Invented by Ampex in 1956, helical scan was the only method that was fast enough to record video in real time. Using two-inch tape and running at 15 ips, the going rate for tape recorders of the ...
Helical gears are cylindrical gears whose teeth are not parallel to the axis of rotation. The teeth are angled and appear as a segment of a helix. Helical gears can transmit power between parallel or ...
IT IS NECESSARY TO ENLARGE THEIR DIAMETER TO AVOID EXCESSIVE UNDERCUTTING. THE FOLLOWING EQUATIONS APPLY TO PAIRS OF HELICAL GEARS WHEN THE DRIVING PINION HAS FROM 5 TO 16 TEETH.