TURNING INSERT - POSITIVE_SCMT

General information

Manufacturer: Dormer Pramet. Product structure: Turning, ISO positive, carbide inserts, SC.. shape; measurement standard: metric. SCMT inserts are mounted on positive turning toolholders and boring bars for external and internal turning. The listed variants carry recommendations from fine-finishing to roughing, for continuous cuts and, for some variants, slightly interrupted cuts.

Chipbreakers

• FF2: sharp chipbreaker, first choice for fine-finishing of steels; slightly positive rake angle without T-land; also suitable for cast irons.
• FM: versatile, first choice for finishing of steels; positive rake angle with a positive, narrow T-land; also suitable for stainless steels and conditionally for cast irons and non-ferrous alloys.
• UR: versatile, first choice for finishing of cast irons; positive rake angle without T-land; also suitable for steels and conditionally for stainless steels.
• FM2: robust, first choice for medium machining of steels; positive rake angle with a stable, moderate T-land; also suitable for cast irons and conditionally for stainless steels.
• RF: robust, first choice for medium machining of cast irons; slightly positive rake angle with a stable, moderate T-land; also suitable for steels and conditionally for stainless steels and hard materials.
• RM: robust, first choice for roughing of steels and cast irons; positive rake angle with a stable, wide T-land; also suitable for stainless steels and conditionally for super-alloys and hard materials.
• RK: roughing chipbreaker, listed in grade T5025 with corner radius 0.8 mm.

Grades

• Steel (ISO P), MT-CVD coated functionally graded carbide: T9315 (P05-P25), T9415 (P05-P30), T9325 (P15-P35, with M10-M30 on chipbreaker FM), 6630 (P15-P35), T9335 (P20-P45) and T9425 (designed primarily for P-group materials).
• Steel with stainless steel or cast iron, PVD coated fine grained carbide: T8330 (P25-P40 with K20-K40 or M20-M35, depending on chipbreaker) and T8430 (P20-P40, with M20-M35 on chipbreaker FM).
• Stainless steel (ISO M): T8315, PVD coated (M05-M20); T7325, MT-CVD coated (M10-M25 on chipbreaker FM); T7335, MT-CVD coated (M20-M40).
• Cast iron (ISO K), MT-CVD coated carbide: T5305 (K01-K15), T5315 (K10-K25), T5415 (K10-K25) and T5405.

Usage notes

• Use a toolholder or boring bar designed for SC.. 09T3 positive inserts and clean the insert seat before mounting.
• Keep the depth of cut within the APMN-APMX range of the selected model.
• Apply coolant as required by the workpiece material and operation.
• Index to a fresh cutting corner when wear affects surface finish or dimensions.

How to read the order code

Example: SCMT 09T308E-FM:T9325

• S: insert shape, square
• C: clearance angle 7°
• M: tolerance class M
• T: insert type, single-sided
• 09: insert size, inscribed circle 9.525 mm
• T3: thickness 3.97 mm
• 08: corner radius 0.8 mm (04 = 0.4 mm)
• E: rounded cutting edges
• FM: chipbreaker
• T9325: grade

SCMT is the Dormer Pramet family of ISO positive carbide turning inserts in the square SC.. shape. The inserts are single-sided, with a 7° clearance angle, ISO tolerance class M and a fixing hole, and are made for positive turning toolholders and boring bars. The variants listed for this series are in size 09T3, with an inscribed circle diameter of 9.525 mm, a thickness of 3.97 mm and a corner radius of 0.4 mm or 0.8 mm. By combining a range of chipbreakers with coated carbide grades, the SCMT family covers external and internal turning from fine-finishing to roughing in steel, stainless steel and cast iron.

Key features

• Single-sided positive insert, S - square shape with 7° clearance (code C) and tolerance class M.
• Size 09T3: inscribed circle (IC) and cutting edge length (L) 9.525 mm, thickness (S) 3.97 mm, fixing hole (D1) 4.4 mm.
• Corner radius (RE) 0.4 mm or 0.8 mm.
• Chipbreakers for every stage: FF2 for fine-finishing, FM and UR for finishing, FM2 and RF for medium machining, RM and RK for roughing.
• Rounded cutting edges on the E designs.
• PVD coated fine grained WC-Co carbide grades and MT-CVD coated carbide grades, many of them on a functionally graded substrate.
• Primary use in ISO P (steel), M (stainless steel) and K (cast iron) materials.

Square (S) single-sided positive insert with a 7° clearance angle on the flanks, a fixing hole through the centre and the chipbreaker on the top face. Corner radius and chipbreaker vary by model; the main dimensions of the listed size 09T3 are as follows.

• IC: inscribed circle diameter, 9.525 mm
• L: cutting edge length, 9.525 mm
• S: insert thickness, 3.97 mm
• D1: fixing hole diameter, 4.4 mm
• RE: corner radius, 0.4 mm or 0.8 mm
• APMN: minimum depth of cut, 0.3 mm to 1.5 mm
• APMX: maximum depth of cut, 3 mm to 4 mm

Choosing an SCMT insert

Corner radius: RE 0.4 mm suits finishing, small depths of cut and slender parts, where low cutting forces matter. RE 0.8 mm gives a stronger corner for medium machining and roughing. In the listed variants, UR is offered with RE 0.4 mm only, and RF, RM and RK with RE 0.8 mm only.

Chipbreaker by operation:

• Fine-finishing of steel: FF2 (depth of cut from 0.3 mm with RE 0.4 mm).
• Finishing of steel and stainless steel: FM; finishing of cast iron: UR.
• Medium machining of steel: FM2 (up to 3.5 mm with RE 0.8 mm); medium machining of cast iron: RF (0.8 mm to 4 mm).
• Roughing of steel and cast iron: RM (1.5 mm to 4 mm) or RK.

Grade by material: for steel choose from T9315, T9415, T9325, 6630, T9335 or T9425, or the PVD grades T8330 and T8430; for stainless steel T8315, T7325 or T7335; for cast iron T5305, T5315, T5415 or T5405. Within an ISO range, lower numbers such as P05 point to wear resistance and stable conditions, higher numbers such as P40 to toughness for less stable conditions.