BIG Daishowa slimline toolholders offer precision and finish in restricted areas

A slimline design makes the BIG Daishowa toolholders suitable for machining high precision features in restricted areas on components, while tool nose diameters ranging from 14 to 21 mm lend themselves to simultaneous 5-axis cycles without interference. Run-out accuracy is stated at less than 3 microns when measured at 4D, ie a linear distance of four times shank diameter from the point of clamping. Each tool is pre-balanced with the quoted figure for BBT30 toolholders being under 3 g-mm. Infinitesimal levels of vibration both extend cutter life and ensure that chip load on each cutting flute is uniform. This is particularly significant with the shallow depths of cut usual in finishing cycles where the toolholders are likely to be employed. The 6 to 12 mm in diameter cylindrical-shank cutters can be clamped and unclamped rapidly using a single screw and wrench. Repeatability of eccentricity is stated as being better than 1.5 microns. A maximum rotational speed of 35,000 rpm makes the toolholders especially suited to finish milling, grinding, precision drilling and reaming applications in the aerospace, medical and die/mould industries, says NCMT.