100 



BELL SYSTEM TECHNICAL JOURNAL 



diagram, Fig. 7, show the horsepower requirements for taking up wire of 

 different sizes. 



5000 10,000 15,000 20,000 25,000 30,000 



DRAWING SPEED IN FEET PER MINUTE 



Fig. 5 — Stresses produced in wire and takeup reel at various wire drawing speeds 



Power Requirement 



The horsepower required to overcome bearing friction was calculated 

 and is constant for all sizes of wire. The windage is governed by the 

 design of the reel and the horsepower was determined by test for the mini- 

 mum and maximum reel speeds. The data for these components are 

 shown by the upper curves of diagram, Fig. 7. 



