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Description
TNMX 240408 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 24 mm |
| Insert thickness s | 4.76 mm |
| Corner radius rε | 0.8 mm |
| Inscribed circle diameter IC | 13.86 mm |
S30 carbide indexable insert – applications and design
double-sided 60° triangle for turning steel and cast steel
The TNMX 240408 turning insert is a triangular indexable insert made of cemented carbide in grade S30, designed for turning steel and cast steel. Shape T denotes an equilateral triangle with a corner angle of 60°, providing easier access to the workpiece profile during longitudinal turning and facing. The negative geometry with a clearance angle of 0° allows both sides of the insert to be used — a total of six cutting edges. The nose radius rε of 0.8 mm combines cutting edge stability with an acceptable surface finish at medium and larger uncut chip cross sections. The long side l of 24 mm and thickness of 4.76 mm provide ample insert material for roughing under difficult conditions.
Key advantages of the S30 cemented carbide insert
- Six cutting edges — 3 corners on each of the two sides reduce the cost per cutting edge in roughing operations.
- Grade S30 for steel and cast steel — cemented carbide for semi-finishing and roughing at medium and low speeds with large uncut chip cross sections.
- Corner radius rε 0.8 mm — a compromise between corner strength and surface finish at higher feed rates.
- The long side l of 24 mm and thickness of 4.76 mm provide ample insert material for heavy, interrupted cuts.
- Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.
- The corner angle of 60° facilitates longitudinal turning and facing, as well as access to workpiece corners.
Applications and parameter selection for the triangular insert
The TNMX 240408 insert (also written without a space as tnmx240408) is suitable for semi-finishing and roughing shafts, bushings, and steel castings with large machining allowances. Grade S30 operates at medium and low cutting speeds and, under favorable conditions, also maintains productivity at high spindle speeds. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 80 mm and an example speed Vc = 140 m/min, the result is approximately 557 rpm. Select the speed to suit the specific material and setup rigidity, and reduce the feed rate during interrupted cutting to limit edge chipping.
The large triangular indexable insert withstands the variable loads typical of rough turning raw castings and forgings. Three corners on each side reduce the cost per cutting edge, while the symmetrical triangle provides repeatable cutting edge positioning after indexing in the pocket. Indexable inserts in grade S30 are supplied by Baildonit. Before selecting a holder, note that the source description contained specifications for a different size — the dimensions in the table were calculated from the ISO 1832 designation, so they should be confirmed against the manufacturer's current catalog data sheet before ordering.
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Application limitation
Grade S30 is a carbide for steel and cast steel; it is not intended for steels hardened above 45 HRC or heat-resistant alloys. For turning hardened materials, select a grade or insert CBN with suitable characteristics.
Triangular insert designation decoder according to ISO 1832
how to read the TNMX 240408 code — positions 1–7 of the designation
Designation TNMX 240408 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.
Frequently asked questions about the TNMX 240408 insert
design, grade S30, and turning parameter selection
Six — the triangle has 3 corners per side, and the negative geometry (0° clearance angle) allows both sides of the insert to be used. Once an edge becomes dull, simply rotate the insert in its pocket without changing the holder.
Carbide grade S30 is designed for turning steel and cast steel in semi-finishing and roughing operations at medium and low cutting speeds with large uncut chip cross sections. It performs well under difficult conditions on raw castings and forgings; select the speed to suit the specific material and setup rigidity.
Mainly in the nose radius: 0.4 mm is used for finishing at low feed rates, 0.8 mm is the general-purpose version, and 1.2 mm is selected for roughing at higher feed rates. The other dimensions of the TNMX 2404 family (IC 13.86 mm, thickness 4.76 mm, side length 24 mm) are identical.
Side length l is 24 mm, the inscribed circle diameter IC 13.86 mm, and the thickness is 4.76 mm. Use a holder with a triangular pocket of the appropriate size for mounting. The source description contained data for a different size, so verify the dimensions against the manufacturer's current data sheet before purchasing a holder, screw, and shim.
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