1. Make a cylinder

2. Make a cube, with the z-side longer than the cylinder

3. Move cube to the edge of cylinder

4. Use the difference() function to subtract the cube from the cylinder

$  Runsun Pan, PhD

$ libs: doctest , faces ( git ), offliner ( git ), runscad.py ;

$ tips: hash( 1 , 2 ), sweep , var , lerp , animGif

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this will do it, to regulate the angle prefectly you can make a cube that
cuts the cylinder in half and then union two half cylinders, with one
rotated 0-180 degrees to get 0-180 pie sections.

add this to windows sidebar: http://www.openscad.org/cheatsheet/

check these codes:
http://forum.openscad.org/Creating-pie-pizza-slice-shape-need-a-dynamic-length-array-td3148.html

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here is the same as the sketch with a diameter of 4mm, change one of the cube
resize values to change the notch width. check the cylinder in the manual to
change the number of vertices on it.

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