The next thing to consider is the stator punchings. In
this case they will not be punched out, but will be cut out
on either a shaper or milling machine, or cut out by hand
after as much metal has been removed as is possible by
drilling. The diameter of these discs is given in the draw-
ing on Fig. 27. To make them, cut roughly out of tMt)"



y The Tesla CoU




The Interrupter




50 The Tesla Coil

iron about loo pieces 6" in diameter, with a pair of snips.
A Y hole is drilled in the centre of them and the whole number
are clamped on a mandrel between two nuts and turned
down in a lathe to $Y. Next four Y holes are. drilled as in
the figure, and a fibre tube Y ^^ external diameter and J''
internal diameter is driven in each hole. A J" stud ^Y in
length, with hexagonal nuts and |" iron washers, binds the
discs together. After tightening up the nuts the bolts can
be slightly riveted to guard against possible loosening. The
whole is clamped in a chuck and the centre is bored out to
2|" in diameter. Next the slots are cut as in the figure,
either on a milling machine or shaper or by the use of a hack
saw and file. A large bulk of the metal can be removed by
drilling.
When the stator is complete it is mounted on the pedestal
with four cap screws which screw into the bottom edge.
