connecting cut out, thru two holes with different height and angle.

[ThingsField]

Hello dear Fusion 360 community,
I have two holes drilled to the center of a cylinder, the holes are at different height and at different angles. Is there a way to make a cut between these holes so that the cut is always pointed at the center of the cylinder. I need a shape
that will simulate a mill path, as if a mill starts from 1 point and ends on the second point, on its way it is always pointed in the center of the cylinder and changes only the height and the angle.

[ThingsField]

solved

[jeff_strater]

Hi @ThingsField,

I'm interested in how you solved it, if you are willing to share.  I had some ideas, but didn't have time to try them before you solved it.

Jeff

[ThingsField · Accepted solution]

Hi Jeff,
Sorry for the late answer, that is how i did it. https://knowledge.autodesk.com/community/screencast/c99f90f9-3663-4b52-9c5c-62a8f9e0795c
Best regards,

Vladimir

[jeff_strater]

very clever!  Nice solution to the problem.  Thanks for sharing that.

Jeff

[ThingsField]

You are welcome!

[TrippyLighting]

Well, @jeff_strater I've been trying to help out another user in this thread as I thought this would be directly applicable to the problem. However, I've been banging my head against the wall to actually get this to work.

Following the steps in the screencast I just cannot get the start and end spline handles to be tangential to the cylindrical surface or to the projected circles in the sketches for that matter.

What is driving the spline handles to be tangential to the cylindrical surface in this screencast ?

All I get is this:

[ThingsField]

Hi, I don't know exactly why, but to make it work you must make the intervals between the degrees smaller, in your case you have an overall of 180 deg. for the spline to follow, to make it work you must add more intervals. Try to add 1 interval for at least each 30 deg.
The smaler the intervals - the finer the spline will mach the circle.
http://a360.co/29UcDpV

[TrippyLighting]

Thanks for the help. I had not tried that!

[jeff_strater]

@TrippyLighting, sorry for the delay, it's been a busy week in Fusion-land.

The real answer to your question is:  This is an area of Fusion that is lacking - 3D sketch.  There is no easy way to constrain that spline to be tangent to the cylinder.  That is part of the "advanced 3D sketching" task that is sitting in our backlog.  The answer that @ThingsField gave will help, but simply because more sections will make the spline fitting algorithm a bit more accurate, and with enough sections, it will more or less force the spline to be more and more tangent to the cylinder.

Alternatively, you can manually edit the spline handles to get them fairly close to tangent to the cylinder.  The process is, admittedly, a little unpleasant, with all the handle activation, etc.  We are looking into reworking all those workflows.

Anyway, here is a screencast showing how to do this.

Jeff

[ThingsField]

I found an easy and fast way to constrain that shape to be tangent to the cylinder, without using the spline and in much les steps then in my previous video. I hope it will help.
https://knowledge.autodesk.com/community/screencast/9b984d72-2087-4ed7-8a7f-4c68c3de8764 

[TrippyLighting]

Brilliant !