Using the Rotate Tool to transform the basic sleeve pattern into Create Bell Sleeves
Firstly, I am using the images as shown in the book How to Make Sewing Patterns by Don McCunn which may be purchased from Amazon: https://www.amazon.com/How-Make-Sewing-Patterns-second/dp/0932538215.
My basic sleeve pattern that I will change to a bell sleeve:
The sleeve is divided into 6 sections using 5 divide lines. The underarm parts are kept intact and the rest are rotated. I chose 10⁰ for this exercise but you could use angles of lines or any degrees that you want to.
Because the underarm sections remain intact, I used the Point from X and Y of 2 Other Points to square down from C46 and C49:
Add dotted lines from C46 to C16, C49 to C18 and Shoulder to Elbow, using the Line Between Points tool:
Using the Midpoint between 2 points tool, place a point between C16-Elbow and Elbow-C18.
Using the Point Intersect Curve and Axis tool, select the curve at some point between C33 and C27 and then the point created above (C32). Change the line to a dotted line and the degrees to 90⁰.
I now have the sleeve set up to start rotating the pieces.
As the picture in the above-mentioned book shows, they work from the outside towards the centre, so I am going to do this as well but I'll start on the left side and then do the right side - you may do it the other way, if you wish.
(All your selected items will have a dotted square around them as above.)
(Now all your selected items will have green markings.)
Select the Point of Origin. In this case it is C46 which I would like to stay in the same place while C16 must rotate out to the left, taking all my selected points with it.
I have entered -10 because I am rotating the selection to the left.
The next section you will choose the curve between C46-C36, C29c1-C46, C46, C29c1, C9c1, C11c1, C16c1, C16 and C32.
Press Enter. Select C36 as the axis and enter -10⁰.
The next section you will choose the curve between C35-ShoulderTip, C46c2-C36, C29c1c2-C46c2, C36, C46c2, C29c1c2, C9c1c2, C11c1c2, C16c1c2, C16c2, C32c2, C32 and elbow.
Press Enter. Select Elbow as the axis and enter -5⁰.