The pitch line is then drawn at a radius of 1.606 of the pitch from the worm axis.
The mortise spur-wheels have a diameter of 22 feet at the pitch line, with two rows of teeth, each 15 inches face.
From the portion b half the thickness of the tooth at the pitch line is obtained.
That part of a gear wheel tooth that extends beyond or outwards from the pitch line.
When two gears of equal size mesh together, the pitch line, or the pitch circle, as it isp.
