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In With The New Radius Grinding Machines

A higher level of technology allows radius grinding machines to have more powerful software, grinding of larger workpieces, while having easier maintenance. By Studer

Grinding machine specialist Studer is bringing three new radius internal cylindrical grinding machines to market. These are intended to replace theCT700 and CT900 models.

The main fields of application of the company’s new S121, S131 and S141 radius grinding machines are the manufacture of dies, especially in the packaging industry, where tungsten carbide and ceramic are primarily processed, and the production of hydraulic components such as axial pump pistons, guide plates and housings made of hardened steel, cast iron and copper.

Other fields are the production of complex workpieces with several tapers greater than 20 deg to 90 deg in a single clamping, where the main applications are in the watch and medical technology with extra-hard materials such as industrial ceramic, sapphire and tungsten carbide, as well as the manufacture of human implants for shoulders, knees and hips from ceramic and titanium.

Out With The Old

In the past, this range of parts was covered by the company’s universal internal cylindrical grinding machines CT750 and CT960. With its market entry, the new S121 radius grinding machine will now take over the range of applications of the CT750, while the S131 has been designed for the previous component range of the CT960.

New with the S141 radius grinding machine is that the machining of larger workpieces is also now possible:

  • The swing diameter above table is 250 mm for the S121, 300 mm for the S131 and 400 mm for the S141.
  • External diameters up to 160 mm can now be machined with an external grinding wheel 250 mm in diameter.
  • The maximum length of parts including clamping device is 300 mm for all three radius grinding machines
  • The maximum workpiece weight including clamping device is 100 kg.

There are good reasons why Studer is replacing the successful CT models, which translate into increased customer benefit.

First and foremost, a higher level of technology has been achieved with the new radius grinding machines. This is evident in the machine bed, which now comprises of Granitan and thus offers higher dampening levels, thermal stability and guidance accuracy. It is also reflected in the StuderGuide guideway and drive system with linear motors, which features high wear resistance, a long working life and high dynamics (interpolation possibility).

The main benefit which customers can derive from the new machines is the extended range of parts possible due to the larger size of the machine, and the new dressing concept which, thanks to the new arrangement on the B-axis (simultaneously swivelling workpiece table) is not only simpler, but also offers greater thermal stability and mechanical rigidity.

The fact that the new S121, S131 and S141 are now also manufactured according to the Thun modular principle also means non-variable parts in maintenance and service and consequently a higher availability of service technicians. It also means harmonisation of the components and, with the new design and improved ergonomics, an increase in the machine’s value.

Powerful Software


4-position spindle turret (high-precision) with direct drive.

Special mention should be made of the StuderSIM software in regard to the new radius grinding machines. This software acts as an assistant, with which workpieces derived from a drawing can be completely defined, all necessary geometric data for the grinding cycles can be generated and with which the grinding process can be checked and visualised by means of simulation on a PC or on the machine.

It is complemented by hardware which features the previously mentioned Granitan machine bed and the StuderGuide guideway and drive system with linear motors. It also includes X and Z-axes in a cross-slide arrangement as well as a cross slide, which in the case of the S121 can either take one spindle, two spindles in parallel or two spindles on a hydraulic turret, and in the case of the S131 and S141 comes with a 4-position turret with direct drive.

The machines are also equipped with a workhead on a simultaneously swivelling B-axis, a dressing spindle or a fixed dresser on the B-axis and a measuring probe on the grinding head. Other new features are, finally, the enclosure and the control console in the Studer design.

The S121, S131 and S141 radius grinding machines differ from the universal cylindrical grinding machines of the same name in a number of technical details. The B-axes of the radius grinding machines are set up simultaneously and offer interpolation (from -60 deg to +90 deg), while the universal cylindrical grinding machines have a swivelling table, which can be positioned from -10 deg to +20 deg.


Grinding internal tapers and radii on a die.

In addition, the spindles on the radius grinding machines are arranged at the rear of the turret, while this is the other way round on the cylindrical grinding machines: they are at the front. There are also differences in the dressing concept. The radius grinding machines have the dresser on the B-axis, while the cylindrical grinding machines are equipped with two swivelling dressers.

Last but not least, the S121 to S151 cylindrical grinding machines use the Studer operating system StuderWIN, while the new radius grinding machines use the StuderSIM operating system.

Market Segments

In addition to the S121, S131 and S141 new radius grinding machines, Studer’s platform of internal cylindrical grinding machines includes the simple S110 and S120 machines, the S121 to S151 universal internal grinding machines and the S122 production internal grinding machine.

Five machines have been replaced (S120, S145, S151, CT700, CT900), enabling four new market segments to be opened up. The S121 universal internal grinding machines are small machines for a large application range, the S122 production internal grinding machine is a machine for large component output and high availability, and the S141 and S151 universal internal grinding machines (700 and 1300 mm) are machines for long workpieces.

Finally, a fourth market segment is opened up with the new S141 radius grinding machine for parts up to 400 mm in diameter.

APMEN Machine Tools, Dec 2016

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