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November 2011

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Fermat Offers Solution for Windmill Industry

"There are several issues that make machining of a windmill hub a big challenge for machine shops," said a Fermat spokesperson. "As a result, the machining of the hub can get quite complicated and become a time consuming process. To simplify this task, Fermat has developed a feature dedicated especially for the manufacturers of windmill turbines, a tilting headstock, which is new to the horizontal boring mill market.

"Apart from simplified machining, the tilting headstock also means an investment reduction. For example, with the tilting headstock option the devices such as angular head and a special tilting table are no longer needed, as it is possible to machine at different angles.

"The tilting headstock is useful in the machining of hubs, bearing housings and bottom frame applications.

"The headstock slide is rigid. The tilting mechanism is seated at a cross-bearing with a loading capacity up to 400 tons. There is hydraulic-mechanical stiffening of the tilting axis for position locking and a ball screw and a servo-motor to drive the tilting mechanism. For the direct measurement of the angle, Fermat uses a Heidenhain rotary encoder ROD280. As there is a possibility of vibration transferred between the slides, Fermat has decided to use GS Super for its damping between sliding surfaces."

The spindle axis can be tilted from 0 up to -8 degrees. The travels range from 0-1,000 mm on the Z-axis (ram out-travel) and from 0-1,000 mm on the W-axis (spindle out-travel). The spindle RPM is 10, 3,000/min, main motor input varies from 37 to 60 kW. Spindle loading capacity is up to 40 kN, the positioning accuracy is 0.001-degrees.

There are different possibilities of machine configuration. First is a standard combination of a floor type horizontal boring mill WRF with one rotary table and tilting ram device. The positioning of the tilting ram and positioning of the rotary table at the same time enables machining under different angles.

The other possible configuration is a combination of a floor type horizontal boring mill WRF with two rotary tables and tilting ram device. This optimizes the investment costs and the productivity of machining as it provides the ability to change a work piece on one table, while machining on the other, said the company.

These are just few of the tilting headstock characteristics that enable the machining of windmill hubs making it less difficult while cutting down both time consumption and machining expenses, said the company.

For more information contact:

Paul Mandelbaum

Lucas Precision

13020 St. Clair Ave.

Cleveland, OH 44108


Zdenka Urbanova, Export Manager

Fermat Machinery

Prumyslova 11

102 19 Prague 10

Czech Republic

Cell: 011-420-773-690-135

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