Abd ul-Rahman Isn't this just really saying the silkscreen IS the defining factor???? IMHO the silkscreen layer should never have been used as an indicator or ultimately the real extents of a part. There really needs to be a user defined layer that will be used at the extents of a part to check part clearance. And that layer does not necesarily have to be an assembly layer. I have seen systems that define both actual part and real world clearances required for assembly/test/rework etc., and control over which rule pending level of technology required for design. And line widths really should have nothing to do with it when you are defining a clearance just center as if it were a zero width line. Only silkscreen itself should be considered for thickness itself with respect to all other features. But part clearance should be to a dimension MMC, etc not ever dealing with the thickness of a line defining it.
Bob Wolfe > The "component clearance" rule is not about the silkscreen, it merely uses > the silkscreen as an indicator of component extents. The idea is great, the > implementation fell short. We have talked about dedicating a mech layer to > a true component outline, the clearance rule would then use that layer, > looking for clearance between the outlines. There are plenty of details to > be worked out, such as tolerances -- part outlines would be drawn at MMC, > not at nominal, and the "clearance" would either be centerline or the > outline would compensate so that the outer edge of the outline trace was > the maximum possible condition.... * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
