The trend toward smaller batch sizes is affecting all machine tool development programmes, including those for multi-spindle automatic lathes. Whereas machines used to produce many millions of parts throughout the year without re-tooling, it is now common for subcontract lathe operators to re-tool their multi-spindle machines every two to three days. Set-up times therefore have a significant impact on unit costs.

Karl-Heinz Schumacher, head of development and design of multi-spindle machines at Index (represented in the UK by Kingsbury), says an optimised set-up concept is therefore essential when looking to the future: “Batch sizes are going to get even smaller. This means we need to devise solutions that accelerate tooling and set-up and – no less important – simplify these processes while maintaining a high-precision result.”

The development teams at Index have included a range of effective solutions on the new MS24-6 multi-spindle automatic lathe, as they did previously in the MS32-6 launched last year. One special feature is the Index quick-clamping system with integrated W-serration on the cross slide. Instead of the previously common dovetail system, each cross slide now features a W-serration to simplify micron-precise alignment of the tool holder. The W-serration eliminates the degree of freedom in X, meaning that operators can simply attach the tool holder, which is already pre-set in the X and Y directions. It is attached using a quick-clamping system developed by Index that fixes the holder in position using a tie rod and a pre-tensioned wedge rod. Just a quick turn with the wrench ensures the firm contact required for use.

“This makes the operator 50% faster than when changing holders the conventional way, and practically eliminates the risk of errors,” says Schumacher.

For further information
https://kingsburyuk.com/