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Description
RNMG 120400 turning insert – round copy turning insert
| Technical data | |
|---|---|
| Inscribed circle diameter IC (l) | 12.70 mm |
| Insert thickness s | 4.76 mm |
| Shape | R — round (full radius) |
| Clearance angle | N — 0° (negative) |
| Design | double-sided, with a central hole |
| Grade | TCS2 — PVD-coated carbide |
| ISO groups | P15–P40 / M10–M25 |
RNMG indexable insert in grade TCS2 – selecting turning parameters
ISO P and M groups — confirm parameters for grade TCS2 and the tool holder used
| Parameter | Selection guideline |
|---|---|
| Cutting speed vc | Select for steel or stainless steel according to the data for grade TCS2. |
| Feed f [mm/rev] | Match to the required surface finish, setup stability, and insert radius. |
| Depth ap [mm] | Set according to the workpiece profile, machine power, and clamping rigidity. |
Design and applications of the round copy turning insert
negative, double-sided, with a hole — R geometry for 3D contours
The RNMG 120400 turning insert is a round, double-sided indexable insert made of TCS2 grade cemented carbide with a PVD (physical vapor deposition) coating. The R shape, a full circle with an inscribed circle diameter of 12.70 mm, forms one continuous cutting edge without a corner that could chip. Negative geometry with a zero clearance angle provides a strong, substantial edge for copy turning and rough turning. It is manufactured by the Polish company Baildonit, valued by professionals for the consistent quality of its cutting tools. The round shape provides the longest edge among inserts with the same inscribed circle diameter, promoting high material removal rates in rough turning.
Key advantages of the TCS2 round indexable insert
- Continuous round edge — the absence of a corner eliminates the insert's weakest point, making the R shape mechanically very strong in rough turning.
- Double-sided negative design — the cutting edge runs around the circumference on both sides of the insert, doubling the number of available cutting edges.
- TCS2 grade with PVD coating — carbide for steel (P15–P40) and stainless steel (M10–M25), resistant to abrasion and mechanical damage.
- The effective entering angle increases with the depth of cut, so cutting forces remain low at a shallow depth ap.
- The central hole ensures secure, rigid clamping of the insert in the turning tool holder pocket.
- The inscribed circle diameter of 12.70 mm and thickness of 4.76 mm fit tool holders for round R-shaped inserts.
Applications and turning parameter selection
The RNMG 120400 insert performs well in copy and profile turning of shafts, molds, and surfaces with varying contours, as well as roughing hard and difficult-to-machine steels. Estimate the surface finish after the tool pass using the scallop height formula h ≈ f²/(8·R), where f is the feed per revolution and R is the insert radius of 6.35 mm. For a feed f = 0.3 mm/rev, the result is h ≈ 0.3²/(8 · 6.35) ≈ 0.0018 mm, or approximately 1.8 µm — the theoretical Rz roughness is close to this value. Reducing the feed produces a smoother surface at the cost of longer machining time.
Grade TCS2 covers ISO P and M groups, making the insert suitable for structural steels and stainless steels on conventional and CNC machine tools. For stainless steel, maintain a constant feed and continuous coolant flow to limit work hardening of the layer being cut. Select the depth of cut according to the insert radius: the greater ap is relative to the radius, the greater the effective entering angle and the forces. The large radius of the round edge distributes the load over a long section, allowing the R insert to withstand high feed rates in rough turning. In copy turning, feed selection remains a compromise between surface finish and cycle time.
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Application limitation
Grade TCS2 covers only groups ISO P15–P40 and M10–M25 — it is not intended for cast iron and nonferrous metals (groups K and N) or for hardened steels. For cast iron and nonferrous alloys, select an uncoated group K insert, e.g., Baildonit H10 (K10–K20).
Round insert designation decoder according to ISO 1832
how to read the RNMG 120400 code — positions 1–6 of the designation
Designation RNMG 120400 according to the standard ISO 1832: 4 letters describe geometry and construction, 2 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
ISO 1832 designation decoder — how to read the code
1Rshape 2Nangle α 3Mtolerance 4Gtype – 512diameter 604thickness
Positions 1–3 · ISO code
1RShape
Round
peripheral edge without corners
2NClearance angle
α = 0°
negative, double-sided
3MTolerance
Class M (intermediate)
IC ±0.08 · thickness ±0.13 mm
Positions 4–6
4GType
Hole + chip breaker
chip breaker on both sides
512Diameter
d = 12 mm
round insert — full radius
604Thickness
s = 4.76 mm
between rake faces
✓ Peripheral edge — full circle, no corners
Full designation: RNMG 120400 = round · negative · class M · hole and chip breaker · Ø 12 mm · s 4.76 mm
Applications of the RNMG 120400 insert – materials and machining
what to machine with grade TCS2 and what to avoid
Materials and applications
| Rating | Material or application |
|---|---|
| ✔ | Structural and tool steel — group ISO P15–P40 |
| ✔ | Austenitic stainless steel — group ISO M10–M25 |
| ✔ | Copy and profile turning of shafts, molds, and 3D surfaces |
| ✔ | Rough turning of hard and difficult-to-machine steels |
| ✔ | Conventional and CNC machine tools |
| ✗ | Gray cast iron and nonferrous metals — groups ISO K and N |
| ✗ | Hardened steel — outside the stated application range of grade TCS2 |
Frequently asked questions about the RNMG 120400 insert
grade, materials, and turning parameters
Grade TCS2 is PVD-coated cemented carbide intended for groups ISO P15–P40 (steel) and M10–M25 (stainless steel). Do not use it for cast iron, nonferrous metals, or hardened steels — these materials are outside the grade's stated application range.
The R shape provides one continuous edge around the entire circumference, and the design is double-sided and negative, allowing both sides of the insert to be used. After one section of the circumference wears out, rotate the insert in its pocket; after the entire side wears out, turn it over to the other side.
Inscribed circle diameter IC = 12.70 mm, thickness s = 4.76 mm. In the code, the number 12 corresponds to a diameter of 12.70 mm, code 04 to a thickness of 4.76 mm, and 00 indicates no additional corner radius, as the entire circumference of the insert has a single radius.
Primarily for copy turning and profile turning of shafts and variable-contour surfaces, as well as roughing hard steels. The round cutting edge scales forces with the depth of cut: at a small ap the effective entering angle is small, so forces and chip thickness remain low.
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| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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