extrsion impossible

bernard_ciret

why is impossible to extrude a cylinder in the corner of a box when the base cercle is tangent to the both side ?

pourquoi est il impossible d'extruder un cylindre dans l'angle d'une boite quand le cercle de base est tangent aux deux cotés ?

NeilCooke

https://forum.onshape.com/discussion/comment/67802#Comment_67802

bernard_ciret

Yes is the same thing, but there is no solution !!!!

NeilCooke

Correct - Parasolid does not permit non-manifold geometry. You have to consider (3D printing aside) how you would manufacture it in real life? It is impossible to machine an infinitely small edge. 

bernard_ciret

n

bernard_ciret

i drew for you a box with a circle at the bottom tangent to the both side. In this case it is impossible to extrude the cylinder.

NeilCooke

I know - how would you machine this part?

larry_hawes

Interesting - did not know this.

MichaelPascoe

@bernard_ciret
If you really need the cylinder in that position, extrude it as a new part.

Or, move it slightly away from the edges so that the cylinder does not share an edge with the box.

larry_hawes

Simple thanks Michael...