MANDRELS
COLLETS
General There are two types of mandrels made, fixed and
The work-head on the 374 Router Bit Grinder uses the
expanding. The fixed mandrels are available in nominal
Hardinge 4C size. This permits collet capacity to 3/4
sizes only. The expanding mandrels are adjustable and
diameter.
permit a certain range of hole sizes for each mandrel.
ILLUSTRATION NO. 7
MIST COOLANT
DRESSING FLARING CUP GRINDING
WHEELS
Resinoid or Vitrified
A mist coolant nut is available for the router bit grinding,
Part No. 357410. The use of the mist coolant will permit a
The resinoid and vitrified grinding wheels may be dressed
better finish grind, it will extend the life of the grinding
by using diamond dressing stick or a dressing brick.
wheels and help to eliminate excessive heat build-up when
grinding cutting tools.
The use of mist coolant is
A dressing brick is best used to shape the grinding
recommended particularly when grinding spirals or cutting
wheels to various radii as needed when grinding fluted
tools with a large surface area such as shaper cutters and
router bits.
some router bits.
When using the mist coolant, direct the mist at the
point where the grinding wheel contacts the work.. Use a
light mist with ample air supply. The hardware for
mounting the mist coolant spray head is included in the kit.
Mounting is simple and flexible. See Illustration No. 31.
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