The five machines – comprising a four-axis horizontal model and the remainder three-/five-axis vertical designs – are scheduled for installation and commissioning during the second half of 2021.

These SIP machines will be used to produce a range of different workpieces including gearboxes, structural components and satellite guidance systems.

Starrag said they have been chosen by customers because of their ability to consistently produce ultra high-precision, first-time results over many years, with no material wastage – even after resetting to suit different and redesigned workpieces.

The build qualities and performance specifications of the machines explained will ensure these demands are met. Based on a closed rigid frame supported on three points, the machines’ extreme levels of high accuracy – for example, in some cases positioning repeatability is quoted as close to one micron - is also endeared by SIP’s renowned hand scraping of features such as machine bases, linear guideways and spindle heads.

The quartet of vertical machines under construction will be able to accommodate workpieces weighing ranging from 2,500 to 4,000 kgs, and have clamping surfaces from 1,200 mm by 900 mm to 1,700 mm by 1,200 mm. The horizontal machine will handle components weighing up to 4,000 kgs on a clamping surface of 1,200 mm by 1,200 mm.

In all cases, the standard spindle rating is 6,000 revs/min, but optional 8,000 revs/min spindles are available. All of the vertical models have automatic tool changers, and two have high-pressure through-coolant.

SIP sales manager, Adriano Della Vecchia, said: “Underpinned by the SIP mantra of ‘Precision without compromise’, several thousand SIP machines are in operation worldwide, among them a SIP 600 model from 1963! SIP enjoys a worldwide reputation in ultra-high precision jig boring, not only in the niche markets of aerospace and aircraft industries, but also in the transportation and energy sectors in territories that include China, India, USA and Europe.”