Novel chuck design speeds machine setups

The Rota THW Vario chuck is a new concept that enables a three jaw lathe chuck to be equipped with a collet chuck or an expansion arbour.

The Rota THW Vario chuck from Schunk is a new concept that enables a three jaw lathe chuck to be equipped with a collet chuck or an expansion arbour.

This new chuck body always remains mounted to the machine spindle to save valuable time during the setup changeover to alternative clamping units.

The Rota THW Vario allows customers to profit from the possibility of combining a quick jaw change lathe chuck with an expansion arbour or collet chuck.

It is available with four different expansion arbour sizes and three collet chucks.

This innovative workholding device gives the end user fast changeovers via its quick change jaw technology, modular centre sleeve and bayonet connection for either the expansion arbour or collet chuck, all contributing to significantly reduced setup times.

The Vario chuck has a high clamping force and a high TIR of 0.005mm that delivers exceptional repeat accuracy.

The optimum quick jaw change repeatability means that the remachining of machined jaws is not always necessary.

The Vario D expansion arbour is available with D0, D1, D2 and D3 expansion sleeves that can clamp workpieces from 20 to 80mm.

The four sizes of the expansion arbour make it available for clamping internal diameters from 20-28, 26-38, 36-54 and 50-80mm.

The arbours are capable of safely turning at up to 6000rev/min and have a clamping force of up to 105kN.

The Rota THW Vario has simple and fast changing segment bushings that contribute a high level of damping combined with extremely rigid clamping.

Changing to the Vario collet chuck is also quick and easy.

The collet chuck is available in F65-51, F80 and F100 designations and is available for holding external diameters from 4-65, 5-80 and 16-100mm, respectively.

This easily operated fast change system only consists of three components - the Vario F collet chuck, changing device and clamping head.

The collet chuck guarantees a TIR of 0.01mm and the maximum contact "wrap around" clamping enables the Vario collet system to clamp the smallest diameters whilst enabling sensitive clamping to avoid deformation of larger thin walled components.

The F65-51 variation has a through bore of 51mm to accommodate bar stock through the machine spindle thus enabling external turning, drilling, boring and internal turning operations on bar stock, sawn billet or second operation machining.

The collets are well suited to round, square and hexagonal workpieces.

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