Author Topic: Missing traces and missing insulation in Gerber viewer  (Read 2375 times)

0 Members and 1 Guest are viewing this topic.

Offline MomchiloTopic starter

  • Regular Contributor
  • *
  • Posts: 122
  • Country: de
Missing traces and missing insulation in Gerber viewer
« on: August 09, 2019, 09:29:07 am »
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:
806904-0

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:
806910-1

Even in the little preview after uploading the files to JLCPCB, everything looks right.
preview:
806916-2

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 regards
Momchilo
« Last Edit: August 09, 2019, 09:35:26 am by Momchilo »
 

Offline autotel

  • Contributor
  • Posts: 24
  • Country: cl
Re: Missing traces and missing insulation
« Reply #1 on: August 09, 2019, 09:35:19 am »
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
« Last Edit: August 09, 2019, 09:39:19 am by autotel »
 

Offline MomchiloTopic starter

  • Regular Contributor
  • *
  • Posts: 122
  • Country: de
Re: Missing traces and missing insulation
« Reply #2 on: August 09, 2019, 10:47:03 am »
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?
The 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.

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.
The 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.

Alternatively you could see what happens when you export the gerber files if that filled zone doesn't exist.
Without 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.
 

Offline iMo

  • Super Contributor
  • ***
  • Posts: 5570
  • Country: va
Re: Missing traces and missing insulation in Gerber viewer
« Reply #3 on: August 09, 2019, 01:10:27 pm »
Download the "gerbview" or "gerbv" and look at it at home..
« Last Edit: August 09, 2019, 01:13:49 pm by imo »
Readers discretion is advised..
 

Offline TheHolyHorse

  • Regular Contributor
  • *
  • Posts: 179
  • Country: se
  • You don't need to be confused, just understand it.
Re: Missing traces and missing insulation in Gerber viewer
« Reply #4 on: August 09, 2019, 04:39:26 pm »
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.
 

Offline autotel

  • Contributor
  • Posts: 24
  • Country: cl
Re: Missing traces and missing insulation in Gerber viewer
« Reply #5 on: August 12, 2019, 09:36:58 am »
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!
 

Offline Siwastaja

  • Super Contributor
  • ***
  • Posts: 9336
  • Country: fi
Re: Missing traces and missing insulation in Gerber viewer
« Reply #6 on: August 12, 2019, 09:42:08 am »
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.
 

Offline thinkfat

  • Supporter
  • ****
  • Posts: 2161
  • Country: de
  • This is just a hobby I spend too much time on.
    • Matthias' Hackerstübchen
Re: Missing traces and missing insulation in Gerber viewer
« Reply #7 on: August 14, 2019, 05:48:02 pm »
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!
Yup. 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

Everybody likes gadgets. Until they try to make them.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf