Bore slotting machine

In a machine for machining arcuate bottomed blind ended slots longitudinally within the bore of a sleeve member comprising a rotatable work carrier for gripping a sleeve member, a cutting tool mounted on a spindle offset from and at right angles to the axis of a sleeve member gripped in said work carrier, means supporting said spindle for angular reciprocations to permit said cutting tool to execute a succession of alternate cutting and retraction strokes in relation to the sleeve member gripped in said work carrier, a drive shaft, means for angularly reciprocating said spindle upon rotation of said drive shaft, first cam means rotatable synchronously with said drive shaft, first cam follower means and first connecting means associated therewith and arranged to produce a relative movement of said spindle and said work carrier away from and towards each other during each retraction stroke, second cam means, means to drive said second cam means at a reduced speed from said drive shaft, second cam follower means and second connecting means associated therewith and arranged to produce a progressive relative movement of said cutting tool mounted on said spindle and said work carrier towards each other during each successive stroke whereby an arcuate bottomed blind ended slot is progressively machined in a sleeve in said work carrier.