- [Instructor] Now that we have the first component,
the bottom bracket shell, we can add this to an assembly
and we can use our initial frame sketch
to start laying out the frame.
Open this bottom bracket shell part,
and we're going to make an assembly
by going to File, Make Assembly from Part.
We now take into a new empty assembly
and you should see your part here on the left.
Make sure that's selected and then press the green tick.
And that part is now inserted,
fixed to the origin of this assembly.
You can see here on the left,
there's a small F next to it that indicates that it's fixed.
And if you try to drag it around,
it should say that it's fixed.
If you find that you can move yours around,
you can just expand the part here on the left.
Select the origin and then hold down Control
and also select the assembly origin
and then add a coincident mate.
And then we can save our assembly
as something like bike frame assembly.
Now let's recreate our 2D frame layout sketch.
If you hover over these default planes on the left
we can see that the right plane cuts
through the middle of that part.
So we're going to use this plane to start our sketch layout.
Select that plane and press sketch
and then go to Normal To view.
You can find this on this view menu here.
If you don't have this open
you can just press the Space bar and it will open.
So select Normal To.
And now we're viewing from the side
and we're drawing on that plane.
Now let's use our 2D frame layout
to make that sketch using construction lines.
You can use the diagram from the exercise files
and make the sketch yourself
or you can just follow along with this video.
It's probably easiest to sketch all of the lines first
and then add dimensions and relations afterwards.
So I'm going to get a center line,
click on the dropdown next to the line tool.
And let's start from the bottom bracket
that we already have.
So first, I'm going to draw the rear triangle,
something like this and make sure this line isn't horizontal
should be slightly angled up by this.
If you do accidentally get horizontal line,
you can always just click on it,
select the horizontal relation and then press "Delete"
and then move the line back to about the right place
and then continue adding center lines.
So the next one comes up like this.
Then there's one up from the middle of the bottom bracket.
It goes up like this.
And the top of this line finishes on that line,
but not at the end point.
Next, we can add the large wheel base line.
So this is the only one that's horizontal
in the whole sketch.
So it starts at the back here and goes off to the front
and we can continue to add lines in.
So next we've got a small line like this.
And then at the front here we've got a fork line
that goes up like this
and then another one that goes down to there.
Up here, we've got the head tube
and then we've got the down tube that goes up like this.
And then finally, we've just got another tube starts
from the top of this line
and it goes along something like this.
So again, make sure these aren't horizontal.
This should be the only horizontal one.
Now, we can start to add some relations and dimensions.
Let's add some relations first.
So let's zoom in.
Select this front line and also this line
and make those perpendicular,
and then also select this line and this line
and make those two colinear.
So they follow the same line.
Now we can start to add some dimensions.
Going to get the smart dimension tool.
We're going to start with this largest line
and it should be 1040 millimeters long.
And as you add that dimension
you'll probably see your sketch moves around a little bit.
That's all right, because we can fix that later on.
Now we can add some angles.
So the first one here is head tube.
So it was from this line to this horizontal line
and this is 71 degrees.
And then the next one is the seat tube.
So again, it's from that horizontal line,
goes up to the seat tube and this one is 74 degrees.
Then I'm just going to work from the back to the front
and start adding in some dimensions.
So this rear line is 450.
Make sure you don't get this horizontal distance.
Make sure you get the length of the line.
So you might need to move your dimension
around a little bit like this.
So we don't want this horizontal one.
We want the full length of the line
and that should be 450.
Then the bottom bracket drop here.
So it's from here to here is 50.
Then the fork right here at the front is 45.
So again, it's the length of the line
not the horizontal distance.
The fork length here is 376.
And then the head tube,
you might just need to drag these out a little bit.
So they're back in the correct position.
It's going to move these up above,
you can just take your time and go through it.
So the head tube up here is 170.
Next up, the length of the seat tube is 500.
So it's the full length of the line
not the vertical distance.
So just move the dimension around
like this and let's make this 500.
And then we can add this small dimension here, this is 30.
And then the only thing left affects is this dimension.
So I'm going to drag it up to roughly the correct place,
something like this.
And then I'm going to get smart dimension again.
And the first one to add is the actual length
of the top tube line.
So we're going to click on the line itself
and this should be 521 millimeters.
So it's the actual length of the tube
it's not that horizontal length.
So that should be 521.
And then the final dimension
to add is called the top tube effective length.
So this starts from the top of the seat tube here
and it goes forward to the front end of the top tube.
And this one is horizontal.
So there should be 530 millimeters.
And as you add this in,
it should fully define the whole sketch.
So we can see down here, it says fully defined.
So this sketch is now ready to use
with the rest of the assembly.
If you have any problems with this sketch,
if you find that some
of the numbers don't seem to work properly
then just have a really careful look over it.
Make sure you haven't got any
automatic relations by mistake.
For instance, the only horizontal line is this one.
Make sure that this line isn't horizontal, for example
and make sure that this one isn't vertical.
Sometimes you can also get parallel relations by mistake.
So make sure that this line and this line aren't parallel
and maybe make sure these two and this one aren't parallel.
If you still having problems,
then just check the all your dimensions are starting
from the correct place.
For example, this one starts from the top of the seat tube
not from the end of the top tube.
And if you're still having problems
then just go through the whole drawing really slowly
and just double-check everything from front to back.
This initial sketch can take a bit
of time to set up correctly,
but once we have it right then it will save us a lot of time
with the construction later on.
And when you finished you can exit that sketch
and let's save the assembly.