Table  9-2.  Rotor  Winding  Data  (50/60  Hz) Resistance 0.390  ohms  at  25°  C Connection 1   circuit   (refer   to   fig.   9-4) Conductor 9 of AWG #16 (0.0508) Turns   per   coil 103 No.  of  poles  and  coils 4 (e)   Reverse   wound   core   so   leads   are   hori- zontal  and  bake  for  one  hour  in  forced  convection over  at  165°  C. (f)  Repeat  steps  b,  c,  d,  and  e  two  times so  that  a  total  of  three  dips  and  takes  are  performed. (g)  The  varnished  wound  rotor  core  should be   examined   for   complete   coverage,   uniform   cover- age  with  no  strings  or  beads  and  with  openings  be- tween  extended  position  of  slot  tubes  free  of  varnish, blistering  or  peeling,  and  complete  cure,  with  tack- free  surface  and  good  bonding  strength. c.  Generator  Rebuilding  (400  Hz).  Proceed  as follows: (1)  Stator   coil   winding   procedures.  See  figure 9-5   and   table   9-3,   and   perform   the   procedures   pro- vided   in   step   b   (1). (2)  Stator  dip  and  bake.  Perform  the  procedure defined  in  step  b  (2). (3)  Rotor  coil  winding. (a)   Inspect   winding   slots   for   any   sharp   cor- ners   at   edge   and   in   slot.   Clean   up   as   necessary. (b)   Examine   bore   and   determine   the   direc- tion  in  which  the  broach  passed  through  the  bore. Place  the  leads  on  the  end  where  the  broach  left  the bore.   This   is   so   the   shaft   will   be   pressed   through the  bore  in  the  same  direction  as  the  broach. (c)   Insert   slot   liners   (3)   in   the   slots   and position  with  equal  overhang  of  the  core  on  each  end. See  figure  9-6. (d)   Insert   the   coils   in   the   usual   manner. Position  the  coils  as  evenly  as  possible  on  each  end. Consult  the  coil  limit  diagram  to  be  sure  that  the two  ends  are  adjusted  to  allow  room  for  the  connec- tions,   which   must   be   within   the   coil   limit   diagram. (e)   Insert   tapered   edge   top   stick   and   drive into   position. (f)   Make   interpole   and   lead   connections   as required  by  internal  connection  diagram.  See  fig- ure  9-6. (g)  Over  each  end,  turn-wrap  20  turns  of double  glass  roving  to  provide  banding  support  of end   turns. (h)  With  double  roving,  loop  over  the  band- ing  and  connnections  and  run  on  continuous  piece  of double  roving  over  all  24  coil  ends.  Burn  all  knots with  red  hot  duck  bill  pliers. (i)  Refer  to  table  9-4  for  400  Hz  rotor winding  data. Table  9-3.  Stator  Winding  Data  (400  Hz) Type of winding No.  Of  slots  and  coils No.  of  coils  per  group Turns   per   coil Span Conductor Connection Resistance 3   phase,   dual   voltage 108   slots   108   coils 36 groups of 2 and 36 groups of 1 5 1-4 AWG #16 (0.0508) and AWG #17 (0.0453) 12/6   ckt,   (see   fig.   9-5) 0.017   ohm   at   25°   C   (T1-T4,   etc.) 9-12