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Gearboxes give constant power in machining centres

A ZF Great Britain product story
Edited by the Engineeringtalk editorial team May 17, 2001

ZF's two speed gearboxes are an essential component in the popular Asquith Butler PowerCentre and StarCentre machining centres with their modular, common build approach

It's business as usual for the Asquith Butler range of machining centres, since the company became AB Marwin Ltd.

Development of the popular Asquith Butler PowerCentre and StarCentre machining centres is continuing, and the modular, common build approach, key to fast deliveries on the machines, is being retained.

ZF's two speed gearboxes are an essential component in this approach.

They simplify the machine design, giving savings in manufacturing costs and built times.

The Asquith Butler range of machines have two speed ranges of 3000 rpm and 6000 rpm.

With the requirement that they should be as flexible and versatile as possible, their design has to ensure that customers benefit from maximum spindle motor power to optimise cutting operations, right across the respective speed ranges.

The key to achieving this objective is the facility of the ZF boxes to provide constant power across the speed ranges of the machining centres, right down to a common base speed of 375rpm.

This means that the same mechanical arrangement can always to be used, irrespective of the maximum speed requirement.

The solution of employing ZF two speed gearboxes also provides a more compact, efficient, quiet and cost effective solution than traditional methods of achieving constant power using more powerful (and more expensive) spindle motors.

With their co-axial output the ZF gearboxes are easy to fit and they provide the high speed performance required by modern machine tools.

Depending upon the constant-power control range of the motor, the two speed gearboxes can be used to transmit constant power to the main spindle at a ratio of up to 1:20.

This gives the user the best of both worlds: high torque at relatively low motor speeds, and high power at high motor speeds, and enables full utilisation of the cutting power of his machine tools.

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