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Description
VBMT 110308 turning insert – acute 35° diamond
| Technical data | |
|---|---|
| Side length l | 11 mm |
| Insert thickness s | 3.18 mm |
| Hole diameter d1 | 2.8 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | VBMT 222 |
Cutting data for the VBMT 110308 insert for steel and stainless steel
finishing, semi-finishing and roughing — ISO P and M groups
| Material | Finishing | Semi-finishing | Roughing | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | |
| PSteel | 200-295 | 0.07 | 0.13 | 170-240 | 0.13 | 0.3 | 150-215 | 0.26 | 1.7 |
| MStainless steel | 110-230 | 0.07 | 0.13 | 70-175 | 0.13 | 0.3 | 50-135 | 0.26 | 1.7 |
Diamond-shaped H6310 cemented carbide insert – applications and design
single-sided 35° diamond with a hole and chip breaker
The VBMT 110308 turning insert is a single-sided, diamond-shaped indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. The V shape, an acute diamond with a 35° corner angle, facilitates copy turning and machining profiles with changing feed directions. Positive geometry with a 5° clearance angle reduces cutting forces, allowing the insert to perform well on slender shafts and smaller lathes. The rε 0.8 mm nose radius combines a satisfactory surface finish with edge durability at feeds up to 0.26 mm/rev.
Key advantages of the H6310 cemented carbide insert
- Positive 5° geometry — lower cutting forces and reduced power consumption facilitate machining slender workpieces and working on smaller lathes.
- Grade H6310 for ISO groups P and M — general-purpose PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
- Acute corner angle of 35° — unobstructed access to the contour during copy turning and machining profiles with changing feed directions.
- The rε 0.8 mm nose radius provides a balance between surface finish and insert tip strength.
- Dimensions conform to ISO 1832: edge length 11 mm, IC 6.35 mm (1/4″), thickness 3.18 mm — compatible with holders with a VB 11 pocket.
- Tolerance class M ensures repeatable edge positioning after indexing the insert in the holder pocket.
Applications and cutting data selection for the diamond-shaped insert
The VBMT 110308 insert (also written without a space as vbmt110308) performs well in finish and semi-finish turning of shafts, bushings, and profiled components made of structural steels and stainless steel. The acute 35° diamond is a typical turning tool insert for copy turning, where the tool must follow a changing workpiece contour without the side of the insert colliding with the material. It also performs well in longitudinal turning of smaller diameters, where dimensional accuracy and low pressure on the slender workpiece are essential.
Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 30 mm at Vc = 250 m/min, the result is approximately 2653 rpm. The acute corner angle facilitates profile machining but weakens the insert tip, so select a smaller depth of cut than for diamond inserts with a 80° corner angle. Grade H6310 cemented carbide indexable inserts are supplied by the Korean brand Horn.
When turning stainless steel, maintain a cutting speed of 50–230 m/min, a constant feed, and a continuous supply of emulsion coolant. Austenitic steel conducts heat poorly and work-hardens when cutting is too slow, so avoid interrupting contact between the edge and the material. The insert's positive geometry reduces built-up edge and improves the quality of the turned surface.
▲
Application limitation
Grade H6310 is not intended for steels hardened above 45 HRC — for a turning insert for hardened steel, select the version VBMT 110308 CBN with a cubic boron nitride edge. The acute 35° tip also requires a reduced depth of cut on interrupted surfaces.
Rhombic insert designation decoder according to ISO 1832
how to read the VBMT 110308 code — positions 1–7 of the designation
Designation VBMT 110308 according to the standard ISO 1832: 4 letters describe geometry and construction, 3 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
Compatible turning tools
holders with a VB 11 diamond pocket — external and internal turning
SVJBR/L 1212 F1112×12 × 80 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJBR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJBR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVJBR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SVVBN 1616 H1116×16 × 100 mmNeutral
↔
↔
SVVBN 2020 K1120×20 × 125 mmNeutral
↔
↔
SVVBN 2525 M1125×25 × 150 mmNeutral
↔
↔
SVHBR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SVHBR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVHBR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
SVZBR/L 1616 H1116×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SVZBR/L 2020 K1120×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SVZBR/L 2525 M1125×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
S16P SVUBR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R SVUBR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S SVUBR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S16P SVQBR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R SVQBR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S SVQBR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S16P SVXBR/L-11Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R SVXBR/L-11Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S SVXBR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the VBMT 110308 insert
use, turning tool selection, and turning parameters
Two — the diamond has 2 corners with a 35° angle, while positive geometry (code B, 5° clearance angle) indicates a single-sided insert with only the upper rake face in use. Once one corner becomes dull, rotate the insert in its pocket to use the other.
Holders with a VB diamond pocket for size 11 (IC 6.35 mm): for external turning SVJBR/L (entering angle 93°), SVHBR/L, SVVBN and SVZBR/L with cross sections of 12×12–25×25 mm; for internal turning, boring bars S16P–S25S with the suffix SVUBR/L, SVQBR/L, or SVXBR/L. The choice of right-hand (R) or left-hand (L) depends on the feed direction.
Mainly in the nose radius: 0.4 mm (110304) is used for finishing at low feeds and lower radial forces, while 0.8 mm (110308) is a more versatile version with a stronger tip. The remaining dimensions — IC 6.35 mm, edge length 11 mm, and thickness 3.18 mm — are identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 50–230 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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