Missing traces and missing insulation in Gerber viewer - Page 1
Forum section: electronics / beginners

author: Momchilo
author_rank: Regular Contributor
timestamp: August 09, 2019, 09:29:07 am
content: Hi,I finished almost a board. It's designed in Eagle. If I upload the exported zip archive to a PCB manufacturer like JLCPCB or PCBway, the bottom view is wrong. There are missing traces and missing insulation. The red circles are around through hole caps. They're shorted to ground.bottom layer:When I'm looking on the layers in the same viewer, the bottom copper layer is just fine. All traces are there like in Eagle and the isolation is also there.bottom view:Even in the little preview after uploading the files to JLCPCB, everything looks right.preview:What is wrong? Did I made a mistake during the gerber export or is the viewer wrong? In the first pic the board would be complete useless.Thanks for your help.Best regardsMomchilo

author: autotel
author_rank: Contributor
timestamp: August 09, 2019, 09:35:19 am
content: It looks like you have a filled zone connected, to which those vias need to be connected. Is this right?Do you want those vias to be electrically connected to the filled zone?Perhaps it has to do with this fact. For some reason it could be first doing the filled zone shape right, and then, the heat insulation is lost while printing the fab files. Maybe compare the clearance property of that filled zone with the clearance property in the design rules.Alternatively you could see what happens when you export the gerber files if that filled zone doesn't exist.Did I interpret your problem right?--later addition--As a side note, I have had files seem wrong at the manufacturer's website gerber viewer, and gotten the production fine. This was related to holes positioning though. Of course that I wrote to them before sending to manufacture to check whether the bad visualization was a problem or not

author: Momchilo
author_rank: Regular Contributor
timestamp: August 09, 2019, 10:47:03 am
content: Quote from: autotel on August 09, 2019, 09:35:19 amThe filled zone (polygon) is ground. One of the pins of a cap should be connected to the zone (ground), the other one not. I guess the missing traces and so on are based on the same conflict.Quote from: autotel on August 09, 2019, 09:35:19 amThe clearance is 2mm, so way more than the minimum in the design rules. It doesn't matter if I use the net classes with the clearance or just type the clearance in the isolate field of the polygon.Quote from: autotel on August 09, 2019, 09:35:19 amWithout the zone the traces are there. So it must be a problem/confilct with the polygon/filled zone. But I have no idea what that could cause. If I change the clearance, the clearance is increased or decreased like it should. I mean the copper layer looks good. Do you have an idea what could be the problem?I don't think this is a gerber view bug.

author: iMo
author_rank: Super Contributor
timestamp: August 09, 2019, 01:10:27 pm
content: Download the "gerbview" or "gerbv" and look at it at home..

author: TheHolyHorse
author_rank: Regular Contributor
timestamp: August 09, 2019, 04:39:26 pm
content: Yeah I wouldn't trust those online Gerber viewers that some manufacturers have. Download something else or if you have a Gerber viewer included with the PCB software.

author: autotel
author_rank: Contributor
timestamp: August 12, 2019, 09:36:58 am
content: If I had to bet, I would put my money on that the gerber viewer is displaying the layers in a way that you didn't expect. Write to the support, and then post about their response!

author: Siwastaja
author_rank: Super Contributor
timestamp: August 12, 2019, 09:42:08 am
content: gerbv from the geda project has never failed me. You can easily turn layers on/off, adjust drawing order, transparency etc., and it seems to read and render gerber files correctly.

author: thinkfat
author_rank: Unknown
timestamp: August 14, 2019, 05:48:02 pm
content: Quote from: autotel on August 12, 2019, 09:36:58 amYup. Jlcpcb has about the most shitty online Gerber viewer in existence. It is totally unfit for checking your uploads. The best I've seen so far is at Aisler.net.Gesendet von meinem Nokia 6.1 mit Tapatalk