proportional to have a courtyard excess of some value and the "proportional" only to apply to the pad size. Personally I don't use Proportional but always create A and B levels.

PCB Libraries Forum : Courtyard Excess for TH not applied proportional

Courtyard Excess for TH not applied proportional : Here are the default rules...

Courtyard Excess for TH not applied proportional : Settings are as program installed...