NOTE: Should the chuck remain fitted for any length of time, th.e locking procedure should be repeated"trequentiy. This is. important when the machine is engaged on work which involves intermittent or heavy cutting. lf the chuck is fitted with the spindle nose still viarm from operating, it is essential that the drawnut is re-tightened before starting the machine again from a cold condition, Releasing the drawnut will free the chuck or face- plate from the taper. Care must be taken whenever this is done, however, to ensure that the chuck does not s.lide off the spindle nose to damage the bed or saddle. lt is advisable to obtain assistance each time the chuck is to be removed.
To avoid the possibility of moving the machine from its levelled position, final locking of the chuck or faceplate should be made with the spanner wrench horizontal. r--.!^21^ -------t ,L+=]1---aur 6--E ALIGNMENT CHECKS When the machine is installed initially. or after sub- sequent re-positioning, it is advisable to carefullv check the alignment of the headstock and tailstocti, All machines are accurately aligned before despatch from the Works, but transit shocks may render a further checking necessary or of benefit, - 2. Accurate adjustmentfor re-alignment can be made using the 'set-over' pad which is built into the underside of the headstock and rests between the bedway. 3.
After alignment, tighten the locknut on each ad- justing screw of the set-over pad and securelv tighten headstock retaining screws. HEADSTOCK ALIGNMENT Grip a length of mild steel bar in the chuck and using keen tools take a light cut over the outside diameter for about 6 in of its length. Do not use the tailstock centre as a steady during this test. Micrometer readings at the two ends of the turned diameter(atA and B in the sketch) should be precisely the same. lf the readings differ, the headstock should be re-aligned as follows:- 1. Slacken the six socket-head headstock retaining screws until only finger tight. This will allow the headstock to pivot about the locating dowel.
TAILSTOCK ALIGNMENT Place a prepared 12 in ground steel bar between centres, as shown in the sketch. Then to the top slide fix a dial indicator with its anvil running along the horizontal centre-line of the test bar. By traversing the saddle along the bed, an accurate check on alignment can be made. Any alignment errors may be rectified by adjustment to the two set-over screws provided one at each side of the tailstock base. - -il I l t: t-