- [Instructor] Here I want to talk about
geometric constraints inside of the sketch.
So I'm gonna activate sketch 000,
and when I go in you can see the sketch has some issues.
This isn't necessarily what I'm looking for,
so I'm gonna use some geometric constraints
to associate endpoints to one another,
tell lines, curves, arcs to be tangent
to one another and such.
Now the software itself has got some
really, really great tools for geometric constraints.
So you have an icon at the top,
but what I recommend using are the automatic pop outs.
You don't have to press anything.
You don't have to do anything
except for select the geometry that you want to constrain.
So in this case if I wanna take this endpoint
you'll notice that I make sure I get the point
and I want to go to this endpoint.
What ends up happening is I get this little pop up.
And I'm not clicking on anything or pressing on anything
except for selecting that geometry.
In this pop up it's going to give me
all of the potential constraints that I can apply.
I pick two points so what can I do with those two points?
I can make them coincident.
Coincident means point on top of point.
I can align the points horizontally.
I can align the points vertically.
I can fix the point.
And here you see I can apply dimensions as well.
In this case I just want to simply make them coincident.
Now I want to to go ahead and associate this arc
and this line to be tangent with one another.
So here I'm gonna come in, pick my line, pick my arc.
You'll notice I get that pop up once again.
As soon as I pick something that little pop up
wants to come up, that little menu.
And I go through and tell it I want it to be tangent.
So there's my tangency.
I'm gonna do the same thing on the other side.
Now here I'm gonna pick the line,
I'm gonna pick the arc.
You'll notice that I got a different menu this time.
I basically had the same type of elements
that I used last time, but I got a different menu.
And the reason behind that is notice what was selected.
You'll see that the center point was selected,
not the actual arc.
The reason behind that is when I pick a circle,
I can either pick the arc itself
or I can pick the center point.
In this case, because of the way I pick the circle,
I got the center point.
Now I'm just gonna hit the escape
on the keyboard to cancel everything out.
You'll notice that if I come over
and pick the arc from the inside,
you'll see my selection ball.
And this is the inside of the circle.
If I pick I get, by default, the center point.
I'm just gonna cancel that out,
and then I'm gonna come back up,
and now I'm gonna pick the arc to the outside.
Now you'll notice I actually got the arc.
So it's very pick sensitive.
Another way you can make sure
that you get the corrected data that you want,
maybe you don't want that center point,
you're working in a tight area,
I'm just gonna cancel that out,
is you can come up here and turn off arc center.
Remember your selection intent.
This is very important when you're picking your geometry
inside of your sketch.
If I turn that off, now when I pick my arc
it doesn't matter where I pick it from.
I will always get that arc.
Because the arc center selection intent
has been deactivated.
So that's another way you can go and get that.
Now pick those two to tell them to be tangent.
Now you just have to remember that if
you do want to pick the center point,
depending on how you're picking it,
you wanna make sure that your arc center is turned on
if you do want to pick the center point
when selecting the arc.
You just have to use that as an on off switch.
That's what all of these are.
Next I'm gonna pick this line and I'm gonna pic that line
and tell them to be equal length.
So you can see I have my equal length constraints.
I have a horizontal constraint on my bottom line.
And the next thing I want to do with this as well,
is I want to take, in this case,
I wanna take this point to my vertical axis,
and say point on curve.
And with point on curve you'll notice
that the point is on that y axis,
it's just free to move around on that axis.
So coincident means point on top of point.
Point on curve means a point on a line
or in this case a datum.
Next I want to pick this bottom line
and go down to my x axis and here I can get my colinear.
So I've got my geometric constraints in,
basically got this looking the way that I want this to look.
If I come in, hit finish,
I'm gonna go ahead and hide my first sketch,
come into my next sketch.
I now have a new sketch for us to go in and constrain.
So I'll just double click on that sketch.
And here I wanna talk a little bit about
more of the geometric constraints.
I wanna make sure that you really understand
all the different types that you have.
So, in this case I'm gonna take this line
back over to the y axis and say colinear.
Do the same thing I wanna take this bottom line
down to the x axis and say colinear.
This point, what I want to do is I want to take this point
and make it aligned to the midpoint of this line.
So when I select this line I wanna make sure
that I get that midpoint.
If I don't get that midpoint, if it's not highlighting,
you wanna make sure that it is turned on up here,
and it is.
So when I get right to that midpoint you'll see
that little red diamond that pops up
that's indicating I'm gonna get the midpoint.
So I'll come over, select my midpoint,
and with this I can say align horizontally.
So now these points, this midpoint and that point
are aligned horizontally.
I can pick this line and say I want this to be horizontal.
This one say vertical.
This one is horizontal and vertical.
So you can walk your way around that part
pretty quick and easy.
If I pick this point, once again,
if I come to the midpoint here,
I can say align vertically.
So this point is aligned to there
and aligned to there to the middle.
Other constraints that you have,
I'll just pick on a line just to give you a listing window.
Other constraints that you have,
you can see that you have constant lengths
and constant angles.
You can fix lines and points.
If I pick multiple lines you'll see,
you know, let me take a step back.
Something I should mention.
If I pick a line and I move away from that line
you'll notice the menu disappears.
And I pick another line and I accidentally move away
from that line and the menu disappears.
If I want to get those constraints back
I need to right mouse click over the top of
one of the elements that I have selected.
And you'll see here that all of the constraints
that were available in the little fly out
are still available.
You just have to right mouse click to find them there.
Now you'll notice that,
'cause I have multiple lines selected,
I have parallel, perpendicular.
Again, the equal lengths, the constant angles and lengths,
the fixed and so on and so forth.
So those are basically your geometric constraints.
If you need additional geometric constraints
that you can't find in the pop up,
if you go up to this geometric constraint tool,
you'll notice that there's all of these constraints,
there's equal radius, there's concentric.
If I go into settings you'll notice that
there's additional constraints down at the bottom.
Some people may need to make something with a bit of
a free form shape and that's where you have slope of curves,
you have things like the perpendicular to string,
so if you have an edge that you need to remain perpendicular
to or normal to you do that with this type of a constraint.
So there's all sorts of constraints that don't
necessarily come up because they're very uncommon,
most people don't use them,
(mumbles) they've gone through
and basically streamlined that as much as possible
to give you the ones that you most commonly use.