Construction:

The Timing Hub consists of two flanges and a pair of drive bolts. Each flange is fabricated from a steel hub and a Dupont Zytel mold. Standard hubs are steel with a black oxide finish. The Timing Hub may also be supplied with stainless steel hubs for operation in hostile environments.

The steel hubs are machined to size with pockets which accept the molded Zytel flanges. The Timing Hub flanges with the holes located about the perimeter are then secured together with the use of chrome plated drive bolts.

Positional Accuracy:

Each Timing Hub is supplied with a reference scale on the front hub providing easy location of the unobstructed holes; i.e. hole #10 and the other hole #10 are 180 degrees apart. By changing the location of the drive bolts from the #10 holes to the #9 holes, the rotational position of the output is adjusted by 2/3 of 1 degree.

The largest possible error for each adjustment is 1/2 of an increment, or 1/3 of 1 degree which results in an average positional accuracy of 1/6 of 1 degree.