help on sheet metal script

[jaisejames]

I have modified sheet metal.py to add miter angle. but it is not unfolding. Help on this.

[looo]

I think you have to be a bit more specific. Give some information, what you want to achieve, what error message appears,...

[jaisejames]

I made some changes to wall creation. In case miter angle, it will create two faces at the bend length & part loft between both instead of extrude.

Code is given as below

Code: Select all

    if extLen > 0 :
      # calculate miter length
      seamlen = extLen * math.tan(math.radians(miterA))
      seamgap1 = gap1 + seamlen
      seamgap2 = len - gap2 - seamlen
      if seamlen :
        seamEdge = thkEdge.copy()
        # make second face for lofting
        seamFace = smMakeFace(seamEdge, revDir, seamgap1, seamgap2)
        seamFace.rotate(revAxisP, revAxisV, bendA)
        seamFace.translate(wallFace.normalAt(0,0) * extLen)
        wallSolid = Part.makeLoft([wallFace.Wires[0],seamFace.Wires[0]],True)
      else:  
        wallSolid = wallFace.extrude(wallFace.normalAt(0,0) * extLen)
      resultSolid = resultSolid.fuse(wallSolid)

[jaisejames]

pic of miter angle

sheetmetal.png (42.26 KiB) Viewed 2630 times

[easyw-fc]

I made some changes to wall creation. In case miter angle, it will create two faces at the bend length & part loft between both instead of extrude.

Code is given as below
...

miter angle could be a very nice addition...

the unfolder code is in
https://github.com/shaise/FreeCAD_Sheet ... nfolder.py

may be @shaise or @ulrich1a may have a hint

[shaise]

I agree. I will add a miter option to the to-do list...

[easyw-fc]

I agree. I will add a miter option to the to-do list...

the posted code is already working...
ATM is the unfold that is not working when a sheet metal is mitered

[UR_]

SheetMetallcmd.py produces mitering parts by makeloft

Code: Select all

wallSolid = Part.makeLoft([wallFace.Wires[0],seamFace.Wires[0]],True)

Faces of resulting part are BSplineSurfaces, which are not necessary planes.

Unfold tool will sort them out, while doing his plausibility checks.
Is this is a bad idea for a sheetmetal part?

So try to make mitering part by sweeping, this will produce plane faces, same as extrude used by sheetmetalWB

bend loft vs extrude vs sweep.FCStd

(23.89 KiB) Downloaded 56 times

[jaisejames]

Thanks for the hint. updated script is attached. we need to add some gap to work unfold.

[shaise]

Very nice! now Unfold work as well.

@jaisejames, with your permission, I will add this fix to the release.

shai