Instruction Manual
Section Five
CHAPTER 14
Special Operations and
Miscellaneous Tool Grinder Set-Ups
I. CYLINDRICAL AND FACE GRINDING OF CARBIDE MILLING CUTTERS
A. Equipment Required:
1. Motorized Workhead (see Section Six, Part III, Pages 99 and 100)
2. Grinding Wheels:
(a) Roughing wheel for circle grinding. We recommend a 6 inch diam
eter silicon carbide straight or recessed wheel,
V*
inch wide, with a
1
¼
inch bore hole (S755CL, B6062A QUILLS), or a
⅝
inch bore hole
(B955A. B6055A QUILLS).
(b) Diamond wheel for finish grinding. Grinding requirements will
determine the type of grinding wheel needed (Flaring Cup, Straight
or Saucer Shape). We recommend a resinoid bond diamond wheel,
150 to 180 grit. 100 concentration.
3. A double end diamond hand hone with 400 grit on one end, 500 grit on
the other, vitrified bond, 100 concentration,
1
/
32
inch diamond depth.
4. A diamond wheel dressing stick.
5. A 10 to 20 power magnifying glass.
6. Use of the machine mounted light
6. General Instructions:
1. Cylindrical Grinding: Cylindrical (or "circle") grinding is performed after
new teeth have been brazed to the cutter body or when adjustable blades
have been "set out." This operation assures that the outside diameter of
the cutter will be concentric with the milling spindle and that there are
no "high teeth" on the periphery of the cutter.
Cylindrical grinding operations are performed with the cutter mounted in
the motorized workhead in the position as shown in Figure 57, Chapter
13. Use a silicon carbide grinding wheel, such as the K. O. Lee RV6NH100,
for rough grinding the periphery. Feed the cutter against the wheel at
a moderate rate. Feeding the cutter at too slow a feed rate will cause
the grinding wheel to glaze, overheating the cutter, causing the carbide
to crack.
2. After the cylindrical grinding operation is completed, check to see that
there is sufficient clearance behind the carbide teeth to prevent the
diamond wheel from grinding into the steel portion of the cutter. On
inserted tooth cutters, the steel portion of the tooth should be relieved
with an aluminum oxide grinding wheel. On brazed tooth cutters, the
carbide teeth should project .040 inch to .060 inch beyond the outside
diameter of the cutter body. Ample grinding wheel clearance should also
be provided for grinding the face of the carbide tooth. When the carbide
clearance land has been ground to the extent that the diamond wheel is
grinding the cutter body, the teeth should be "set out" or replaced.
3. Mount the diamond wheel on a wheel collet in the manner described in
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