- [Instructor] Now we have a pretty good basic enclosure,
and we're going to start adding some more advanced
features to it.
The first of these, is going to be a lip
around where the two halves join,
and this will allow them to fit together really nicely.
In a more advanced enclosure, this kind of feature
could be used as something like waterproofing,
or dust protection.
We're going to start with the top half.
So let's click on it and press Open Part.
We're going to cut away a portion of the wall,
all the way around on the inside,
and then there's going to be a corresponding lip on the
other half that fits into this cavity.
So the problem is this cut is complicated a little bit,
by the extra cutouts that we've added.
So we can simplify it by dragging the rollback bar
up above these cuts.
Hover over the blue bar at the bottom of the Feature tray,
then hold down the left mouse button,
and just drag the bar all the way above those cut features,
and then release.
So now we're adding features at this point in the model.
We can now start a sketch on this inside face,
so select that top face,
and then select Sketch.
Now select any of these inside top lines,
and then just right click on it and choose Select Tangency.
So now we've selected the entire loop of lines,
and now we can use the Offset Entities tool
to make our sketch.
So from the Sketch Tab click on the Offset Entities Tool,
and it will probably beef up to 10 millimeters,
here on the left,
you can see on the preview what we've done is offset that
selection by 10 millimeters all the way around.
We made the walls three millimeters thick, so if we change
that to 3 millimeters, we can see the offset now aligns up
with the outside of the walls.
One of the reasons we made the walls three millimeters,
was just to give us plenty of space to add these
lips and cuts without the walls getting too thin.
So lets change the offset to 1.75,
and just press Enter.
So now you can see we are going to cut a little bit
more than halfway through the wall,
but that will still leave a fair amount of wall thickness,
1.25 millimeters.
So press Okay.
So now we just have a sketch with those offset lines,
and all we need to do is go to the Features Tab and
do a Cut Extrude.
Let's do a blind cut, two millimeters downwards.
You may have to flip the direction,
we want to be cutting down into the model,
and then press Okay,
and now you can see we've got this cut
all the way around.
You can do a slow double click on the feature to rename it,
and let's call it something like Lip Cut.
And now we can just grab the rollback bar,
left click and drag it all the way down to the bottom,
and now you can see the rest of the features
are added back in.
And features like the stand-up aren't affected
by that lip cut feature because it's before them
in the feature tray.
So now you can press Control + S to save your part,
press Control + Tab to get back to the Assembly,
and if we go to a cross section here,
you can see we've now got this cavity all the way around.
And we're going to add a lip on the other half that fits
into that.
So you can close the section view,
and press Control + S for save.