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Description
TPUN 110308 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 11.0 mm |
| Insert thickness s | 3.18 mm |
| Inscribed circle IC | 6.35 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | TPUN 222 |
S30s carbide indexable insert – applications and design
single-sided positive 60° triangle without a hole or chip breaker
The TPUN 110308 turning insert is a single-sided, triangular indexable insert made of S30s grade cemented carbide from the Polish manufacturer Baildonit. The T shape indicates an equilateral triangle with a 60° corner angle, which facilitates access to the workpiece contour during longitudinal turning and facing. Positive geometry with a 11° clearance angle (letter P) reduces cutting forces and performs well on lighter, less rigid machine tools. The insert has no hole or chip breaker (type N), and the three corners on one side provide three cutting edges.
Key features of the S30s cemented carbide insert
- Three cutting edges — the triangle has 3 corners, and the positive, single-sided geometry allows each to be used in turn by rotating the insert in its pocket.
- S30s grade for the ISO P25-P35 group — cemented carbide for semi-finishing and roughing steel and cast steel.
- Positive clearance angle of 11° — lower cutting forces and power requirements, beneficial on less rigid machine tools.
- The 60° triangular shape facilitates longitudinal turning, facing, and access to the workpiece contour.
- Corner radius rε 0.8 mm combines a smooth surface finish with tip strength at medium feed rates.
- Dimensions according to ISO 1832: side length 11 mm, IC 6.35 mm (1/4″), thickness 3.18 mm — for holders with a triangular pocket of size 11.
Applications and parameter selection for the triangular insert
The absence of a mounting hole (letter N) means that the insert is secured with a top clamp — the holder's clamping arm rather than a central screw. This arrangement is used in conventional indexable turning tools for external turning, including holders with a triangular pocket of size 11 (IC 6.35 mm). Positive geometry and a sharp edge promote smooth chip formation in ductile steel, while chip breaking must be controlled by selecting the feed rate and depth of cut, since the insert has no built-in chip breaker. Tolerance class U is wide, so it is advisable to adjust the cutting edge position relative to the workpiece during finishing operations.
The TPUN 110308 insert (also written without a space as tpun110308) performs well when turning shafts, bushings, and flanges made of structural steels and cast steel. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 40 mm and an assumed cutting speed of Vc = 120 m/min, the result is approximately 955 rpm. S30s grade (ISO P25-P35 group) is designed for semi-finishing and roughing at medium and low cutting speeds and large uncut chip cross sections. As a turning tool insert, it provides three cutting edges — when a corner wears out, rotate it in its pocket without changing the holder. TPUN 110308 indexable inserts are supplied by the Polish company Baildonit.
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Application limitation
The TPUN 110308 insert has no chip breaker — control chip flow and breaking by selecting the feed rate, depth of cut, and holder geometry. Grade S30s is intended for steel and cast steel, not for materials hardened above 45 HRC.
Triangular insert designation decoder according to ISO 1832
how to read the TPUN 110308 code — designation positions 1–7
Designation TPUN 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.
Frequently asked questions about the TPUN 110308 insert
design, clamping, and material selection
Three — the triangle has 3 corners, and the TPUN insert is single-sided (positive geometry, letter P, without a hole). When one corner wears out, simply rotate the insert in its pocket without changing the holder.
The letter N in the designation indicates the absence of a mounting hole. The insert is secured with a top clamp — with the holder's clamping arm rather than a central screw. This arrangement is typical of conventional indexable turning tools for external turning.
Grade S30s (ISO group P25-P35) is designed for semi-finishing and roughing steel and cast steel at medium and low cutting speeds and large uncut chip cross sections. It is not a grade for hardened materials.
No — type N indicates an insert without a hole or chip breaker. Chip flow and breaking are controlled by selecting the feed rate, depth of cut, and holder geometry, rather than by the shape of the insert's rake face.
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