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Why is my Extrude - Remove failing?

I have a sheet metal part that I am unable to extrude-remove material from the flanges.  I think OnShape is trying to tell me what is wrong but I don't get it.  I have extrude-removed holes and fillets on flanges in other drawings with success but using the same process here is giving me an error this time.

Work Flow:
Sketch footprint on front plane.
Extrude sketch to make 3D part.
Convert to Sheet Metal Part.
Create plane on flange and sketch area to be removed.
Extrude remove  <-- Fails but shows a red/orange line like when a collision is detected.
https://cad.onshape.com/documents/e628773a7d7cc074e2a843e7/w/8da972ab8b79fd289a411b2b/e/370551b32a153bb4f24c9476


Any suggestions?  Thanks for whatever help you can offer.

Cheers

Best Answers

Answers

  • Brooke_BohlkenBrooke_Bohlken Member, Onshape Employees Posts: 3
    edited March 2017 Accepted Answer
    Hey @sean_eberhart476,

    I would suggest extending the sketch past the edges of your sheetmetal part. Doing this should let you extrude remove- just make sure you extrude a distance equal to the thickness of your sheetmetal if you want to remove material from that side only. You can use a global variable for that if you'd like.

    Take a look at sketch 2 to see what I meant: https://cad.onshape.com/documents/3a881554e7e4c51393a4f156/w/ff94f03e639ee3d8ca5ed90d/e/c0ec76f4aa68d315b8fc3ba3


  • sean_eberhart476sean_eberhart476 Member Posts: 3
    @Jason_S & @Brooke_Bohlken
    Thanks for the workarounds.  I'm really looking forward to the next evolution of sheet metal tools.  Thanks again to both of you!
  • andrew_klugandrew_klug Member Posts: 3
    Any plans to allow negative extrude at a joint? The sheet metal tools are amazing but this seems to be the one weak spot that keeps hanging me up.
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 3,113
    @andrew_klug can you share an example?
  • andrew_klugandrew_klug Member Posts: 3
    NeilCooke said:
    @andrew_klug can you share an example?
    Sure the attached picture showed a negative extrusion through a sheet metal part (grey). Then I extruded another part (blue) through it so the two will lock together. When I try and negative extrude a rectangle or create a tab at the but joint line (yellow) it wont work. Move 1 mm away and no problem. This part is just 1 example. Same issue initially described in this thread. 
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