Intersecting a cylinder and a rectangle?

modeling
drawings

#41

Is there a reason I’m not seeing half the conversation in this thread?


#42

Perhaps you are imagining it.
I’m only guessing because the answers are few and far between.


#43

I tried getting it finished, but the STL it makes doesn’t want to work. I tried intersecting faces but to no avail.balljoint1b.skp (724.9 KB)


#44

That’s exactly what I want to do Box. You make it look easy :slight_smile:


#45

I had issue years ago with an stl model of a boat hull that had a few faces reversed. Facet data matters.
Your model still has some rounded corners that are not tangential. not sure if that matters.


#46

It’s too late at night for me to try to explain what was wrong.
But basically, reversed faces and a mixture of groups and raw geometry.
It simply wasn’t a solid and wouldn’t export as a suitable .stl

Try this.
balljoint1box.skp (141.8 KB)


#47

An StL (“StereoLithography”) file is a triangular representation of a 3-dimensional surface geometry. The surface is tessellated or broken down logically into a series of small triangles (facets). Each facet is described by a perpendicular direction and three points representing the vertices (corners) of the triangle. These data are used by a slicing algorithm to determine the cross sections of the 3-dimensional shape to be built by the fabber.
If a face is reversed…your printer (or cnc as the case might be) probably doesn’t recognize the face as being there because the normals are absent…or hidden.


#48

@Box has been very helpful with this topic. A tip 'o the hat to you!


#49

Wow. Thank you Box. That works almost perfectly. Made a very small tweak to the mounting post and it’s running great.


#50

One more question…how would you elongate the offset? I haven’t been able to do it yet.


#51

It’s just edges and faces, geometry, grab hold of it and move it.
Adjust


#52

Was able to extend it, but twhne I went to thicken it and add a vent, it doesn’t seem to like it.balljoint1c.skp (148.6 KB)


#53

Well you had my undivided attention for a while but now I’m at sea for a few days so I only have a phone for now. Someone else will come along I’m sure.
But basically just look at the geometry and work with it. Use View/Hidden geometry to see what are single faces that you can use Pushpull on or select and move etc. It’s not a mystery, everything is made of edges and faces.


#54

It looks like maybe you push-pulled the vent a bit too far through the base?


#55

Yeah, but it should be 3mm, and for some reason, when I put that in, it goes over.balljoint1c.skp (170.3 KB)


#56

That’s because the base is only 2.8mm thick!

59%20AM


#57

Wow. How’d you get that? When I did it you can see it’s 3mm


#58

Increase the digits precision in model info units.


#59

Yep that did it. Thank you