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realthunder / fcad_pcb

FreeCAD scripts for PCB CAD/CAM
MIT License
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bottom tracks issue (kv6) #58

Open easyw opened 2 years ago

easyw commented 2 years ago

hi, I have an issue in loading B.Cu tracks with the attached board stackup-issue-saved-test.zip bot-tracks-issue

realthunder commented 2 years ago

What is you command to make the track?

Also, can you please tell why layer dieletric 1 has two thickness value. What does the addsublayer thing do?

(layer "dielectric 1" (type "prepreg") (thickness 0.037617 locked) (material "106 185HR") (epsilon_r 3.74) (loss_tangent 0.02)
        addsublayer (thickness 0.087757 locked) (material "2113 185HR") (epsilon_r 4.02) (loss_tangent 0))
easyw commented 2 years ago

What is you command to make the track?

import fcad_pcb from fcad_pcb import kicad from kicad_parser import KicadPCB pcb = kicad.KicadFcad(filename) pcb.setLayer('B.Cu') pcb.makeZones(shape_type='face',thickness=0.05, fit_arcs=True,holes=True) pcb.makeTracks(holes=True) pcb.makePads(shape_type='face',thickness=0.05,holes=True,fit_arcs=True) or import fcad_pcb from fcad_pcb import kicad from kicad_parser import KicadPCB pcb = kicad.KicadFcad(filename) pcb.setLayer('B.Cu') coppers = pcb.makeCoppers(shape_type='solid', holes=True, fuse=True)

Also, can you please tell why layer dieletric 1 has two thickness value. What does the addsublayer thing do?

that was a setting from a report of a user, which replicated a failing user case in this pcb

Could you please have a look also at https://github.com/realthunder/fcad_pcb/issues/57#issuecomment-1184427087 and here https://github.com/realthunder/fcad_pcb/issues/57#issuecomment-1185511272 ?

easyw commented 2 years ago

@realthunder I forgot to add the FC version [code] OS: Windows 10 (10.0) Word size of FreeCAD: 64-bit Version: 0.21.29484 (Git) Build type: Release Branch: master Hash: 4de0e6fb198a60bd09400d64994e7aa8308b1e23 Python 3.8.13, Qt 5.12.9, Coin 4.0.0, Vtk 9.1.0, OCC 7.5.3 [/code]

realthunder commented 2 years ago

The shape making failed because the tricky hole cutting shown below. You can fix it by increasing the arc fitting accuracy like below. The default accuracy (actually tolerance) is 5e-4.

pcb = kicad.KicadFcad(filename, arc_fit_accuracy=1e-4)

image

easyw commented 2 years ago

@realthunder I tried but still in some user case I cannot solve the issue... then I tried: 1) create tracks without holes 2) create holes 3) extrude holes as solid (I had to convert holes with shape2dview, because hole wires were not co-planar..?) 4) make a cut between track faces and solid extrude holes and I got in some case an issue in the result... then I tried to change step 4) with a 'fuzzy' cut (available since OCC 7) 4) make a 'fuzzy' cut between track faces and solid extrude holes and this is giving me, ATM, always a correct result https://dev.opencascade.org/doc/occt-7.3.0/overview/html/occt_user_guides__boolean_operations.html#occt_algorithms_11a_1

Do you think it could be possible to add a cut with fuzzy option in fcad_pcb, when cutting holes?

The following results are obtained using Basic Operations and the Fuzzy ones with the fuzzy value 6e-5

realthunder commented 2 years ago

Can you please collect some files where the cut failed? I'd like to dig a bit deeper into those failure cases.

easyw commented 2 years ago

@realthunder I'm sorry but I cannot replicate the issue on other boards atm ... I need to dig deeply in my testing board folder...