- [Narrator] So I have my dieline and
my parting surface, which are
absolutely critical.
You can't design an injection molded
part without them.
Now, as far as I'm concerned,
you also need to create some parameters or
expressions and use those expressions
to drive all of the next shapes,
the various draft angles and thicknesses.
That way, if you have to make a change,
the change can be done globally
from one spot versus you trying to go in and
make several little modifications
here, there, and everywhere else and
to get to those expressions, you just
go under tools, go to expressions and
as you can see at the top it just
takes me by default into the modification or
creation of my expressions.
So the first one I want to create
is called draft.
This is going to be the driver for
all of my angled surfaces.
Come in, dimensionality, you'll see
currently is at length.
Well, this is an angled measurement.
So I have to change it from length to angle,
enter in the type that I want it to be
as far as is it a degree, a radiant,
so on and so forth and
once I have that in, I hit my apply.
Creates my expression.
I'm going to do this a couple more times and
the next one is going to be a thickness.
So I just come in here, type in thickness, two point five.
You'll notice by default it switches back over
to length and once I have the length set up,
I just hit apply and then I going to do it again.
I'm going to come in, create another expression.
This is going to be a corner radius.
The formula is going to use the thickness
as part of the actual driving element.
So I'm going to come in here and
just start typing thickness.
You'll notice just as soon as I start typing it,
because the expression already exists,
you'll see that it pops up
into my suggested expressions.
I can click on it and then
say times two, for example.
I select enter and you'll notice that,
here's my thickness times two equals five.
So there's my value, there's my draft and
down at the bottom is my actual
thickness value.
It goes by alphabetical order.
If you want to you can clean this up and
say user defined and then
as soon as I go to user defined,
you'll see that it just shows
those expressions there.
I'm going to select okay.
Something else that happens,
is a note appears in the tree.
You'll see the user expressions appear here.
Again, this is in alphabetical order so
doesn't matter how you create these or
the order that you create them in.
This just automatically orders them and
you can see that all the expressions are here.
So I can now use this as a reference
for any of my expressions or parameters
that I want to associate later on and
another nice thing, just to point out is
if I click on the expression here
this thickness, you'll see the
corner radius turns blue.
This is indicating that it's linked.
So this is a child to that.
If I click on this corner radius,
you'll notice that it's linked
back to the thickness, indicating that
this is the parent.
So, these expressions actually show you
how things are tied to one another and
using them and referencing them
over and over again really
again, this is a global thing,
Really allows you to control the shape
quite easily.