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
permit a certain range of hole sizes for each mandrel.
ILLUSTRATION NO. 7
DRESSING FLARING CUP GRINDING
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
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.