6.4 Turning between centres:
With a ruler locate and mark the centre on each end.
Put a dimple in each end of the shock. Extremely hard woods
may require kerfs cut into the spur drive end of stock (see Fig
16.
Fig 16
The spur drive centre
locks into the spindle taper and can
be removed with the knockout rod (Fig 17)
Fig 17
The live centre
locks into the tail stock taper and can be
removed by rotating the handwheel counter clockwise (Fig
18)
Fig 18
Fig 18-1
Mount the centred workpiece between the spur drive centre
and the tailstock mounted live centre (Fig 19)
Fig 19
Turn the tailstock hand wheel until the live centre well
penetrates the workpiece. Reverse the hand wheel by one
quarter turn and lock the tailstock spindle (M, Fig 18)
Turn the workpiece by hand to see if it rests securely between
centres and can be rotated freely.
The live center, shown in Figure 18-1, can be used without
the cone. To remove cone from live center, first insert pin
through hole in live center body as shown. If pin will not
insert at first, rotate cone until pin can be inserted. The
cone can now be removed by holding the body stationary
while unscrewing cone.
