Patent ID: 6530727
Filing Date: 2003-03-11
Classification: B23C,F01B,F02F,Y10T

Abstract:
A machining head for machining an opening in a work piece comprising:a housing; a spindle attached to an upper portion of the housing; an arbor disposed concentrically within the spindle and having an axis of rotation, wherein a distal end of the arbor extends through the upper portion of the housing; a first motor linked to the arbor for rotating the arbor and spindle; a second motor linked to a proximal end of the arbor for axial translation of the arbor; a carriage feed assembly disposed within the housing, the carriage feed assembly comprising: a first cantilever having a first arm, a second arm and a first pivot point pivotally mounted on a first cantilever axle within the housing; a first connector pivotally connecting the distal end of the arbor and the first arm of the first cantilever; a carriage guide disposed at a lower portion of the housing, the carriage guide extending radially from a rotational center of the housing; a carriage slidably disposed within the carriage guide; a cutting bit extending from a lower portion of the carriage, the cutting bit comprising a single cutting tip; a second connector pivotally connecting the second arm of the first cantilever and the carriage, wherein axial movement of the arbor provides force for sliding the carriage within the carriage guide; a counterweight assembly disposed within the housing, the counterweight assembly comprising: a second cantilever having a first arm, a second arm and a second pivot point pivotally mounted on a second cantilever axle in the housing; a third connector pivotally connecting the distal end of the arbor and the first arm of the second cantilever; at least one counterweight guide within the housing; a counterweight slidably disposed within the at least one counterweight guide; a fourth connector pivotally connecting the second arm of the second cantilever and the at least one counterweight, wherein axial movement of the arbor provides force for sliding the counterweight within the at least one counterweight guide; wherein the counterweights are adapted to counterbalance the weight of the carriage feed assembly when the carriage and cutting bit move radially.