Why is my extrude failing?

mrFenyx

Hi,

I am trying to make an extrusion (removal) but I can't figure out how come it's failing. I made sure the sketch plane is the face I need to extrude and redid the sketch 5 times but it just won't work. Here is the link to the document: https://cad.onshape.com/documents/0a59b3f08b93c18a066e2384/w/163d406a4cdcf06a6e8ea2b7/e/720ea0d7f463fe51397c712a?configuration=BottomStrength%3D0.0018%2Bmeter%3BCellGap%3D0.0018%2Bmeter%3BCellWidth%3D0.008199999999999999%2Bmeter%3BDepth%3D0.25%2Bmeter%3BFBStrength%3D0.003%2Bmeter%3BSideStrength%3D0.003%2Bmeter%3BWidth%3D0.17%2Bmeter&renderMode=0&uiState=653ad188979b500e9f885084

The last action, Extrude 4, is the one that fails.

John_vd_Werff

Not shure about the root cause, but it is not the sketch, it has something to do with the boolean feature 'Combine back'.
When you move the 2 boolean features down in the feature tree below 'Extrude 4' and adjust the 'Merge scope' in the extrude features, the model works fine:

robert_scott_jr_

Hello. I suspect it fails because once you remove the entire 'pin' shape, there is no longer any face left to extrude. It looks like you are creating locating features. Perhaps after extrude 3 you could boolean, subtract (also select 'keep tools') and remove 'right side' from 'back' to create the pocket for the pin of 'right side'. - Scotty

John_vd_Werff

Not shure about the root cause, but it is not the sketch, it has something to do with the boolean feature 'Combine back'.
When you move the 2 boolean features down in the feature tree below 'Extrude 4' and adjust the 'Merge scope' in the extrude features, the model works fine:

mrFenyx

This could work but I need to have the hole a bit bigger than the pin and if I just subtract, that wpunt be the case. The weird ting is that it worker without issues on the other side... Can't understand what the difference is. 

mrFenyx

Thanks, @John_vd_Werff, this works. No idea why the combine made a mess but good catch