- [Instructor] Now I'm going to come in
and correct the wall thickness issue.
So to do so,
I'm just going to right mouse click over one of the ribs
and center graph,
and once again I want to make the modifications
to the actual rib within the core body.
So for this,
I'm just going to double click on the pad
that made the initial rib,
and as you can see,
I have a two and a half millimeter thickness on that wall.
Now I'm just going to hit the little f of x
and I'm just going to come in here
and say divide by two.
You may have a sink ratio
or some sort of ratio that engineering is going to come up with
or the tooling people are going to give you,
and you can use that ratio to make sure
that whatever ribs that you put on the back,
doghouses, bosses,
do not surpass a specific thickness.
So it may be 1.6.
It may be half the material thickness.
It may be three-quarters of the material thickness.
Again, it depends on the material
you're going to injection mold with.
If it's a glass fill, 20, 30% glass fill,
stuff like that doesn't have a tendency to sink as much,
but if it's something a lot softer,
a bit more pliable,
maybe it's the standard nylon,
then chances are you may end up with
a lot of those depressions or witness lines
that you really don't want to see.
So in this case I'm just going to go half the thickness
for the walls.
Select OK.
You'll notice 1.25 millimeters now.
Hit OK again.
I made the modification to the actual core,
so I know I've changed this,
which means the draft is still applicable.
I really don't have to verify that.
You can if you want.
But I'm going to go back into my wall thickness,
double click on that,
and run my analysis,
turn that on again, verify this.
I want to take this down to zero.
Actually, 2.5.
I don't want anything beyond the .5.
And now when I look at it,
you'll see I do not have those areas of concern
as I did before.
I may have some here on the bosses,
but because this is coming into an edge,
I may be able to put in a little radius here
to alleviate some of those issues, as well.
So this is a no sharp edge check right over here,
and it's not really affecting things too much,
but you can see tiny little wells in here,
so you may have to go in
and again adjust the thickness,
maybe make this hole a little bit bigger
or make the B side a little bit smaller
to not have those issues.
But as you can see along the rib walls,
everything pretty much checks out
and I should not have those issues with sink.