Page 382 - ISCAR(MILLINGCATALOG 38_2021)

USER GUIDE
SLOTTING & SLITTING CUTTERS

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
feed by 15% 30% 45% 100% fz
D
Chip Formation in Slot Milling
Chip shape is a function of the depth of cut.
Down milling starts with large chip selection and exits with T=D/3
reduced chip selection. Down milling is recommended T=D/4
for improved tool life under stable conditions. T=D/10
Vf

Chip Thickness as a Function of D.O.C. to Diameter Ratio

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