A1030U is the latest turning-insert development from Princes Risborough-based Sumitomo Electric Hardmetal Ltd (www.sumitomotool.com).

The insert is targeted at high-precision small-workpiece machining where improved levels of surface finish are required.

Enabling A1030U inserts to achieve enhanced component finishes are a special high-precision grind to the cutting edge and the use of Sumitomo’s Absotech Bronze multi-layer PVD coating; this not only helps to resist micro-chipping but also contributes to extended levels of consistent production, says the company.

The inserts also feature Sumitomo’s latest precision-ground FYS — a narrow-width G-class chip-breaker.

Suitable for both the turning and grooving of smaller inner diameters, A1030U inserts can be applied to workpieces produced from mild steels, alloy steels, stainless steels and heat-resistant steels, as well as pure iron and non-ferrous materials for which chip control is difficult to manage.

Absotech Bronze technology comprises alternate layers (five in total) of TiAlSiN and AlTiSiN coatings, which are applied to a carbide substrate that is said to give double the fracture resistance of more-conventional offerings.

According to Sumitomo, the coating has excellent resistance to heat and oxidation, along with high adhesion strength, making it resistant to peeling off.

A1030U inserts are available in triangular negative and GNDS grooving types with cutting widths of 1.5, 2 and 3mm. Positive inserts include 80, 55 and 35deg diamond shapes, as well as square, triangular and trigon types. All have a selection of nose radii available.