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extrsion impossible

bernard_ciretbernard_ciret Member Posts: 4 ✭
in Community Support
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 ?

Answers

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,992 image
    https://forum.onshape.com/discussion/comment/67802#Comment_67802
    Senior Director, Technical Services, EMEA
  • bernard_ciretbernard_ciret Member Posts: 4 ✭
    Yes is the same thing, but there is no solution !!!!
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,992 image
    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. 
    Senior Director, Technical Services, EMEA
  • bernard_ciretbernard_ciret Member Posts: 4 ✭
    n
  • bernard_ciretbernard_ciret Member Posts: 4 ✭
    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.
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,992 image
    I know - how would you machine this part?
    Senior Director, Technical Services, EMEA
  • larry_haweslarry_hawes Member Posts: 478 PRO
    Interesting - did not know this.
  • MichaelPascoeMichaelPascoe Member Posts: 2,821 PRO
    edited January 2021

    @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.




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  • larry_haweslarry_hawes Member Posts: 478 PRO
    Simple thanks Michael...
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