Milling Chuck Eliminates Pullout while Machining HSRAs

Big Kaiser introduces the Mega Perfect Grip from Big Daishowa, a milling chuck for machining heat-resistant super alloys (HRSAs) like titanium or Inconel, designed to eliminate end mill pullout under heavy torque loads. Providing fully concentric clamping, the holder combines the accuracy and cutting performance of heavy-duty milling chucks with the security against pullout of solid side-lock toolholders, the company says. The Mega Perfect Grip is available in Big-Plus BCV50 and HSK-A100 in diameters ranging from 0.750" to 1.250", and HSK-A125 in diameters of 1.000" and 1.250".

The system is based around milling cutters with a standard Weldon flat. No special grinding or threading of the milling cutter is required, keeping the system cost-effective. To assemble, the user inserts the key grip into the Weldon flat of the end mill and aligns the key grip with one of three grooves in the chuck body, inserting the cutting tool until it depresses a spring in the clamping bore. The spring functions to remove the gap between the key grip and the wall of the groove, and to provide a slight axial preload on the tool until final tightening is performed. Rotating the end mill approximately 20 degrees secures it against a stopping pin, preventing slippage under high torque, the company says.

The three grooves in the chuck body also provide channels for high-volume coolant to reach the cutter, which is required in milling HRSAs to dissipate heat and to efficiently remove chips.