DNMG-GC – INNOT insert

DNMG-GC

55° negative insert for finishing steels with excellent surface quality, with GC chipbreaker and INNOT CVD grades.

ISO P
Finishing
CVD
★ IT8105 · IT8225

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Technical data sheet PDFCutting data, sizes and grades

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Fits on
93° profiling toolholders

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INNOT grades

CVD, PVD and cermet for ISO P, M, K, S

Standard ISO designation

Compatible with the insert holders you use

Technical support

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Description

ISO specifications

ISO RADIUS (RE) AVAILABLE GRADES CHIPBREAKER
DNMG1504 0.4 – 0.8 IT8105 – IT8115 – IT8125 – IT8225 GC
DNMG1506 0.4 – 0.8 IT8105 – IT8115 – IT8125 – IT8225 GC

GC chipbreaker data sheet

Operation Finishing
ISO material P (non-alloy, alloy and tool steels)
Tolerance M
Features Recommended chipbreaker for finishing ISO P materials. Excellent chip control and high surface quality. Sharp yet strong cutting edge. Particularly suitable for machining shoulders and for wall face-ups. 55° rhombic shape: a slimmer tip than the 80°, ideal for profiling, copy turning and contour turning with access to shoulders.

Available INNOT grades

Grade ISO Coating Composition Application
IT8105 ★ P CVD TiN + MT-TiCN + Al₂O₃ Turning of steel in stable conditions. High hot hardness, resistance to wear and plastic deformation.
IT8115 P CVD TiN + MT-TiCN + Al₂O₃ Continuous and lightly interrupted cuts. Finishing and semi-finishing of carbon and alloy steels.
IT8125 P CVD TiN + MT-TiCN + Al₂O₃ Interrupted and continuous cuts on steel. The reinforced substrate limits plastic deformation at high temperature.
IT8225 ★ P CVD TiN + MT-TiCN + Al₂O₃ First-choice grade for steel, very versatile. Multilayer coating with excellent wear resistance and toughness.

★ Recommended grade for this chipbreaker. CVD = chemical vapour deposition coating. ISO P = steels.

Recommended cutting data

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF
External turning of steels (ISO P) – GC chipbreaker

Recommended cutting data by material and cutting condition (stable, average, difficult).

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Structural steels ≤ 180 HB
(S235, C45…)		 Stable IT8105: 250 – 420
IT8115: 230 – 400
IT8125: 215 – 360
IT8225: 225 – 380		 0.08 – 0.36 0.30 – 2.00
Structural steels ≤ 180 HB
(S235, C45…)		 Average IT8105: 250 – 420
IT8115: 230 – 400
IT8125: 215 – 360
IT8225: 225 – 380		 0.08 – 0.36 (IT8105)
0.08 – 0.31 (others)		 0.30 – 2.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Stable IT8105: 250 – 420
IT8115: 230 – 400
IT8125: 215 – 360
IT8225: 225 – 380		 0.08 – 0.36 0.30 – 2.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Average IT8105: 250 – 420
IT8115: 230 – 400
IT8125: 215 – 360
IT8225: 225 – 380		 0.08 – 0.36 (IT8105)
0.08 – 0.31 (others)		 0.30 – 2.00
Quenched and tempered steels ≥ 280 HB Stable IT8105: 230 – 400
IT8115: 210 – 380		 0.10 – 0.40 0.30 – 2.00
Quenched and tempered steels ≥ 280 HB Average IT8105: 230 – 380
IT8115: 210 – 360		 0.10 – 0.35 0.30 – 2.00

Guide values for the GC chipbreaker. Conditions not shown are not recommended for that material.

Internal turning (boring) of steels (ISO P) – GC chipbreaker

Starting values for internal turning with a boring bar, derived from this insert's external turning data: cutting speed −15%, feed −20%, maximum depth of cut −40%. Negative inserts are mounted on boring bars for bores from about Ø 25 mm upwards (Ø 32–40 mm for the larger sizes).

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Structural steels ≤ 180 HB
(S235, C45…)		 Stable IT8105: 215 – 355
IT8115: 195 – 340
IT8125: 185 – 305
IT8225: 190 – 325		 0.06 – 0.29 0.30 – 1.20
Structural steels ≤ 180 HB
(S235, C45…)		 Average IT8105: 215 – 355
IT8115: 195 – 340
IT8125: 185 – 305
IT8225: 190 – 325		 0.06 – 0.29 (IT8105)
0.06 – 0.25 (altri)		 0.30 – 1.20
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Stable IT8105: 215 – 355
IT8115: 195 – 340
IT8125: 185 – 305
IT8225: 190 – 325		 0.06 – 0.29 0.30 – 1.20
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Average IT8105: 215 – 355
IT8115: 195 – 340
IT8125: 185 – 305
IT8225: 190 – 325		 0.06 – 0.29 (IT8105)
0.06 – 0.25 (altri)		 0.30 – 1.20
Quenched and tempered steels ≥ 280 HB Stable IT8105: 195 – 340
IT8115: 180 – 325		 0.08 – 0.32 0.30 – 1.20
Quenched and tempered steels ≥ 280 HB Average IT8105: 195 – 325
IT8115: 180 – 305		 0.08 – 0.28 0.30 – 1.20

With a boring bar overhang above 3 times the diameter (steel bar) or 5 times (carbide or anti-vibration bar), reduce speed and feed further. Use the bar's internal coolant to clear the chips.