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Seco Tools' new EBP 5672 collet chuck for high precision machining combines the accuracy of shrinkfit and hydraulic chucks with the flexibility of a collet chuck for reduced runout, increased torque capabilities and greater productivity.

Designed to maximize clamping force by distributing it equally over the full length of the collet, the tool minimizes tool runout in high performance, high speed applications. The combination of a strong, trapezoidal thread nut and high precision grind of the collet nut and body ensure the tool’s even holding pressure and allows the collet to seat firmly and securely within its pocket.

The EPB 5672’s design significantly increases rigidity and lowers tool runout. In tool lengths three times O.D. (3xD), it reduces runout to a max of only three microns, a 40 per cent reduction compared with standard type ER collet chucks. Also, torque capacity is three times higher than that of previous collet chucks, allowing for higher running parameters and improved process security.

The collet chuck features a new type of collet nut that has two cylindrical guiding surfaces on both sides of the thread. This feature helps to center the tool and the collet to the centerline of the tool holder. Another unique feature is the special thread on the nut, which helps create a very strong and uniform gripping force on the collet and the tool shank. Milling tests with show increases in tool life of over 30 per cent compared with conventional collet chucks.

The collet chuck is suitable for milling drilling, tapping and reaming in a range of industries including aerospace, medical micro machining, general machining and many others. It is currently available in both conventional and sealed collet in sizes 16R, 16, 25 and 32, while size 11 will be launched later this year.

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