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Ceratizit has developed the Maximill 273 range of milling inserts featuring a positive clearance angle on both sides.

The result is an insert that combines the advantages of negative inserts with those of positive inserts, according to the company.

An insert with a negative geometry allows both sides of the insert to be used, doubling the number of available cutting edges.

However, negative inserts demand much higher power and stability from the machine tool.

With a positive geometry insert, the power requirement is much less and the cutting action much softer.

Ceratizit has combined the two styles with its Maximill 273, which delivers double the number of cutting edges (up to 16 per insert on the Oaku-style inserts) and a geometry that allows their use on lower-powered machine tools.

Featuring the company’s Masterfinish cutting-edge technology, the Maximill 273 inserts can achieve higher cutting speeds and deliver good workpiece surface finish.

When combined with the low cutting forces generated, good chip evacuation and lower costs per cutting edge, it is said to ensure an efficient machining process and reduced production costs.

The Maximill 273 is available in geometries and grades for the machining of steel, stainless steel and heat-resistant materials, as well as cast iron, and the system covers machining operations ranging from light roughing to finishing.

Another feature of the Maximill 273 milling system is the close pitch available on the cutter bodies, with the maximum number of inserts being available across the diameter range.

This is intended to benefit those machining cast-iron parts, mainly in the automotive industry where, for example, the joint faces of motor blocks have to be milled.

The geometry of the inserts and the close pitch design allow high feed rates, while avoiding the problem of edge chipping of typically brittle cast-iron components.

A variant of the close-pitched system features a precision setting mechanism, which enables operators to adjust the tool to within a few microns to achieve particularly smooth surfaces.


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