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Description
TPUN 330620 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 33 mm |
| Insert thickness s | 6.35 mm |
| Inscribed circle diameter IC | 19.05 mm |
| Corner radius rε | 2 mm |
| ANSI code | TPUN 645 |
U10 cemented carbide indexable insert – applications and design
single-sided 60° triangle without a hole or chip breaker
The TPUN 330620 turning insert is a triangular indexable insert made of grade U10 cemented carbide, manufactured by the Polish company Baildonit in Katowice. Shape T denotes an equilateral triangle with a 60° corner angle, providing easier access to the workpiece profile during longitudinal turning and facing. The positive geometry with a 11° clearance angle, designated by the letter P, makes the insert single-sided and provides three cutting edges. The design without a hole or chip breaker, type N according to ISO 1832, uses a top clamp, simplifying the tool design. The large inscribed circle IC 19.05 mm and thickness of 6.35 mm provide rigid insert support even at greater depths of cut.
Key features of the U10 cemented carbide insert
- Three cutting edges — the triangle has 3 corners, and the single-sided, positive design provides one cutting edge per corner.
- Cemented carbide grade U10 — for finishing and semi-finishing cast irons, alloy and austenitic steels, and short-chipping nonferrous metals.
- Large corner radius rε 2 mm — strengthens the insert tip and allows machining at higher feed rates without the risk of chipping.
- The positive geometry with a 11° clearance angle reduces cutting forces and power requirements compared with negative inserts.
- Design without a hole, secured by a top clamp — easy replacement and reliable support in the turning tool insert pocket.
- Dimensions according to ISO 1832: side length 33 mm, IC 19.05 mm (3/4″), thickness 6.35 mm — for holders with a triangular pocket of this size.
Applications and parameter selection for the triangular insert
Grade U10 is a cemented carbide intended for finishing and semi-finishing cast irons, alloy and austenitic steels, as well as nonferrous alloys and short-chipping plastics. Tolerance class U is broad, so the insert is selected for finishing and semi-finishing rather than finishing to tight dimensional tolerances. It is manufactured by the respected Polish company Baildonit in Katowice, which supplies cutting tools to many industries. Indexable inserts of this type are used on both conventional lathes and CNC machine tools. The code written without spaces is tpun330620.
Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 50 mm at an assumed cutting speed Vc = 100 m/min, the result is approximately 637 rpm. The large nose radius rε 2 mm increases tip strength and allows machining at higher feed rates, but also increases radial forces — reduce the depth of cut on slender workpieces to limit vibration. For materials producing long, ductile chips, use coolant to assist chip flow, as the insert has no chip-breaking geometry. The insert fits turning tool holders with a triangular pocket matching the inscribed circle IC 19.05 mm and top clamping.
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Application limitation
The TPUN 330620 insert has no chip breaker, and the tolerance class U is broad — this is not an insert for finishing to tight dimensional tolerances. When turning materials that produce long, ductile chips (such as low-carbon steel), control chip flow with coolant or select an insert with chip-breaking geometry.
Triangular insert designation decoder according to ISO 1832
how to read the TPUN 330620 code — designation positions 1–7
Designation TPUN 330620 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 330620 insert
design, material selection, and turning parameters
Three — the triangle has 3 corners, and the positive, single-sided geometry (letter P, 11° clearance angle) provides one cutting edge per corner. Once an edge becomes dull, rotate the insert in the tool pocket without changing the holder.
Grade U10 is intended for finishing and semi-finishing cast irons, alloy and austenitic steels, as well as nonferrous alloys and nonmetallic materials that produce short chips. The insert is used on conventional lathes and CNC machine tools.
Mainly in the nose radius within the TPUN 3306 family: a smaller radius is used for finishing at low feed rates, while 2 mm strengthens the tip and allows higher feed rates during roughing and semi-finishing. The remaining dimensions (IC 19.05 mm, thickness 6.35 mm) are identical.
No — type N according to ISO 1832 denotes an insert without a hole or chip breaker, secured by a top clamp. It performs best in short-chipping materials; for long, ductile chips, control chip flow with coolant.
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