QCMB-GT – INNOT insert

QCMB-GT

Double-ended insert for high-feed parting and grooving, with GT chipbreaker and INNOT CVD, PVD and cermet grades.

ISO P

ISO M

ISO K

Parting and grooving

High feed

★ IT8225 · IT7225

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Technical data sheet PDFCutting data, sizes and grades

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Fits on
Face grooving toolholdersBlades and blocks for parting and grooving

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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

We help you choose grade and chipbreaker

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Description

Specifications

Code Width CW Corner radius RE INSL Available grades
QCMB1502-GT 1.5 mm (+0.05/0) 0.2 16.0 IT8225 – IT6115 – IT7125 – IT7225 – ITC10
QCMB2002-GT 2.0 mm (+0.05/0) 0.2 16.0 IT8225 – IT6115 – IT7125 – IT7225 – ITC10
QCMB2502-GT 2.5 mm (+0.05/0) 0.2 18.5 IT8225 – IT6115 – IT7125 – IT7225 – ITC10
QCMB3002-GT 3.0 mm (+0.05/0) 0.2 21.0 IT8225 – IT6115 – IT7125 – IT7225 – ITC10
QCMB4002-GT 4.0 mm (+0.05/0) 0.2 21.0 IT8225 – IT6115 – IT7125 – IT7225 – ITC10
QCMB5003-GT 5.0 mm (+0.05/0) 0.3 26.0 IT8225 – IT6115 – IT7125 – IT7225 – ITC10
QCMB6003-GT 6.0 mm (+0.05/0) 0.3 26.0 IT8225 – IT6115 – IT7125 – IT7225 – ITC10

CW = cutting width, RE = corner radius, INSL = insert length (mm).

GT chipbreaker data sheet

Operation Parting and grooving
ISO material P (steels), M (stainless steels), K (cast irons)
Type Two cutting edges
Tolerance M
Features Geometry designed for high-feed parting and grooving: narrow, controlled chips even at high feeds, for shorter cycle times.
Compatible toolholders Toolholders for external and face grooves, boring bars for internal grooves

Available INNOT grades

Grade ISO Coating Composition Application
IT8225 ★ P CVD TiN + MT-TiCN + Al₂O₃ First-choice grade for steel, very versatile. Multilayer coating with excellent wear resistance and toughness.
IT6115 K CVD TiN + MT-TiCN + Al₂O₃ First-choice grade for turning cast iron. Thicker black CVD coating with special post-coating treatment: excellent wear resistance and toughness. Also suitable for roughing high-strength steels.
IT7125 M PVD AlTiN Universal grade for turning stainless steel in continuous and interrupted cuts. Smooth, low-friction coating, high nano-hardness and excellent oxidation resistance.
IT7225 ★ M PVD AlTiSiN + TiSiN First-choice grade for turning stainless steel. Nano-gradient coating on a sub-micron grain substrate: excellent wear resistance and toughness.
ITC10 P Cermet Uncoated New-generation, very stable cermet: ideal for finishing low-carbon steels and wherever high surface quality is needed. Hard, compact surface, excellent chemical stability, wear and chipping resistance.

★ Recommended grade for this insert. CVD = chemical vapour deposition coating, PVD = physical vapour deposition coating.

Recommended cutting data

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF
Parting and grooving – cutting speed

Cutting speed Vc (m/min) as a function of feed fn (mm/rev)

Material HB Rm (N/mm²) IT8225 IT7225 IT6115
fn 0.1 fn 0.3 fn 0.5 fn 0.1 fn 0.3 fn 0.5 fn 0.1 fn 0.3 fn 0.5
NON-ALLOY STEELS
C≤0.25% – Annealed 125 428 280 200 130 260 180 120 – – –
0.25<C≤0.55% – Annealed 190 639 240 160 115 200 140 105 – – –
0.25<C≤0.55% – Quenched and tempered 210 708 130 115 100 120 110 100 – – –
C>0.55% – Annealed 190 639 145 130 115 130 120 110 – – –
C>0.55% – Quenched and tempered 300 1013 115 100 80 110 95 70 – – –
Short-chipping – Annealed 220 745 130 115 100 120 105 90 – – –
LOW-ALLOY STEELS
Annealed 175 591 280 200 130 170 135 120 – – –
Quenched and tempered 300 1013 115 100 80 105 90 70 – – –
Quenched and tempered 380 1282 170 90 70 160 80 60 – – –
STAINLESS STEELS
Ferritic / martensitic – Annealed 200 675 – – – 200 150 105 – – –
Martensitic – Quenched and tempered 330 1114 – – – 150 115 70 – – –
Austenitic – Solution annealed 200 675 – – – 185 155 125 – – –
Precipitation-hardening austenitic (PH) 300 1013 – – – 165 135 95 – – –
Austenitic-ferritic (duplex) 230 778 – – – 145 110 85 – – –
CAST IRONS
Ferritic malleable 200 400 – – – – – – 220 160 80
Pearlitic malleable 260 700 – – – – – – 115 90 65
Grey – low strength 180 200 – – – – – – 260 220 150
Grey – high strength / austenitic 245 350 – – – – – – 240 200 130
Ferritic ductile 155 400 – – – – – – 160 130 80
Pearlitic ductile 265 700 – – – – – – 145 110 80
Compacted graphite iron (CGI) 230 400 – – – – – – 150 120 90

Guide values for machining with coolant. For parting and internal grooving reduce the speed by 30–50%. When parting, as you approach the centre of the part, reduce the feed by 30%.

Tips for use

  • Parting off: when approaching the centre reduce the feed by 30% for longer life and a better finish; keep the tool overhang to a minimum.
  • External grooving and side turning: with depths over 0.5 mm work in radial passes (up to 0.75 × insert width), retract 0.1 mm, then an axial pass.
  • Wide grooves: make side-by-side stepped plunges, then finish the bottom and the flanks.
  • Face grooves: start from the largest diameter and move inwards; for finishing machine the bottom and the outer diameter first, then the inner one.
  • Internal grooves: work from the inside outwards to help the chip out.