Okay that is kind of what I ended up doing except instead of rotating the tubes I just rotated the box beneath them Then extruded both tubes, intersected them with the model and then erased the parts sticking up and the top surface of the box circumscribed by the circles. Viola I now have two holes in the box at the same correct angle. Sorry I didn't figure this out sooner from you guys examples but, I just couldn't connect the dots on this one. Thanks for all your help though. I will definitely remember this the next time I need an angled hole in a surface.

Yes, you're correct, the collision geometry covers up the hole, as MSPhysics generates convex collision for all linked faces. You can fix this by subdiving the group even into more convex sub-groups, like in the image below: [image: tHe6_TableSawCarriagetestV1.png] For more accurate convex subdivision, you can use Convexify by fredo6. But then, either way, your model will endup with multiple geometries, ruining the view. What you can do about it is have another, hidden layer, calling it "MSPhysics Collision", where all the convex subdivisions will be stored. Then have the original, non-subdivided versions of the groups be visible and set to MSPhysics->State->Ignore, so they don't interact with MSPhysics simulation. Here is how it should be: Table Saw Carriage test V1.0.skp You can enable the "MSPhysics Collision" layer to see the collision used for simulation.