Highly positive with four cutting edges 30 August 2021

Walter AG has launched the new MN3 geometry indexable insert in two grades – a cost-effective, uncoated and polished grade, WN10, and in the grade WNN10, with a wear resistant HIPIMS PVD coating, extremely smooth surface and optimised layer bonding.

The polished rake face, for improved chip evacuation, and the extremely sharp cutting-edge, for a softer cutting action, of the new geometry are particularly important factors for the insert’s good performance. The double-sided insert is a useful expansion of the existing Walter portfolio for ISO N machining with the positive geometries FN2 and MN2.

MN3 is the first Walter geometry to have double the number of cutting edges while also being highly positive. The rake angle on the radius is 29 degrees. It can be used both for the medium machining of non-ferrous metals and ISO N alloys – such as aluminium, copper or brass alloys – and for the fine finishing of small components made from steel and stainless steel materials or high temperature alloys.

Thanks to the highly positive cutting edge and chip nubs, users benefit from improved chip breaking – even when working with ‘lead-free materials’ such as CuZn21Si3P. The surface roughness has also been optimised, which allows for an increased tool life even when working with materials that have a tendency to stick (built-up edges). Finally, the negative basic shape with double the number of cutting edges increases productivity and cost-efficiency. 

Deputy Editor

Claire Aldridge Deputy Editor t: +44 (0) 1727 743 889

Biog

Having spent a decade in the fastener industry experiencing every facet – from steel mills, fastener manufacturers, wholesalers, distributors, as well as machinery builders and plating + coating companies, Claire has developed an in-depth knowledge of all things fasteners.

Alongside visiting numerous companies, exhibitions and conferences around the world, Claire has also interviewed high profile figures – focusing on key topics impacting the sector and making sure readers stay up to date with the latest developments within the industry.