- [Instructor] Here we're going to discuss draft.
The draft tool is used
for adding angles or tapers to side walls.
Now, faces to draft.
What walls are going to be angled?
I'm going to pick these walls.
Now that I have those selected,
the next question that needs to be answered, remember,
the little exclamation point is asking for specific input,
you have to fulfill this
in order to allow the feature to be applied,
is, in this case, the neutral element.
The neutral element is defining at where the drafting
or the tapering or the angle face is going to injet.
Think of it as almost a fulcrum.
I have these faces here,
and when I apply the angle,
where is the angle starting from?
So it's going to hold it at a location
and that's what the neutral element is for.
If I come in here, specify my neutral element
as this bottom face,
you'll notice that it wants to apply this angle
to all of these highlighted faces.
This is the tooling direction.
So you want to point this in the appropriate direction.
In this case I want it to point up.
I'm going to exaggerate this draft bit so we can really see it
and preview.
So as you can see,
with that preview we can visualize
how the faces are going to draft.
This bottom edge is being held
and everything above it is basically shrinking in.
Select OK.
Now I'm going to double click on this,
bring it back.
Going to select within the neutral element field.
I'm going to deselect this bottom face.
And what I want to do is select its top face.
I just simply select the bottom face to deselect it.
Now that I have that middle face as my neutral element,
I'm going to preview.
What I want you to notice is, let me select OK,
that this back face here hinges at this face.
So at the top, it removed material,
at the bottom, it added material.
It increased the actual footprint of my pad.
If I look at the initial sketch,
you can see that is the initial size.
That's where we started out with our pad.
And again by picking this as my neutral element,
it's drafting out.
If I were to reverse this,
you'll see that adds material to the top
and removes material down at the bottom.
We delete that.
Another thing with the draft is,
I'm going to just apply a couple of fillets here and here.
When I go to select my draft faces,
you'll notice that when I pick the primary face,
it's more of a dark brown color,
and then the tertiary faces or the propagated faces,
are going to be a slightly lighter brown color.
This is indicating that this is what was selected,
these are all part of the chain.
Now when I go to pick my neutral element,
You'll see all of those faces are now being drafted.
Let me reverse the direction by selecting the arrow.
Preview.
And there you have a tangent propagation.
So if you have your fillets applied to the body
you'll see that the draft will automatically
pick all those tangent faces.
Now as far as drafting and filleting
and the order of operations,
again it depends on the part.
You may need to actually draft the faces
before you apply the fillet.
And the reason behind that is when I,
let me double click on this edge fillet,
I'm just going to select this edge to remove it, select OK.
You'll notice that as this is drafting up,
the radius size of this changes,
this gets smaller as it grows to the top.
Now, let me modify my draft.
I'm going to add this face as part of it.
Remember I removed that edge fillet.
Since I removed that edge fillet,
this is no longer tangent propagation.
So it stops short.
I'm going to apply a fillet on this corner now
that is a result of the drafts.
So you can see that there's a difference
between the fillet applied post draft
and a fillet applied pre draft.
So again depending upon your requirements,
what you need, you may need to apply the fillet
after the draft or you may need to apply the filet
before the draft.