Gai,
Thanks for trying to help a newbie to you and all. However your answers are not detailed enough to work. Lets take this a step at a time. I downloaded your example so I have on my screen the oval cylnder.
You wrote:
-
make a flat plane at 90 degrees ---> How do you do this? 90 degrees to what axis??
-
position where you want the cut - use "move" tool.
Gave up on step 1 and used your pre-made oval shape. First question: position what? the Move cursor I assume you mean. OK, I positioned it on lower right corner of the shape and clicked once. I get strange actions here. Sometimes it does nothing, or leaves a point or forces the shape to expand or contract when I move the mouse, etc. Junk.
-
Rotate to desired angle - use the rotate tool.
The rotate tool gives me a protractor with angles listed in lower right hand corner of screen. Now I click when the cursors says "on edge" since I want to section in a vertical plane. Then the cylinder shape just tumbles randomly when I move the mouse.
I give up. This is not an easy tool to use at all.
I can draw this easily in Visio but it is 2D. Attached is another description of the problem.