Greetings,
I've spent a bit of time using Gerbv 2.6.0 over the past week to
inspect some CAM files prior to placing an order with OSHpark. Overall,
it appears to be a very good package, however I have noted a couple of
issues.
One of my board designs includes two internal power planes. Plane
layers are represented as negative data in the files generated by P-CAD
2000, a CAD package I've used for many years. Because of the way OSHpark
combines board designs to create panels, negative layer data must be
inverted as part of their process. I was provided with translated data
by OSHpark, and while all other layers appeared to be correct when
inspected using Gerbv, the plane layers did not show thermal ties
between pads connected to the plane and the plane itself. Some further
research showed that the translated plane data from OSHpark appears to
be correct when rendered by a different Gerber file viewer found on the
'net. It was also determined that the translated data appears as
expected if the "Layer -> Invert color" operation is performed. A couple
of other rendering issues related to plane data have been identified:
- Plane data render correctly as initially loaded, but not if "Layer
-> Invert color" operation is performed. Results are identical to
viewing translated file from OSHpark.
- The only rendering resolution which works with either color-inverted
plane data or translated data from OSHpark is "Fast".
As I don't know if it's acceptable to attach files to messages sent to
this list, I've placed three files on my website at the link below. One
is a PDF which describes the issues presented here and provides images
for illustrative purposes. The other two are the originally generated
Gerber file for one of my power planes and the translated data from OSHpark.
I've searched your archives and not found any previous reports of
issues similar to these. My apologies if this is a known issue or the
result of an error on my part. As it appears that the translation at
OSHpark is being performed correctly, I've determined that it is prudent
to complete my order through that outlet. The information in this
message and on my website is provided for your benefit so that you may
improve the quality of your software.
Best regards,
-- Mike --
http://tmckepsj.org/files/gerbv/index.html
--
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