A PRECISION DOUBLE ARM DRIVE

Picture 6

The follower nut and fork assembly. The pinons for the follower nut are made from high strength steel and thread into the fork. The pinions are held in place by two setscrews. The setscrews do not bear directly on the pinions as this would damage the threads. A small slug of lead is placed in the setscrew hole. This conforms to the pinion threads and allows the setscrew to be tightened to hold the pinion without damage. The fork itself is mounted on the end of the first drive arm with a fine thread steel bolt that may be adjusted for length. It is secured in the same manner as the pinions. A simple secret to high precision design is to allow for adjustment of parts and then make sure that the adjustments stay set.


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