Imagine the hellish nightmare of having to actually align a threaded bolt
with its nut, in ACAD so the surfaces don't collide and the faces match. In
Inventor, threads are simply "shaded", meaning that the length of the bolt
that has threads is not quite the same color (looks striped) as the rest of
the shaft. We rarely even draw nuts and bolts in full 3D, unless they play
an integral role in the fonction of whatever contraption we're doing, not
just being a nut or a blot. When we do draw it full 3D, I NEVER draw
threads. The BOM shows bolt size, length, type, etc. so I don't waste time
futzing around with a standard part. I just add a note indicating what part
goes where with a leader. Simple, easy, fast. Besides, ACAD is famous for
not being able to "modelise" threads accurately, although I've heard they've
fixed this problem in recent releases. I haven't checked.
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