Clamping device and collet chuck, base and chuck key therefor

A collet chuck adapted to surround a shank of a supported tool and to be axially displaceable in a mounting hole of a base of a rotating tool, comprising:

• an outer sleeve having a section which tapers conically, the outer sleeve adapted to be supported on a matching tapering conical section of an inner sleeve of a mounting hole of a base;
• a contiguous cylindrical section adapted to form a fit with a cylindrical section of a mounting hole of a base;
• a plurality of axially elongated slots extending radially into an axial section of the collet chuck and each having a width, wherein the number of the slots and the width of the slots are provided such that a clamping range of the collet chuck is less than 0.5 mm;
• wherein the slots of the collet chuck include a first type of slot that extends from a front end of the collet chuck to a depth that is less than a minimum insertion depth of the tool, and a second type of slot that is spaced apart from the front end of the collet chuck and extends in the direction of the cylindrical section, the first type of slot having a first length and the second type of slot having a second length that is greater than the first length;
• and
• wherein liquids are prevented from exiting the mounting hole and passing the tool and into a tool working area.

A clamping device for a rotating tool comprising:

• a base including a mounting hole which is centric with an axis of rotation of the tool and which is adapted to axially receive a tool shank from a front end of the base;
• a collet chuck which surrounds the tool shank and is arranged so as to be axially displaceable in the mounting hole, the collet including an outer sleeve having a section which substantially tapers conically from the front end of the base, the outer sleeve supported on a matching tapering conical section of an inner sleeve of the mounting hole;
• a chuck-clamping device including a locknut which has an internal thread that engages with an external thread of the base, the chuck-clamping device forcing the collet chuck into the mounting hole axially, relative to the mounting hole, wherein the inclination angle of the generatrix of the tapering conical section of the mounting hole relative to the axis of rotation of the tool is greater than 2°, wherein the collet chuck has a contiguous cylindrical section forming a fit with a cylindrical section of the mounting hole of the base, the collet chuck further including a plurality of axially elongated slots extending radially into an axial section of the collet chuck and each having a width, wherein the number of the slots and the width of the slots are provided such that a clamping range of the collet chuck is less than 0.5 mm;
• wherein the slots of the collet chuck include a first type of slot that extends from a front end of the collet chuck to a depth that is less than a minimum insertion depth of the tool, and a second type of slot that is spaced apart from the front end of the collet chuck and extends in the direction of the cylindrical section;
• and
• wherein the collet chuck includes at least a select one of a slot arrangement including a first arrangement, wherein a slot of the second type is arranged between each of two slots of the first type in a circumferential direction if the slots of the first type are axially equally as long as or shorter than that of the second type, and a second slot arrangement, wherein a slot of the first type is arranged between each of two slots of the second type in a circumferential direction if the slot of the first type is longer than that of the second type, such that, viewed over the full circumference of the collet chuck, there are twice as many of shorter slots present relative to longer slots.