Page 64 - MILLING CATALOG p319-550

SLOTTING & SLITTING CUTTERS USER GUIDE

Feed Direction

Down (climb) milling is recommended.
Up milling or plunging are possible.
(In down milling or plunging, backlash should be eliminated.)

Defining Actual Feed
Chip thickness decreases as the depth of cut
decreases. Therefore, recommended feed (fz)
can be increased as shown in the table.

T/D Increase 1/6 1/8 1/10 1/20 Vc

recommended 15% 30% 45% 100% fz
feed by D

Chip Formation in Slot Milling T=D/3
Chip shape is a function of the depth of cut. T=D/4
Down milling starts with large chip selection and exits with T=D/10
reduced chip selection. Down milling is recommended Vf
for improved tool life under stable conditions.
Chip Thickness as a Function of D.O.C. to Diameter Ratio

Stacked Cutters(1) Insert Width and Possible Modification ∆S max

Milling Wider Slots with Two Stacked Cutters See sketches on next page —
1 In accordance with the required width of cut (W1+W2), W A R ∆A max 0.10
2.40 2.40 0.16 0.33 0.17
choose the recommended SGSF cutter combination 3.00 2.40 0.20 0.24 0.19
(A, B, or C) from the table on the next page. 3.18 2.40 0.22 0.24 0.11
2 The diameters and coupling holes must fit properly. 4.05 3.20 0.24 0.32 0.22
3 All cutters (with the exception of ø125 mm type) 4.78 4.00 0.28 0.40
have two key slots enabling staggered stacking. 5.00 4.00 0.28 0.40 —
4 Maximum value of shim ∆S (see table below) refers 5.20 4.00 1.50 0.40 0.13
to maximum size of ∆S1+∆S2 defined for a complete 6.35 5.20 0.50 —(1)
overlap of radii. When a projection is allowed at the
bottom of the groove, ∆S1 and ∆S2 may be increased ∆A max - Maximum possible side ground for each cutter
theoretically up to the corner size of the insert. ∆S max - Maximum possible shim width for each cutter
5 Pins of the driving flange set should be lengthened W, W1, W2 - Normal width of insert
to ensure contact length of at least 8 mm into
one flange and 3 mm into the other. Milling Wider Slots with
6 When coupling cutters W=6.35, a shim (S) Stacked, Double Cutters
of 0.16 mm minimum thickness must be used.
7 The tolerance of effective widths is up to ± 0.2 mm.
Due to the accumulation of tolerances, a step of 0.1 mm
may occur at the groove bottom.

(1) Only cutters with 160-250 diameter sizes can be stacked.

380 ISCAR