Instruction Manual
Section Five
the general instructions, Section Four, Part III, Page 13 to 17. Mount the
grinding wheel and collet assembly on the spindle of the machine. Check
diamond cup wheels with a dial indicator to determine if there is any face
"run-out." Check straight diamond wheels with a dial indicator to de-
termine if there is any peripheral "run-out." Do not correct for run-out
by truing the wheel. Face run-out on cup wheels can be corrected by
scraping the back of the hub. Peripheral run-out on straight wheels can
be corrected by shifting the wheel on the collet. Run-out should be re-
duced to .0005 inch before truing the wheel. Check the grinding wheel
and collet assembly for run-out periodically during use.
After the wheel has been mounted properly and trued, it should not be
removed from the collet until it is replaced.
4. Use of a mist coolant oil based or other, is desirable during the finish
grinding operations. A cutting fluid adds to wheel life, improves work
finish, and prevents over-heating and cracking of carbide.
5. Use a magnifying glass to check carbide for cracks before, during, and
after the grinding operation. If cracks are long, it may be more economical
to replace the carbide blade rather than attempt to grind away the crack.
6. When a diamond wheel is used, be certain that the spindle speed is correct
for the wheel being used. Keep stock removal and rate of table travel
low. Stock removal should not exceed .0005 inch to .001 inch per pass for
general purpose work or .00025 inch per pass where an exceptionally good
finish is required. Table traverse should be approximately 50 inches per
minute for rough grinding and between 10 to 20 inches per minute for
finish grinding.
7. After grinding is complete, recheck the teeth for cracks with a magnify-
ing glass. If any teeth are cracked, they should be replaced. Check to
see that the proper clearance has been ground and that there is no inter-
ference on the cutter body. This step is especially important when grind-
ing small-diameter milling cutters.
8. The cutting edges can be honed lightly with a diamond hand hone to break
the sharp edge slightly. This procedure will help to improve cutter life.
Grinding a Carbide-Tipped Face Mill. (BEFORE ATTEMPTING TO GRIND
A CARBIDE FACE MILL, READ THE GENERAL INSTRUCTIONS ABOVE.)
1. Cylindrically grind the periphery and chamfer with the silicon carbide
grinding wheel. NOTE: This step applies only to cutters with newly
brazed teeth and to inserted tooth cutters that have been set out or that
have been fitted with new teeth.
2. Remove any recess brazing material from behind the carbide teeth that
project from the cutter body. Leave the cutter in the workhead and the
workhead axis parallel to the grinding table. Remove the motor and belt.
Position a micrometer toothrest support behind the cutter (mounted on
the table or workhead) with a round-top blade resting against the back of
the top tooth. Set the wheel spindle axis perpendicular to the grinder
table and mount a diamond cup wheel.
3. Create a set-up similar to grinding the faces of a form relieved cutter, as
shown in Photo 63. Put the workhead (cutter) axis in the same vertical
plain represented by cup wheel face. Place the peripheral cutting face of
the tooth on this vertical centerline and make Crossfeed adjustments (ROLL-
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