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The Sandvik Coromant TCGT GC1025 indexable turning insert with UM or K chipbreaker has a triangle shape with a 7-degree clearance angle, providing high wear resistance without limiting shock resistance for medium machining to finishing of stainless steel and heat resistant super alloys (HRSA) in average to good machining conditions. This single-sided positive insert has chip grooves on one side, a countersunk hole in the center, and three cutting edges. It has a 7-degree clearance angle for light cutting forces and side clearance, making it better than a negative insert for internal turning. It can also be used when there is limited machine power, a tendency toward vibration, or when either a large or small lead angle is required. A combination of carbide and a coating of TiAlN and TiN applied through physical vapor deposition (PVD) provides increased hardness for wear resistance when turning stainless steel and a balance of hardness and toughness for wear- and shock-resistance when turning HSRAs. PVD coatings give the insert longer life and better wear resistance than uncoated inserts, and maintain a sharper cutting edge than those with chemical vapor deposition (CVD) coatings.
The TCGT GC1025 is available with a choice of two types of chipbreakers: UM or K. The UM chipbreaker style is designed for medium machining. The UM chipbreaker style offers a wider range of cutting depth and feed rate combinations than the K style. The K chipbreaker style is designed for finishing operations requiring lower cutting depths and feed rates. Tolerance of distance from the base to the tip of the triangle is + or - 0.001”. Tolerance of the theoretical diameter of the insert is + or - 0.001”. Insert thickness tolerance is + or - 0.005”. Different insert shapes and sizes may have different inscribed circle (iC) measurements, which are related to the insert’s range of cutting depths, speeds, lead angle, and feed rates. The inscribed circle is the largest circle that can be drawn within the edges of the insert shape. In general, as the insert size and iC become larger, the maximum cutting depth increases. The cutting depth influences the metal removal rate, number of cuts, chip evacuation, and power required when using the insert.
Indexable inserts are small cutting tools designed to remove material in external and internal cutting applications such as turning, milling, drilling, and grooving. They are held by an insert holder, have multiple cutting edges, and can be rotated when one edge wears down. Multiple inserts can be used to accomplish a variety of cuts in one operation. An insert is either positive or negative, which refers to the rake or clearance angle at which the insert removes material. Inserts are coded according to their specific cutting and application capability (e.g. VNMG 16 04 04-QM). Each part of the code represents details of the insert shape, nose angle, clearance, tolerance, size, geometry, grade, and chipbreaker style.
Sandvik Coromant produces tools for turning, milling, and drilling. Headquartered in Sweden and represented in 130 countries, the company manufactures tools used throughout the metalworking field, including the automotive and aerospace, die and mould, and general engineering industries. All Sandvik Coromant inserts meet ISO and ANSI standards.Matching Inserts to Holders
These inserts are part of the Sandvik Coromant CoroTurn 107 Positive Insert family, which means they can be used with CoroTurn 107 screw clamping system. This system is a first choice for internal machining of small and medium diameter holes, but is also used for external machining of small, long and slender components.
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