KELLENBERGER
K80

Precision from the cylindrical grinding process generally relies far more on thermal stability than vibration damping. The machine bed ensures a lower level in thermal expansion an the heat produced during the production can also be quickly transmitted through the machine bed. All structural elements ensure a homogenous, continuous and stable medium with all major parts having the same low coefficient of thermal expansion. Advanced one-piece working table replaces the traditional separated working table which gives a gigher rigidity to the machine.

The linear guideways guarantee a high level of precision and low friction linear movement. The guideways are equipped with recirculating roller bearings designed to take loads from all directions and support extremely high capacities. Large internal spacings of the load carrying surfaces are implemented with what is called an O-arrangement of the guideway. In conjunction with roller tracks that are offset by 90°, this achieves a uniform and high absorption of forces from all directions and provides high moment igidity.

The high-grade cast iron table slideways are precision hand scraped for smoothness of movement and the highest accuracy. Lubricated special material ensures low friction, significantly reduced stick-slip differentials and minimal wear on the slideways.

Universal wheelhead design ensures multiple external and internal grinding wheels comination to achieve OD, ID, face and profile grinding in one clamping. The weel head with 1 OD & 1 ID, 2 OD & 1 ID, 2 ID & 1 OD or 2 OD are all common configurations. The wheelhead equipped high performance motor spindle as main grinding spindle which gives power up to 9kW and wheel sizes up to Ø500 x 80mm for higher efficient grinding. Various internal grinding spindle can be equipped. Speed range from 30000rpm to 60000rpm. More spindles solutions are available depends on the application. All spindles are cooling with water system to assist maintaining a consistent temperature.

Torque motor directly driven rotary ”B” axis gives wheelhead in higher strength, smoothness of action and maximum accuracy. The contraption encloses all parts in one unit which makes the machine longer life and lower maintenance cost. Full enclosed B axis is very precise, with 0.0001° positioning resolution and ±4” arc repeatability.

The rigid live and dead spindle workhead contains robust, high precision roller bearings assuring maximum spindle stability and superior stiffness. The spindle has a MT5 taper with A2-5 nose which easy to adapt center and chucks for higher stiffness on clamping. Ø38mm through bore to accommodate workholding devices and through bore coolant options. A Fanuc digital AC servo drive to the spindle provids variable speed change, ensures fast, accurate spindle orientation.

The high accuracy plain bearing lver operated tailstock with optional fine taper correction adjustment can be manually adjusted in 0.5µm increments or less with a total adjustment range of 0.06mm. Morse taper in tailstock is MT4.

Both the workhead and tailstock bases have the added benefit of being fitted with air lift pads to ensure easy, quick and accurate re-ositioning. The lifting mechanism is simple to operate, reduces wear and ensures faster set ups.

A multitude of dressing solutions are available, from Diamond disc or roll dressers, to special programmable articulating dressers for complex or internal forms. Nomally equipped two diamond dresser holder behind of workhead and tailstock. Even the smallest of details are considered by offering features such as coolant feed directly to the wheel dressing diamonds to minimize diamond wear, optimizing precision and reducing set ups and consumable cost.