- [Instructor] Another oftentimes necessary step
is to create a relief along the parting edge
and that relief is used for many purposes.
Often times if you have two injection molded parts
that are coming together at the parting surface,
you want a little gap,
basically molded into the part
so it looks nice and clean.
If you try to match two edges perfectly
then things can get a little messy
or you may have a slight little overhang.
It might not be perfect.
Tolerances, shrinkage,
those kinds of things will affect the final result.
Another reason is tool shut off.
Often times you want a little groove around
that outside corner for properly shutting off on the tool
that way plastic doesn't flash out in the mold.
Remember, you're injecting plastic into the cavity,
so there's going to be a lot of pressure.
And if it's just a net face to face joining
of the core and the cavity
often times you get a lot of flash out,
and the way to clean that up is to
make sure you have a little groove on the edge
for the tools to seal off on.
So, lets get to it.
I'm going to go into my
generative shape design work bench,
and with that I'm going to make my B side,
my in work object
and I'm going to generate a couple of offsets.
So, the first offset
is going to be off of my parting surface.
Take my parting surface
and I want to make sure I'm going downward.
The thickness, how far you're going to go,
is probably going to be determined by either your tooling team
or an engineer somewhere,
they're going to tell you how big they want these gaps.
So for this I'm just going to go in here
and do an edit formula
and I'm just going to go thickness divided by two.
Hit okay.
And I'm going to do the same thing with my sweep.
I'm going to take my sweep,
right mouse click,
edit formula,
rename,
thickness,
divided by two,
make sure it's pointing in,
and okay.
Now that I have that I'm going to create an intersection
I'm going to intersect those two offsets.
Select okay,
and I'm going to hide offset number three.
Right mouse click, hide that.
With that I'm going to generate another sweep.
That sweep is going to come off of this intersect.
So, I'll go into my sweep tool,
pick my intersect,
you can see I can pick it from the tree,
pick my tooling direction,
and for this I'm going to go into edit formula,
rename parameters,
pick my draft.
I am going to change the direction for my
sweep because this needs to be open to the tool,
so I'm going to use that and I'm just going to go five and five.
With that sweep
I'm just going to trim
those two together.
Select okay and
you can see there I have a nice
and perfect little tongue and groove.
So, I just need to carve that off into the solid.
We'll go back to my part body,
right mouse click,
define and work object,
and remember we're in generative shape at the moment,
I want to go into part design.
If I try to do this splitter trim here it won't work.
So I have to switch my work benches,
go to part design,
and next to the close we have our trim,
or split
make sure the arrows are pointing to the side
that you want to keep, okay?
So you can just simply click on the arrow.
If it's pointing in the wrong direction just click
on the arrow to reverse.
I want to point to the side that I'm keeping.
Select okay, and now I'm just going to hide the surface
and my intersection.
And there you have a little tongue and groove.