FINISHING AND TESTING 



331 



on a screwed spindle of a pitch corresponding to the thickness of 

 the banding wire, is fed forward by a hand wheel, when banding. 

 At the back of the lathe the carriage has extension arms with 

 a drum for carrying the coils of wire. 



FIG. 411. Armature Banding Lathe (American General Engineering Co.). 



The motor drives through an intermediate shaft, which is 

 instantly thrown in and out by means of a coupling actuated by 

 a treadle running under and along the whole length of the bed. 



FIG. 412. Armature Banding Lathe (Neville Bros.). 



Balancing. With -ordinary types of armature, balancing for static 

 balance is sufficient; but with high-speed armatures for turbine 

 machines the dynamic balance is very important, and in the latter 

 case the armature has to be run and balanced for absolutely steady 

 running. The simplest method of adjusting for static balance is 



