GCode generator - drill file is mirrored

[VaclavPe]

I created following test PCB file and generated GCode. drill.gcode file is mirrored - view is from the bottom, not from the top.

[Peter Clifton (pcjc2)]

Attached test PCB is same as on Bug #1390450, no drill.code file is present in the zip. Is this the wrong test-case?

[VaclavPe (vaclavpe)]

I do not think so. I could cover more bugs with single test case. I see GCode_test_bottom-0.9000.drill.gcode inside the attached archive.

The point is that drilling is done from the bottom. As you wrote in mailing list, probably most people used BOTTOM layer for tracks and TOP layer for components in through-hole years. Mee too. Now I mainly use SMT components. They are still on TOP side - and therefore tracks are on TOP side as well.

My idea was to create two files - topdrill and bottomdrill. And user can choose which one is more suitable for him/her.

[Bert Timmerman (bert-timmerman)]

Hi VaclavPe,

I see the essential part of this report boils down as requesting to have both top and bottom drill files generated --> feature request.

Kind regards,

Bert Timmerman.

[Chad Parker (parker-charles)]

I did a test of this.

Assuming that the gcode produces the pattern contained in the png file, the top layer is exported normally, and the bottom layer is exported mirrored. Since in order to mill the back side of a board, you would have to flip the board over, this is the correct behavior.

If the gcode ouput doesn't produce the pattern in the png file, that's a problem. I'm not sure how to test for that. But assuming the png output is correct, it seems as though there is no bug here. If you want something mirrored, put it on the bottom layer. If you want something to not be mirrored, put it on the top layer.

Since this is an old report, and I don't see a bug, I'm closing it.