Importance

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Abstract

A high speed toolholder for driving a small high speed cutting tool from the large slow speed spindle of a machining center comprises a housing having a retention pin extending from side end thereof. An input shaft, dimensioned to be received in the machining center spindle, is rotatably journaled into the toolholder housing parallel to the retention pin. Rotatably journaled into the opposite side of the housing so as to be coaxial with the input shaft is an output shaft whose distal end has a tapered bore therein dimensioned to receive the shank of a high speed cutting tool. Within the housing, each of the input and output shaft carry a separate one of a pair of sheaves which are each lined by a V-belt to a separate one of a pair of sheave members on a step sheave rotatably journaled in the housing parallel to the input and output shaft. When the housing is positioned adjacent to the spindle so that the input shaft firmly seats into the spindle and the retention pin seats in a bore the machine tool spindlehead, rotational energy is transmitted from the spindle to the output shaft to rotatably drive the cutting tool therein at a speed several times greater than the spindle speed.

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First Claim