I’ve just submitted my first board to BatchPCB. When I got my DRCBOT email, the board looked a little different. Here’s a section of my Gerber file for the top copper layer:
http://www.doctort.org/adam/Stuff/drcinput.png
And now here is the corresponding section of the image I got back from DRCBOT:
http://www.doctort.org/adam/Stuff/drcoutput.png
Call me crazy but it looks as though there are a few tracks missing! 
Am I doing something wrong ?
Think its a bot issue - the bot currently doesn’t handle inverted drawn layers [due to the core engine used in the bot - I’m working on a rewrite for that but its low priority].
Forward your pass/fail email to dcarne at this domain, and I’ll make sure thats the case.
Cheers,
–David Carne
I dont know @ this prob in detail but may be my reply can help u.
This things can easily findout during CAM in image comparsion with orignal (customer data) to production data. And netlist comparision.
In CAM Two things was happend.
Operator deleted negative data at that portion.
In some CAM software negative data in aperture list is at last. And if u move it upwards it will became useless and what ever below it will be shown.
If you can send me data i will give u exactly what happen and make action plan to eliminate it in future.
May be it will help u
Thanks
Raj
Hi,
The issue is due to different interpretations of the gerber file format between different gerber packages. Our automated software, as well as viewmate + gerbv see the board without the negative layer, but the software we use for panelization for manufacturing sees it fine. Its an improvement scheduled to be rolled into the DRC bot sourcecode sometime in the future.
Cheers,
–David Carne
