>> This is a continuation of lab 3 part 2 and 3 of the lab 3.
We start by making a copy ok of what we already have.
Part 1 basepoint will be the origin here and then making sure
that it will be copied perfectly horizontally so I turn
on the ortho toolbar, press enter after clicking on the copy
and then what we're going to do here is we are going
to rotate the cam by 15 degrees and determine the final location
of the follower for it to stay tension.
So rotate select the cam, press enter to finish the selection
and base point is the origin and 15 degrees
that rotated the cam by 15 degrees.
Next, we are going to create a vertical construction line ok
that identifies the vertical path of the follower.
Ok and I'm going to next create a circle
that is also a construction line that defines the final position
of the center of the followers.
So its center is at par 20 here and it's going to 45 units away
because the cam has to stay externally tangent
to the followers so 20 plus 25 is 45.
What we need to do now is move the location of the follower.
Select the follower, the base point is this original center
and then the second basepoint is the intersection
of the construction circle with a vertical construction line
and if you rooted it correctly the cam
and the follower should remain tangent to each other.
Let's erase the construction lines
and that will give us part 2.
For part 3 you're first going to copy what we have for part 2 ok,
press enter to end selection.
Here's the first base point, make sure that ortho is on
and make a copy to the right of the second drawing.
Press enter to finish in a copy and what we're going
to do next is the follower is going to be moved
down by 20 units, 20 millimeters ok
and as a result the cam should rotate accordingly in order
for it to remain tangent to the follower.
So move then select the follower,
press enter to finish the selection.
Ok first displacement is the center of the follower
and then move it down by saying at 0, minus 20 to indicate
that it's moving down by 20 so the follower moves down by 20.
Then we need to determine how much should the cam rotate
counterclockwise in order to remain tangent to the follower.
So of the final position it's the R100 the big arc that's
going to be externally tangent to the arc 25.
So first we put a construction circle
of radius 125 that's equal to 100 plus 25
and then another construction circle of radius 60,
the 60 is the location of the center of the R100,
the cam rotated is always going to be around that.
Now we're going to create a line from the current location
of the center of the R100 ok and I unselect ortho and then go
to the origin of the cam and then go to the intersection
of the two circles, which would be the final location
of the center of R100.
Then to determine the amount of rotation needed this is the line
for the origin of the position of the center of R100
and to the final location of the line after that rotation.
It says 21 degrees but we need to display by going
to dimension tile, modify
and then increase the angular measurements to 5 decimal cases
and if we zoom in the angle is 20.85133.tml that we need
to rotate the cam by in order to remain tangent to the follower.
So I'm going to rotate now the cam, enter,
the base point should be the origin ok
and then the angle should be as shown here 20.85133.
Enter that rotated the cam accordingly
as you can see the 2 remain tangent
at the final position we're done we just need
to erase the 2 construction circles.
The R125 and the R60 and we're done.