At 10:06 AM 6/13/2002 -0400, Watnoski, Michael wrote: >When the Gerbers are generated without the 'Use Software Arcs' box >checked, parts of polygon copper pours become complete arcs where they >outline some pads. This is not a problem on the board design. These arcs >short to adjacent polygons and tracks. It seems to work OK when the box is >checked. I verified the Gerber files using Lavenier ViewMaster and LPKF >BoardMaster and they look the same. I have not checked the ASCII output of >the Gerber file yet, but I suspect that the angles of the included arc are >not generated properly. Has anyone else seen this problem?
It will be good to see the answer to Mr. Watnoski's question before going much further; I usually check the box out of long-standing habit (Tango did not even have a gerber arc output option, so all arcs were "software arcs.") There may be some problems with variants on RS-274X, as one speculation, sometimes the standard is a bit unclear, it used to be positively ambiguous on the matter of polygonal pads, which is why Protel's octagon plotting is so defective. By all means, I would look at the output code, probably by exploding the polygon on a copy of the board file, deleting everything on the board but the relevant arc, and generating gerber, comparing the Protel arc parameters with those in the gerber. The RS-274X standard is at: http://www.maniabarco.com/transdown/rs274xrevd_e.pdf Abd ul-Rahman Lomax LOMAX DESIGN ASSOCIATES PCB design, consulting, and training Protel EDA license resales Easthampton, Massachusetts, USA (413) 527-3881, efax (419) 730-4777 [EMAIL PROTECTED] ************************************************************************ * Tracking #: 604CB06782BA634EACE8C1C68843AB771FDEAB1F * ************************************************************************ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
