: To test what was going on, I
: created a simple 'cuboid' part, then made hole in one of its faces, ie a
: blind cut with a five-sided section (as it happens).
: I then created an assembly, and assembled the cuboid part into it.
: I then created a new part within the assembly, the idea being that this I
: would fit into the hole in a certain way 9made up on the fly). Crucially,
: though, I would resize the cuboid part, and wanted to check that the
: 'insert' part resized as I expected, all fine and dandy.
: So, when I created a new part within the assembly, I selected as references
: the inside surfaces of the cuboid part's hole.
: Problem was, when I resized the cuboid part, the insert part resized not how
: I wanted it to.
How did you want it to locate or resize? If, as I suspect, you wanted the
associated second part feature to stay 'centered' on the five sided hole, then
don't pick the sides for references. Use datums for your references. But for the
hole geometry, create the smaller hole by offsetting the hole edges. That way you
get the location and the size. You could also create additional reference
in the base part which could be used as a reference, such as a construction
tangent to the sides and an axis point that could be referenced by your
second part feature. These techniqes let you use the base parts location
references with out constraining the size of the second part's geometry. There
additional techniques that can be suggested if the above doesn't quite get at the
BTW, thanks for the more complete description. To a greater extent, it lets me
"look over your shoulder".