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- 4-24-92 9:43:35 am
-
- The XFILL utility was written to fill in the white space areas on PCB artwork
- leaving a gap (approx .05") around any existing black areas. This produces a
- crude ground plane on the PCB and also minimises the the amount of copper which
- needs to be etched off (it also looks better :^} ).
-
- XFILL was written to work with a PCB cad program called EAGLE (CadSoft) and
- requires that the program be configured for a LaserJet printer and the o/p
- saved to a file. XFILL then produces a second file which can be printed.
-
- Format: XFILL sourcefile destfile
-
- The other utility NEGJET merely reverses the LJET file to produce a negative
- of the original image. This may be desirable depending on wether a positive
- or negative resist is used during PCB manufacture.
-
- Format: NEGJET sourcefile destfile
-
- The two programs may be used together.
-
- A (very) small PCB file (TEST.JET) has been included to demonstrate the
- effects of the programs.
-
- Notes:
- ~~~~~
- We print our PCB artwork 1:1 on heat stabilised polyester film and use this
- to produce PC boards.
-
- This utility has not been tested with any other programs apart from EAGLE. It
- does however produce an ineteresting visual result and may be of use in other
- applications.
-
- The space left around existing artwork is 16 dots which is about .05" at
- 300 dpi. An earlier version used 8 dots but this was found to be too narrow.
-
- The last few (graphics) lines of the image may be lost, it may pay to "pad" the
- image a little at the bottom.
-
- It's SLOW!
-
- Because this was done to achieve a particular goal development stopped as
- soon as that goal was reached. I have had other ideas to improve it such as
- fixing the bugs, variable gap, on-screen display etc. and would welcome
- feedback, maybe I'll get back to it sometime.
-
- All the usual disclaimers apply as to taking no responsibility for the
- correct performance or otherwise of these programs or anything resulting
- from their use.
-
-
- Bruce Spedding
- IDW DSIR Ph 64+4+569-0788
- Box 31310 Fx 64+4+569-0132
- Lower Hutt Email SRGXNBS@GFV.DSIR.GOVT.NZ
- New Zealand