same flange different results?

rob_field

I have two parts (basicaly the same) with the same flange detail on them. The fist one (orange) worked perfectly. The second one does not want to play ball at all. The program is putting a bend relief on the bottom that's not there in the first one and when I go to remove the profile through extrude/remove it tells me the sheet metal model can't be constructed even though they are the same prfile draw in the same way on each part.

 

David_YL_Nguyen

Hey @rob_field,

Could you share a link to your (public) document so people can have a look at it?
Might have have to do with the default bend relief settings of your sheet metal parts. Cheers

rob_field

That was my first thought also but from what I can see they are the same for all parts.

https://cad.onshape.com/documents/e9f4f784a7fbf6870c120146/w/fa0224be6e9a96a2a37bb071/e/786a3968d6bee75a57bb00b2?renderMode=0&rightPanel=sheetMetalPanel&uiState=651bdbce5566ab3bf80b3675

John_vd_Werff

Extrude isn't working because the sketch face interferes with the corner relief (those sheet metal corners are tricky in Onshape):

As @David_YL_Nguyen pointed out, the bend relief is set in feature 'sheet metal model 5'. Set it to 'Tear' to remove the bend relief.

rob_field

I moved one sketch vertex and the remove now works but I still have the issue of the bend relief at the bottom of the flange. I changed the model setting to tear which got rid of the small radiused cut out but is still chopping off the flange.

 

David_YL_Nguyen

Hey @rob_field,

It seems that the difference in the angle is triggering the different behaviour of the bend relief. Sometimes, Sheetmetal Design seems more like art than science, independent of the software that it is done in.

I have created a few options (test 1-3) for you to choose from how you could prepare that corner, hope you like one of them. I think my personal preference is probably the clean 90deg profile and a clean bend, I think in reality this does probably not turn out as clean as in design. 

https://cad.onshape.com/documents/263b8f5e91e687021c2921ef/w/c0d5e58fbf336ce5de9986f9/e/98d648ab2a3c61cf53c20c18





I would also suggest to prepare your model already have the initial sheet metal modal free of errors (collision in flat pattern). I have tried splitting the face, there might be better ways to do this.



Hope this helps. Any questions, let me know. Cheers

bryan_lagrange

This is the closest I could get it

https://cad.onshape.com/documents/02088c1d094e92ac4b4d243e/w/f38a83d23838bd02752bf454/e/96d8158b290ec5c6c6123316