FIG 17.5 'LOADING' OF DISC SPRINGS.
USE RING SPANNER
FOR TIGHTENING
GAP (APPROX.
0.5mm) MEASURE
BY VERNIER
ORIENTATION
MARK
ORIENTATION
MARK
62
12
8
4
3
TEETH
ENGAGED
FIG 17.4 INSPECTIONOF AXIAL CLEARANCE OF DRUM CAM ASSEMBLY
12
11
8
4
25
TEETH
DISENGAGED
17.16 Inspection of axial clearance
of drum cam assembly.
(fig 17.4): Hold sliding coupling (4) by
one hand and rotate cam gear (8) by
the other hand, till the coupling teeth
are dis-engaged as shown in fig 4.
Now place springs (11) and lock-nut
(12) in position. Tighten locknut by
hand, so that it will press the springs
with a light pressure. Check axial
clearance of drum cam by a dial
indicator as shown in figure by lifting
and lowering the cam gear by hand.
Clearance should be within 0.1 to 0.2
mm. If clearance is low, it should be
adjusted by surface grinding the bot-
tom face of cam flange (25). If the
clearance is more, it should be adjust-
ed by replacing the flange (25) by a
new flange of suitable extra thickness.
17.17 Remove disc springs (11) and
screw in locknut (12) till it butts against
shaft shoulder. Measure the gap be-
tween the nut face, and threaded
shoulder ( fig. 17.4). Mark a line on the
nut face and spindle shaft to indicate
the angular alignment.
17.18 Final sub assembly. (fig
17.5): Align orientation marks on
fixed coupling (3) and sliding coupling
(4). Also align orientation marks on
cam gear (8) and sliding coupling (4).
Place disc springs (11) in position and
tighten the lock nut (12) by hand. It is
however not possible to tighten the nut
by hand to its full travel up to shaft
shoulder.
For further tightening, insert indexing
gear assembly (fig. 2) on the spindle.
So that pinion teeth (62) engage with
the teeth on lock nut (12). Tighten up
screws (15) to lock gear on spindle.
Now use a ring spanner to rotate
pinion shaft, and to tighten the nut till
it butts against shaft shoulder.
Remove indexing gear assembly, In-
spect the gap, and check the align-
ment of making to ensure that the nut
has been fully tightened. The sub
assembly is now complete.
15
TEETH
DISENGAGED
BI-DIRECTIONAL TOOL TURRETS 23
