Influencing variables for the maximum winding speed are the needle stroke, the rotation angle of the stator ( number of poles ), the wire diameter and the groove channel width and the helix angle of the angularly grooved stators.
32.
The helix angle has its origin in the width of the segment used ( normally about ) and the 20-degree region of constant radius on the nose of the lobe ( this usually measures about 7 mm in circumference ).
33.
Quite commonly, helical gears are used with the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a left-handed helix of equal angles.
34.
Quite commonly, helical gears are used with the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a left-handed helix of equal angles.
35.
For shafts " crossed " at right angles, the helix angles are of the same hand because they must add to 90 degrees . ( This is the case with the gears in the illustration above : they mesh correctly in the crossed configuration : for the parallel configuration, one of the helix angles should be reversed.
36.
For shafts " crossed " at right angles, the helix angles are of the same hand because they must add to 90 degrees . ( This is the case with the gears in the illustration above : they mesh correctly in the crossed configuration : for the parallel configuration, one of the helix angles should be reversed.
37.
The maximum relative velocity is kept as low as possible by careful control of pitch to allow the blades to have large helix angles; thin blade sections are used and the blades are swept back in a scimitar shape ( Scimitar propeller ); a large number of blades are used to reduce work per blade and so circulation strength; contra-rotation is used.
38.
The toolpath is achieved either using helical interpolation ( which is circular interpolation in one plane [ typically XY ] with simultaneous linear interpolation along a third axis [ typically Z ]; the CNC control model must be one that supports using the third axis ) The cutter geometry reflects the thread pitch but not its lead; the lead ( thread helix angle ) is determined by the toolpath.
