why cant I select this plane?

[ckVCFWD]

working in sheet metal,  I want to sketch on the thin surface like I did on the rest of this piece but for some reason, the softest part of this curving sheet metal cant be drawn on? video attached. you can see I can select any other surface as a plane to draw on except the one I want?

[davebYYPCU]

If you can’t select it, it is not a Plane.  Most likely it’s twisted.

Might help….

[ckVCFWD]

its not, or there is no reason for it to be. it was a simple curved line, then flanged to extrude it, every other face that is parallel to the face I cant select is from the same extrusion operation, and they all can be drawn on, selected, and cut/extruded.

[davebYYPCU]

Then it is twisted because you cut a curved flange with the extrude.

Might help...

[ckVCFWD]

I did?  I dont see how. this is it right here. I dont see any twist.

[davebYYPCU]

Optical illusion.  If you cannot sketch on the first extruded curved face, then it is unusual.

Might help...

[ckVCFWD]

ok, so its a bug? or im being optically alluded?

[g-andresen]

Hi,

Please share the file for reply.

File > export > save as f3d on local drive  > attach to post

günther

[ckVCFWD]

here it is, very curious what im doing wrong

[HughesTooling]

Seems to be a problem with using splines for a sheet metal flange. If you replace the spline with an arc it work as expected. @Phil.E  who would be best to tag in about problems with sheet metal

[Phil.E]

Thanks @HughesTooling . For sheet metal, I'm happy to look at issues, or you can tag @samuel.templeUCPAE for sheet metal specific issues. Either way, it'll get to the right people.

This does look like a case where splines are creating issues for that edge. Use arc or put a construction plane on that face (use 3 points or other method). Sorry for the inconvenience in the mean time.

[samuel.templeUCPAE]

Thank you for reporting this. I will be speaking to my development team about this and hopefully get an explanation as to why this may be the case.

[samuel.templeUCPAE]

A ticket has been created to investigate this issue further.
I believe this is an issue with sheet metal and splines. I left the spline rather than swapping it with an arc, then i used thin extrude, and i was able to use the top edge as a sketch plane.

FUS-159161