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Milling 'Porcupine' cutters for heavy-duty machining of rough edges, deep shoulders and cavities

| Editor: Eric Culp

An extended flute tool is said to work both with high depth of cut and considerable overhang.

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The inserts, mounted on the extended flute cutters, have 4 cutting edges.
The inserts, mounted on the extended flute cutters, have 4 cutting edges.
(Source: Iscar)

According to Iscar, indexable extended flute milling cutters, also known as “long-edge” or “porcupine” cutters, are irreplaceable tools useful for machining rough edges, deep shoulders and cavities and enabling a substantially increased metal removal rate. Correct application of these cutting porcupines to various operations in the shop can be a good source for improvement of productivity and profitability, the supplier said.

The company offers a range of such cutters. Its cutters with tangentially clamped inserts from the Helitang T490 milling line feature an extremely strong and rigid cutter body said to be very important for heavy-duty machining of wide edges and deep shoulders and cavities. The company explained that for these applications, an extended flute tool works both with high depth of cut (several times more than the cutting length of a separate insert) and considerable overhang. Therefore, strength and rigidity of the tool are of top priority for efficient cutting, it noted

The inserts, mounted on the extended flute cutters, have 4 cutting edges that make the insert cost-beneficial, the company said. There are three insert sizes, which differ by the length of cutting edge: 8, 13 and 16 mm, and are divided into three subfamilies. The inserts are produced with several cutting geometries for machining all main types of engineering materials and with various corner radii. Additionally, the inserts are available with chip splitting action for separating a wide chip into small segments. The latter is said to improve chip evacuation, reduce power consumption and strengthen vibration dampening. Moreover, using the inserts with chip splitting cutting edges enables a substantial increase of width of cut, the company explained. The aforementioned inserts are manufactured from the latest Iscar carbide grades with Sumo Tec post-coating treatment. The extended flute cutters are available in two configurations – shank-type endmills and arbor-type shell mills. Endmills include various designs with cylindrical shanks such as straight, Weldon and Clickfit; or tapered shanks such as DIN, BT-MAS, and CAMFIX.

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