Translations:Thread for Screw Tutorial/77/en


 * 1) First create an Archimedian spiral in the XY plane.
 * 2) Set the number of turns to 0.5.
 * 3) Set the radius to the inner radius of the thread, the outer radius will be this plus the depth of the cut.
 * 4) Set the growth to double the depth of cut of the thread.
 * 5) Part Mirror the spiral against the XY plane
 * 6) Part Union the spiral and the mirror to obtain a closed wire, shaped like a heart.