- [Woman] As you can tell,
there are a lot of factors that go into mold design.
There are different types of molds, mold components,
mold box best practices, and pitfalls to watch out for.
I'm going to open this example part
so that we can look at these factors in context.
This dental case keeps in mind
all the concepts that we've reviewed so far.
This case can be molded in a simple, bi-valve mold.
As you can see, if we do a draft analysis of the case,
we'll be able to see that draft has been applied
to all sides that are perpendicular
to the direction of pull.
Green is good, red is bad, and yellow is adjustable.
I can adjust the degree of draft it's looking for here,
to make sure my model has been drafted correctly.
It looks like there isn't enough draft on my rib features.
I can adjust this by going back into the feature tree
and adjust the draft in the feature itself.
If that's difficult to do,
there's also a feature in mold tools
to add draft after the fact.
(mouse clicks softly)
Now that I'm happy with the draft analysis,
all I can see is green and red,
except for these tiny little fillets here.
But, because everything else has fillets,
I've decided that that's enough draft
for this model in particular.
But now I've noticed
that some of my wall transitions aren't smooth.
I'm gonna go into the features tab
and add fillets on these sharp edges.
I'm leaving this outer parting line edge sharp
and it'll be my parting line.
(mouse clicks softly)
I already know that the wall thickness is consistent
when I use the shell command to create this case.
Because I cared more about the outer dimensions of the case,
I created that volume first and then hollowed it out.
I'm gonna shut down the draft analysis feature,
so that we can just look at the model.
You can make the ribs slightly thinner
than the outer walls without too much warping,
but you wanna keep the ratio as close as you can.
I can see that there aren't any spindles or parts
that have super inconsistent thickness,
excepting, of course, this living hinge,
which will enable the case to open and close
with the flexibility of the plastic.
In this instance, I would model this
in this upside-down orientation
and add funnels and vents to the bottom of the case,
that way, gravity could aid my process.
In injection molding,
this would likely call for two injection sites,
one in each main mass.