A bore slotting machine for cutting radially spaced longitudinal slots in sleeves for automotive power steering units comprising a cutting face adapted to operate within a bore of a component being worked; a motorised drive adapted to impart reciprocating motion to the cutting face; a positional feedback associated with the cutting face (10) and adapted to communicate with a computer; a chuck (12) adapted to hold a component being worked at a location adjacent the cutting face (10) and being supported for indexible rotational movement about a Y axis, substantially parallel to that of the bore in the component being worked; a first shuttle carriage (4) carrying the workholding device such shuttle being adapted for linear motion perpendicular to the bore axis of the component under the influence of a first servo drive (7); a second shuttle carriage (14) adapted to carry the cutting face (10) and associated motorised drive such that movement of the second carriage (14) achieves liner reversible relative motion between the component being worked and the cutting face (10) along an axis parallel to the bore axis; a second servo drive (15) for actuating the second shuttle carriage (14); a controlling computer for activating the cutting face drive and synchronising the first (7) and the second (15) servo drives with the position of the cutting face (10); each drive having a closed loop control system incorporating a feedback device.