(b)  Enamel  is  to  be  cleaned  from  coil  ex- tensions.  Cleaning  is  to  start  as  near  sleeving  as possible.   Clean   a   1/2-inch   section   of   wire   end   pro- jecting   from   a   sleeving. Maximum   uncleaned   wire projecting   from   a   sleeving   section   shall   be   3   inches minimum   to   5   inches   maximum.   Wire   diameter   is to   be   reduced   a   maximum   of   5   percent.   Cleaned area  shall  have  enamel  removed  over  80  percent  of the   surface. (c)  Slot  tubes  should  be  inserted  with  over- hang  equally  divided  on  ends.  Minimum  slot  tube overhang  (distance  from  core  to  end  of  slut  tube) shall  be  1/4  inch.  Position  of  the  tubes  should  be adjusted   so   that   height   of   sides   is   equal.   (fig.   9-3) (d)   After   the   slot   tubes   have   been   inserted, insulating  tape  shall  be  placed  into  the  stator  to form   a   bridge   between   slot   tubes.   It   will   be   placed so  as  to  bridge  every  other  tooth  in  the  stator  core in  one  continuous  length  by  stringing  it  through  one slot,  crossing  over  at  the  end  of  the  slot  to  the  next slot,  back  through  and  on  to  the  third  slot,  continu- ing   until   it   is   back   at   the   starting   point.   The   start- ing  and  finish  ends  shall  be  securely  tied  together. This  bridge  is  to  restrain  the  end  turn  tie  cord. (e)   Coils   shall   be   inserted   in   slots   so   that overhanging   ends   are   equally   spaced.   Wire   bundles at  entrance  to  slot  should  be  brought  out  as  straight and  compactly  as  possible  to  reduce  side  pull  on  over- hanging  slot  tube  ends. (f)  Care  should  be  taken  to  see  that  wire  in- sulation   is   not   scratched   or   otherwise   damaged.   Coil wires  should  not  be  kinked  or  crossed  in  the  slots. Tools   inserted   into   slots   to   adjust   position   of   wires or   separators   should   be   free   from   burrs   or   sharp edges  to  prevent  damage  to  wire  or  slot  insulation. If  it  is  necessary  to  use  a  mallet  when  tamping  down wires   or   separators   in   slots,   tap   the   slot   tools   light- ly.   Heavy   pounding   will   ruin   the   insulation. (g)   After   bottom   coil   sides   are   in   the   slots, the   separators   are   wedged   in   place   with   their   over- hanging   ends   equally   spaced.   These   ends   should   pro- ject   approximately   1-1/2   inches   from   edge   of   core. The  separators  should  fit  tightly  enough  to  hold  the coils  down  in  the  slots. (h)   Phase   insulating   strips   are   placed   in   the end  turns  to  insulate  between  the  coil  groups  on  both ends  of  the  winding. These  strips  should  be  placed  so that  the  back  edge  reaches  the  ends  of  the  wedges  ap- proximately   1/2   inch   from   core.   The   strips   will   then overlap   the   ends   of   the   separators.   After   coil   ends are  properly  shaped,  trim  phase  insulating  strips  all around  so  that  1/16  to  1/4  inch  of  edge  projects  be- yond  edge  of  wires. Phase   insulating   strips   may   ex- tend  1/2  inch  beyond  wire  on  coil  outer  diameters. (i)   Top   sticks   shall   be   carefully   inserted   so that   slot   fibes   and   wire   are   not   damaged.   The   over- hanging  ends  should  be  equal  and  they  should  be  level. Top  sticks  which  are  broken  or  split  during  insertion should   be   replaced. (j)   Connections   shall   be   twisted   together and   brazed   using   brazing   alloy.   The   distance   from the  first  twist  to  the  film  coating  on  the  wire  must not   exceed   1-1/2   inches. End of connection   forming pigtail  shall  be  fusion  welded  as  much  as  possible with  addition  of  alloy. When  coil  pole  leads  and  ends consist   of   multiple   wires,   care   must   be   taken   to   in- sure   that   each   wire   is   securely   connected.   All   sharp wire   ends   or   spikes   of   solder   remaining   on   brazed joints  should  be  trimmed  off  or  flattened  down  to  pre- vent  puncturing  of  insulation  tape. (k)  When  connectors  are  used  instead  of brazing   connections,   wire   must   extend   completely through   the   connector. The  connector  should  be  lo- cated  as  close  to  the  insulated  portion  of  the  wire  as is   possible.   Connectors   must   be   applied   using   a wire   crimping   tool   --  crimping  is  not  to  be  done  us- ing   pliers,   hammers   or   other   make-shift   arrange- ments. (1)  Sleeving  must  be  positioned  to  cover  the coil  extension  from  the  coil  to  which  it  is  attached  to a  point  at  least  1/2  inch  under  two  layers  of  tape. The  sleeving  at  the  coil  end  must  be  positioned  to provide   a   minimum   of   3/8-inch   creepage   path   from the   coil   extension   to   adjacent   coils. (m)   All   connections   in   stator   winding   shall be  covered-with  sleeving,  MIL-I-3190/3.  Where  tape is wide enough to cover the uninsulated wire and extend a  minimum  of  1/2  inch  over  insulated  portion  of  wire, wrap   one   layer   of   tape   over   the   connection,   pressing the   two   adhesive   sides   together   for   approximately 1/4   inch.   The   remaining   length   of   tape   should   be long  enough  to  make  two  or  more  wraps  over  the  con- nection.   The   connection   and   any   uninsulated   part   of the  wires  adjacent  to  the  connection  will  be  covered with   three   thicknesses   of   tape. (n)  Where  the  tape  is  not  wide  enough  to provide   coverage   for   the   connection,   the   tape   shall be  wrapped  around  the  connection  such  as  to  provide l/2-inch   lap   plus   1/8   inch   (minimum).   The   overlap is  to  be  such  as  to  provide  a  minimum  of  two  layers of  tape.  The  double  layer  of  tape  is  to  extend  a  min- imum  of  1/2  inch  over  the  insulated  portion  of  wire. (o)  Stator  windings  will  be  tied  on  lead  end Only. Use  a  hitch  or  chain  stitch  tie.  Spacing  be- tween  ties  is  not  to  exceed  3  inches.  A  tie  must  be made   over   each   connection.   Tie   on   either   side   of cable  bundle  will  be  a  double  lace. Tie   must   pass through  space  between  coils  bridged  by  tape  specified under  tie  cord  bracing  (  (d)  above). — (P)  End  turns  on  opposite  lead  side  will  not be   tied.   However,   the   string   ties,   placed   on   the   in- dividual  coils  during  coil  winding  operation,  will  be left  on  untaped  coil  after  insertion,  to  help  keep wires   from   being   displaced. (q)  Refer  to  table  9-1  for  winding  data. (2)  Stator  dip  and  bake  (50/60  Hz). 9-6 Change 4