ToolMaster TM-U3, Instruction Manual

Page: 11 / 36

Centering the Cutter Lip by Grinding
Cylindrical single-lip milling cutters are supplied by the manufacturer with the lip preformed
by rough milling (see Fig. 1). As a result, the cutter lip will first have to be accurately centered
by grinding. Rough grinding of the lip is performed manually by holding the cutter gainst the
circumference of the grinding wheel (see Mg. 2). This opration is followed by finish grinding in
the machine. The off-center tolerance Is ± .0004” (0.01mm), which should be checked with a
micrometer caliper (see Fig, 3 on the last page). To grind the cutter lip correctly, proceed as
follows:
Setup Operations
1. Set swivel arm and index drum F at zero, tighten clamping lever T3: set vertical setting
scale S2 at zero, tighten clamping lever T2 (see Fig. 4).
2. H ave index pin P engage the short-slot (see Fig 5).
3.
Set cutter with aligning gauge C clamp cutter in position, return aligning gauge C (see
Fig. 6).
4. Withdraw index pin P, rotate spring collet bearing 180° , allow index pin P to engage
the short-slot.
5. Shift index head bracket along tubular guide to bring cutter lip into light contact with
end face of grinding whee. Be sure, prior to tightening clamping lever T7, to align
vertical swivel mount index mark with tubular guide.
Tighten clamping lever T7, releaseclamping lever T4.
Centerinq the Cutter Lip
6. Fine adjustment screw H serves to set the index head accurately relative to the wheel
and to provide;the desired depth of cut. The travel of the cutter past the wheel can be limited
by means of adjustable stop screw G.- Thus it`is possible, during grinding to advance the cut-
ter as far as it will go. To bring the cutter lip within the prescribed off-center tolerance, recipro-
cate the index head bracket while advancing the cutter by rotation fine adjustment screw H.
In order to prevent the cutter from being overheated, it is recomended to ieave only a narrow
cutting zone on the grinding wheel (see page 5 “Dressing the Grinding Wheel’). The length of
the, cutter lip should equal one and one half times the diameter of the cutter.
It is not advisable to increase the length of the cutter lip beyond a cetain limitl In the case of
deep engraving work where stepped cutter are used the shank of the cutter will be increased
instead of the lip,