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Full text of "Modern Mechanical Engineering Vol-I"

THE TOOLS

187

point moves the two cutters
outwards simultaneously,
after which they are pinched
with the set - screws in-
serted from the front.
Variations made in these
elementary fastenings are
numerous.

Pilots  are  employed   to
centre and steady the action         „.         ^  ui ^             j^-u^.i^j

•'     t                                 Fig. 15.—Double Cutters expanded with Conical-ended

of   cutters.     A   pilot   may                                 Gmb-screw

enter a bush in the table of

a machine or receive guidance from a hole already bored.   The method is

very common in turret lathe work.   Some preceding figures show multiple-

ŁND BLEV.

SIDE EirEV.

SECTIONAL LONG.ELEV.    •
Fig. 16.—Round-nosed Cutter adjusted and
clamped in Boring Head

Richards' Cutters in Boring Heads

Fig. 18