Create perpendicular holes in sphere

[surdu]

Hello friends,

What I want to achieve is have 4 holes, in a 90mm square pattern, perpendicular to the surface on a sphere surface.

The closest I got to my goal was using projected sketch, but the holes seems to be "drilled" straight down, instead of perpendicular to the surface:

I noticed that if I choose to create the hole directly on the surface of the sphere (without using the sketch points as guides), the hole is drilled correctly, but I have no control over hole spacing and pattern:

I also tried to project circles and then to use press/pull to create the holes, but first, it didn't work (I can't choose the projected sketch for pull/push), and second, I would prefer to use the Hole tool, as I would like to make the holes countersunk and the Holes tools helps with that a lot.

Any help would be greatly appreciated!

Thank you!

[JeromeBriot · Accepted solution]

Hello,

An idea:

You have to adjust the distance used to offset the planes.

[surdu]

Thank you very much again for your help!

I stumbled upon this myself as well, but I really would like avoid doing this for all holes (in reality, I have 16 holes, 4 on each "side" of the sphere). In the real project, I'm helped a little by the fact that I can use the projected corners as point for the reference plane, but still looks over-complicated.

I guess I will use this if nothing else better comes out.

Thank you very much for your time making the screen-cast ! Much appreciated!

[Beyondforce]

Hey @surdu ,

Here is another technique:

Cheers / Ben
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[surdu · Accepted solution]

Thank you both @Beyondforce and @JeromeBriot!

What I ended up doing is a combination of what @JeromeBriot suggested and my projection idea (see screen-cast below).

I'm really dissapointed to see that projections can't be used for tools like push/pull. I have to rethink some future steps on this project 😞

[TheCADWhisperer]

When you get something "correct" - then File>Export and Attach your *.f3d file here and I will show you how I would have modeled the geometry.