Now available from Tamworth-based Industrial Tooling Corporation Ltd (
www.itc-ltd.co.uk) is the new Big Kaiser HMC12J, a super-slim milling chuck with peripheral coolant supply (maximum pressure 70 bar).
According to ITC, a purpose-designed slit concept means that the HMC12J applies the highest gripping force to the cutting tool of any comparable chuck in its class, and some five- to six-times greater than standard collet chucks.
The HMC12J chuck incorporates fine slots and hundreds of needle bearings to ensure a precise yet powerful clamping performance, says ITC.
Despite being designed for heavy cutting, it maintains a run-out accuracy of 10µm at 4xD, allowing it to also be used for finishing applications.
The HMC12J was compared to a collet chuck in a test using a DMG Mori NVX 5080 milling machine with Big-Plus BBT40 spindle, C50 steel was milled using a 12mm-diameter cutter at a cutting speed of 80m/min, 0.092mm feed per tooth and 3.5mm width of cut.
The depth of cut was increased progressively until vibration was evident. For the HMC12J, the depth of cut before vibration was experienced was 22mm — double the 11mm achieved using the collet chuck.