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Cylindrical Grinder Features New Control and New Wheelhead for Grinding Even More Complex Workpiece Geometries in a Single Clamping

United Grinding Technologies, Inc. announces the introduction of a new and advanced addition to its Studer line of high-performance CNC universal ID/OD cylindrical grinders, the new S33.

Modular design for quick setup and changeover, state-of-the-art digital control and drive systems and user-friendly step-by-step programming make the new S33 a remarkably flexible solution to a wide variety of internal and external cylindrical grinding applications. From high throughput OD production lines to small-scale job shops, the new S33 has the ability to reduce changeover times, speed up grinding processes and deliver consistent precision at an affordable cost.

The S33 has been enhanced and designed to take into account the specific needs of the North American market (automotive OEMs and Tier One suppliers), in that the new S33 reflects the expressed desire for a machine to address internal and external applications in a single platform. According to Hans Ueltschi, vice president, "The level of versatility and flexibility increasingly requested by this important market is significantly and uniquely addressed in design and capabilities of this new machine. The S33 clearly demonstrates our full commitment to tailor products around the explicit requirements of our customers."

Center height is 175 mm. Between-centers grinding length is either 650 mm or 1,000 mm. OD wheel size: ø 500 mm x 63 mm x ø 203 mm. Chuck capacity between centers is 80 kg. to 120 kg.

The new Studer S33 grinder is now equipped with latest generation of high frequency internal grinding spindles. The spindles turn this universal cylindrical grinder into an effective internal grinding machine with high torque and over a large speed range. The machine can now grind with speeds up to 120,000 RPM, thus allowing the grinding of bores down to 0.625". A "flat" torque curve on this type of spindle will mean fewer spindles over a larger speed range. This reduces setup time and investment costs.

The basic wheelhead can be indexed at 0 degrees or 30 degrees for straight and angular plunge grinding. A universal turret wheelhead swivels manually or automatically, permitting external, internal and face grinding of workpieces in a single setup. The machine features a high precision Hirth coupling B-axis with a 1 degree indexing capability. The turret head repeats in .08 arc seconds. This allows for extreme accurate ID to OD run-out and concentricity.

S33 Overview

V and flat guideways are coated with abrasion-proof Granitan® S200 and provide high vibration dampening and superior rigidity. The machine base of Studer-developed Granitan® S103 delivers outstanding vibration dampening, rigidity and strength, as well as excellent chemical stability and thermal compensation.

Digital direct-drive, three-phase servomotors with 40-mm diameter pre-stressed, precision ballscrews power the X- and Z-axes. Cross slide X-axis travel is 285 mm at speeds ranging to 10,000 mm/min. Linear resolution is 0.0001 mm. Distance between slideways is 280 mm. Z-axis slide travel is up to 1,150 mm. Speed and linear resolution are respectively 20,000 mm/min and 0.0001 mm. Z-axis distance between slideways is 200 mm. Z-axis table tilts up to 8.5 degrees for high-precision grinding of tapers.

Direct drive spindle turret wheelhead is powered by a 10 HP motor and has high-precision roller bearings for precise, high-resistance, maintenance-free operation. Peripheral speed up to 50 m/sec with infinitely adjustable speed control to 3200 RPM. Workpiece spindle, with high-precision roller bearings, handles grinding between dead centers as well as live grinding with revolving spindle. Precision control permits fine adjustment of cylindricity during grinding operations to +/- 40 µm.

Guaranteed tolerance precision: 0.0004 mm on roundness and 0.0025 mm straightness deviation over a length of 650 mm or 1,000 mm.

Control & Programming

The new S33 features state-of-the-art Fanuc 00i-TD digital control and axis drive components. Machine operation, setup, changeover, dressing and programming of even complex parts are easily accomplished through the innovative, step-by-step Windows-based StuderWin software with graphical operator interface and 15" color touch screen for CNC control with integrated PC, which allows operators simply to connect grinding cycles to one another and add necessary numerical values. The control then generates the machine program automatically. Advanced manual programming in G code is of course also possible. Programming is done directly at the machine or off-line and then downloaded to the machine control. Process parameters can be changed on the fly, while the machine runs, without affecting the workpiece program.

The S33 control package features proven application-specific Studer grinding cycles for diameters, shoulders (left and right), tapers (negative and positive) and contours. The control also features a technology calculator for definition of process parameters, integrated in-process gaging (optional) and integrated programming of the smartLoad system (optional).

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United Grinding

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