Help to make a hole through an oblect with a round surface

martin_olesen

Hi,

Is there an easy way to make a hole in an object with curved surface?
Lets say that i create a simple solid cylinder, how do i then make a hole through the cylinder from the side of the cylinder, on the round surface?
Would be great with a little video showing this...:-))

owen_sparks

I don't have a video but there are tricks.

The hole feature is clever little beast.  The sketch point does not have to touch the part you want to cut.  This means you can have a planar surface anywhere you like, put a sketch on that (maybe making use of the "use" function to project the outline of the cylinder) and then make a hole.

For a through hole all is simple, the clever bit is a counterbore.  OnS will keep projecting towards the part and only start the counterbore when it hits the part.

EDIT:- It's actually even better than that.  It will make the counterbore a minimum of the required depth as seen in the screen-grab below for the off centre hole.

I believe there's also a featurescript that will stick you a plane on the face of a cylinder too.

Owen S.

owen_sparks

Like so:-



https://cad.onshape.com/documents/bd151a62c9f05798e068cf2b/w/8db2c1531d8c94dde6634494/e/b187b030d7e1a4140774273d

Owen S.

martin_olesen

Hello Owen S,
Thank you very much for your kind reply.
I am new to Onshape, and still messing a bit around with planes....i can see that you created a plane and put a sketch on that, but how did you creeate the plane....please excuse me my question.

owen_sparks

Hi @martin_olesen

No problem.

In my example I used one of the default planes so no need to create one.

However if you need a new plane in a different place then the create plane function has many options.  The simplest is the offset plane.  See here for good demonstration:-
https://cad.onshape.com/help/index.htm#cplane.htm?Highlight=plane

Regards,
Owen S.

owen_sparks

For creating lots of planes at once this is a great tool:-
http://https//www.onshape.com/cad-blog/custom-feature-spotlight-multi-plane

martin_olesen

Thank you very much Mr Owen S, i think the key if for me right now, to get the fundamental understanding of planes, and how to define them, when i have an extruded part oblect.

owen_sparks

Sounds like a plan.  Shout if you need help.

Owen S.

martin_olesen

Thank you very much :-)

Jake_Rosenfeld

This may help: https://cad.onshape.com/help/Content/cplane.htm
It has lots of examples.