Boolean Intersection doesn't render, AND doesn't error

simeon_theobald

I'm stuck as to where I'm going wrong with this. Everything seems to be in order, but this last boolean operation doesn't want to render.

The parts by themselves are fine, but the intersection boolean just refuses to render.

I'm sure I'm probably overlooking something simple, and would really appreciate some help to figure out what!
https://cad.onshape.com/documents/1b51a4090f4863f66bd553c1/v/1b9d56e1a6ead5f68e044f7c/e/2a4583e0752999ce4832a78f

Thanks!

steve_shubin

@simeon_theobald

Is this what you are looking for ?


https://cad.onshape.com/documents/dfebda7f7dfd6ee4331e09f2/w/1c0eb61a2ca4db04a8181995/e/647188fec5bcb8ba26f31ce3

Krz

@simeon_theobald Intersection is not Part37 vs (Part2+Part3+...+Part36) but (((Part 37 vs Part36) vs Part35) vs Part34) vs... So in fact after selecting Part37 and Part36 the result is Part36 which as Intersection with Part35 has no result.

As @steve_shubin shows: you have to take another approach.

Jake_Rosenfeld

Just to confirm here, the expected behavior of Boolean intersect is "Retain material where ALL of these parts intersect" not "Retain material where ANY of these parts intersect".  This is different from the "Intersect" post-processing option presented by solid-creating features (the tabs at the top of Extrude, Revolve, Thicken, etc), which have the behavior "Retain material anywhere that the newly created geometry intersects the merge scope"

https://cad.onshape.com/documents/a27aa79af6666946b781a452/w/96ed940969c629b1f20f5c8f/e/b052a693b7f6620b01427fdc
Boolean intersect behavior:

Intersect as a part of extrude behavior:

simeon_theobald

Thanks very much for the help and clarification. This makes perfect sense to me now.
Steve - your example demonstrates a number of 'tricks' I hadn't encountered yet, so special thanks for that!