288 ARMATURE CONSTRUCTION 



sufficient to cover the contour of the inside of the slot, and to 

 stand up an amount sufficient to overlap and cover the conductors 

 at the mouth of the slot. The gauge-piece on the shear can be 

 set so that all the strips are cut to exactly the same width. 



Fig. 344 shows the slot insulation in place in nearly all the slots. 

 The rings which project at each end of the armature spider for 

 supporting the end portions of the windings are taped up. In 

 small armatures, and in some of moderate size, where the end 



FIG. 343. Portable Grinder (Cleveland Armature Works). 



supports are made as a solid cylindrical shell, not being cored out 

 of skeleton structure as in Fig. 344, they are insulated by binding 

 them round with tape circumferentially, as is the case in Fig. 346. 

 At the right-hand end of Fig. 344 there is seen a flange studded 

 with projecting bolts, to which the commutator bush is bolted. 



STRIP-WOUND LAP WINDINGS. 



Fig. 346 illustrates an armature with about half the coils 

 assembled in place in the slots. A few separate coils are shown 

 in the foreground. The mounting of this armature for conveni- 

 ence in turning round is worth noting : each end of the shaft is 



