Fives twin turret multi surface setup all axesClick image to enlarge

Fives Landis LTT grinding machineClick image to enlarge

Fives has launched its newest grinder series, the Landis Twin Turret (LTT) second generation machines designed for grinding challenging materials and geometries.

This model provides a common platform for multiple machine configurations and processes, including OD, ID and profile grinding, milling, polishing, hard and diamond turning, dicing, and in-situ metrology. Supplied in two sizes, the LTT-100 and LTT-400 are multifunctional machines that handle workpieces as large as 100 mm and 400 mm in diameter, respectively.

Fives' LTT ID configurtion of axes layoutClick image to enlarge

The Universal Twin Turret grinder enables sub-micron position control. Two rotary axes are rigidly mounted on a fixed center distance and provide relative motion between the component and cutting tool, with the linear axis used to control the depth of cut and profile shape of the component being machined. Its unique combination of rotary and linear axes produce relative motion between tool and workpiece over a swept working area.

The machine concept coordinates the two rotary axes and a short linear axis in a Twin Turret design to provide far stiffer results than standard machines, as well as remarkable thermal stability. Gone are the inherent thermal stability and stiffness issues that plague conventional machine platforms using stacked linear axes.

The twin turret design enables a simple non-contacting labyrinth seal, making the machine base almost immune to distortions. A far cry from traditional machine designs that suffer from the ever-changing coolant return path and heat transference from the grinding process, resulting in constant variable machine distortions.

The LTT was designed to use the minimum number of bearing interfaces in the machining loop, to maximize machine loop stiffness. Two highly damped hydrostatic bearings are employed and the machine’s turrets are bolted together via a solid granite base plate to resist machining forces and improve precision and repeatability.

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