DNMG-GQ – INNOT insert

DNMG-GQ

55° negative insert for finishing and semi-finishing of steels, with GQ chipbreaker and INNOT CVD grades.

ISO P
Semi-finishing
CVD
★ IT8115 · 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

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Description

ISO specifications

ISO RADIUS (RE) AVAILABLE GRADES CHIPBREAKER
DNMG1504 0.8 – 1.2 IT8105 – IT8115 – IT8125 – IT8225 GQ
DNMG1506 0.8 – 1.2 IT8105 – IT8115 – IT8125 – IT8225 GQ

GQ chipbreaker data sheet

Operation Semi-finishing
ISO material P (non-alloy, alloy and tool steels)
Tolerance M
Features Chipbreaker for semi-finishing ISO P materials, suitable from finishing to semi-finishing. Excellent chip evacuation and high versatility: one solution for several passes on the same part. 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) – GQ 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: 230 – 400
IT8115: 215 – 360
IT8125: 190 – 355
IT8225: 205 – 375		 0.14 – 0.50 1.00 – 5.00
Structural steels ≤ 180 HB
(S235, C45…)		 Average IT8105: 230 – 400
IT8115: 215 – 360
IT8125: 190 – 355
IT8225: 205 – 375		 0.14 – 0.45 1.00 – 5.00
Structural steels ≤ 180 HB
(S235, C45…)		 Difficult IT8125: 190 – 355
IT8225: 205 – 375		 0.14 – 0.40 1.00 – 5.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Stable IT8105: 230 – 400
IT8115: 215 – 360
IT8125: 190 – 355
IT8225: 205 – 375		 0.14 – 0.50 1.00 – 5.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Average IT8105: 230 – 400
IT8115: 215 – 360
IT8125: 190 – 355
IT8225: 205 – 375		 0.14 – 0.45 1.00 – 5.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Difficult IT8125: 190 – 355
IT8225: 205 – 375		 0.14 – 0.40 1.00 – 5.00
Quenched and tempered steels ≥ 280 HB Stable IT8105: 220 – 400
IT8115: 205 – 380		 0.20 – 0.60 0.90 – 4.00
Quenched and tempered steels ≥ 280 HB Average IT8105: 220 – 380
IT8115: 205 – 360		 0.20 – 0.55 0.90 – 4.00

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

Internal turning (boring) of steels (ISO P) – GQ 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: 195 – 340
IT8115: 185 – 305
IT8125: 160 – 300
IT8225: 175 – 320		 0.11 – 0.40 1.00 – 3.00
Structural steels ≤ 180 HB
(S235, C45…)		 Average IT8105: 195 – 340
IT8115: 185 – 305
IT8125: 160 – 300
IT8225: 175 – 320		 0.11 – 0.36 1.00 – 3.00
Structural steels ≤ 180 HB
(S235, C45…)		 Difficult IT8125: 160 – 300
IT8225: 175 – 320		 0.11 – 0.32 1.00 – 3.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Stable IT8105: 195 – 340
IT8115: 185 – 305
IT8125: 160 – 300
IT8225: 175 – 320		 0.11 – 0.40 1.00 – 3.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Average IT8105: 195 – 340
IT8115: 185 – 305
IT8125: 160 – 300
IT8225: 175 – 320		 0.11 – 0.36 1.00 – 3.00
Carbon and alloy steels 180 – 280 HB
(41Cr4, 42CrMo4…)		 Difficult IT8125: 160 – 300
IT8225: 175 – 320		 0.11 – 0.32 1.00 – 3.00
Quenched and tempered steels ≥ 280 HB Stable IT8105: 185 – 340
IT8115: 175 – 325		 0.16 – 0.48 0.90 – 2.40
Quenched and tempered steels ≥ 280 HB Average IT8105: 185 – 325
IT8115: 175 – 305		 0.16 – 0.44 0.90 – 2.40

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.