The first arc of contact being equal to or greater than about 105° and the second arc of contact being at least 20° greater than the first arc of contact.
A half hour-precise clock hand position recognition ensues when a half hour contact arch (37) is assigned to each hour contact arch (34).
The contact between the first capstan belt and the first capstan defining a first arc of contact, and the first capstan belt defining a first width, a first thickness and a first length.
The contact between the second capstan belt and the second capstan defining a second arc of contact, second capstan belt defining a second width, second thickness and a second belt length.
The feed rate as the tool rolls into cut is programmed to vary in relation to an arc of engagement between a cutting surface of the cutting tool and the stock into which the cutting tool is being moved.