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The basic feed (Table 49) is 0.05 mm/tooth, the chip thinning factor (Table 50) – 1.1.
Without any information regarding stability of machining we can, however, assume that it is
sufficient (the short shank of type A, small allowance) and the programmed starting feed will be
0.05×1.1=0.055 (mm/tooth).

The starting cutting speed 100 m/min, which is taken from Table 51, can be even increased by
10-15%, as above, and is set 110 m/min.
Effective diameter De=8-2×2+2×√(2×2×1.3-1.3²)=7.7 (mm). The effective diameter is very close to
the nominal diameter of the head (96%); and corrections for a programmed spindle speed are not
needed. The spindle speed 1000×110/(π×8)=4377 (rpm), the feed speed
0.055×6×4377=1444 (mm/min).

3.1.3. BALLPLUS one-insert toroidal milling tools

BALLPLUS (Fig. 19) is a multifunction system comprising straight and tapered cylindrical shank
options and inserts of various types. A one-insert tool is a combination of an insert, which has
cutting teeth and a shank. The shank has the ability to carry every type of insert. The insert rear
(non cutting) V-shaped part is positioned against two contact surfaces within the corresponding
Milling Tools
V-formed slot of the shank; and a clamping screw being tightened pulls the insert towards the
contact surfaces - that guarantees high accuracy and firm and secure insert mounting,
even under considerable cutting forces. Replacing the inserts is very simple.

The BALLPLUS system offers the following insert shapes:
• Spherical and ball nose (hemispherical)
• Toroidal
• Square
• V-shaped (for chamfering and countersinking)

Fig. 19

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