Fine machining bores up to 1000mm

The demands made on fine boring tools are primarily increasing improvements to surface finishes and at the same time raising cutting speeds to produce shorter machining times.

The demands on fine boring tools are primarily increasing improvements to surface finishes and at the same time higher cutting speeds to produce short machining times.

With solutions like replaceable insert holders and balancing in the insert adjustment plane or bridging tools from the modular range, Komet offers tried and tested tool designs for diameters from 24.8 to 1000mm.

Fine machining is a demanding bore machining operation.

With M03 micro-adjustable heads Komet provides a tried and tested tool system which, with its high precision adjustment mechanism, from the drive system for the rotating clamping holder to the vernier on the external diameter, allows fine adjustment steps of up to 0.002mm in the diameter.

Depending on the tool size the M03 micro-adjustable heads are roughly adjusted with reference to the diameter in a range between 8 and 24mm.

The fine adjustment for wear compensation or after measurement is then carried out extremely accurately directly on the machine spindle.

There is no need for clamping during and after this fine adjustment which means that the dimension can be perfectly maintained.

Balancing - one of the most notable features of these flexible cutting tools is the balancing carried out in the insert adjustment plane.

As there is a shift in weight when the insert position is changed, an imbalance occurs which needs to be compensated for, particularly at high spindle speeds.

With the M03 micro-adjustable head this adjustment is carried out automatically by means of an opposite moveable balancing weight.

New diameter ranges - micro-adjustable heads were previously available with one-piece rotating clamping holders and for bore diameters of up to 103mm.

At the EMO exhibition in October 2003 Komet was offering a revised and extended version of this product range.

In future this will be based on 6 tool bodies to cover diameters from 24.8 to 206mm.

Maximum changeover accuracy will be guaranteed with ABS connections (25, 32, 40, 50 and 63).

Diameters from 100 to 206 will be provided using a basic body and three adaptable bridges.

Just like the whole production range, the bridges - which are in a lightweight material with a hard surface coating - allow high machining speeds to be achieved.

Combined with the inserts used, the M03 micro-adjustable heads allow cutting speeds of up to 5000m/min.

Flexibility with replaceable insert holders - a special feature of the new product range are the replaceable insert holders.

These give the user the facility to carry out forward and backward machining with one tool with different approach angles.

Using a specially designed connection, the changeover is fast, uncomplicated and safe, giving the user of these tools greater flexibility with regard to the insert holders which can be used without having to keep and resort to separate tools.

In addition to the typical standard fine boring inserts, other insert geometries can also be used.

This means that fewer 'sister' tools are required and the reaction time to the need to change or when tools become damaged is shorter.

Modular tool range - for diameters over 206mm Komet offers 'bridging tools'.

In a modular design, these consist of standard elements, pre-manufactured components with allowances and a cross piece produced to length to customer specification.

The aluminium profile used for this produces a significant reduction in weight.

A 700mm diameter tool, which in steel usually weighs 60kg, is only around 18kg.

The micro-adjustable cartridges are also used on other Komet tools and ensure maximum accuracy.

With M03 micro-adjustable heads of up to 206mm and bridging tools for a bore diameter up to 1000mm, Komet offers a broad-based programme of tools for demanding internal machining tasks.

KOMET Pr?zisionswerkzeuge Robert Breuning GmbH, Besigheim.

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