CLAUSING 1300 Series - Lead Screw End Play Adjustment; Tailstock Handwheel Bearing Adjustment; Checking Center Alignment; Adjusting Tailstock Alignment

1. Remove head end (A, figure 19) and retainer end
(B) of broken shear pin from coupling (C).
2. Rotate lead screw by hand and align holes in
coupling with hole in lead screw. Use a 3/32 ”
diameter punch and tap broken shear pin very
lightly. If shear pin does not move easily, with 
draw punch and rotate lead screw 180 c — tap
out shear pin.
3. Align holes in coupling and lead screw - install
new shear pin and retainer.
Machine two shoulders on a 2 inch diameter cen 
ter drilled bar approximately 12 inches long, see
figure 21.
1.
Take a fine finishing cut on both shoulders with 
out changing the tool setting.
Measure diameters of the shoulders. If diameters
are not the same, tailstock needs adjusting. See
adjusting tailstock alignment.
2.
3.
ADJUSTING TAILSTOCK ALIGNMENT
The tailstock can be set over for taper turning or
re-aligned by adjusting set-over screws (C and D,
figure 221, as follows:
.i
FIGURE 20
FIGURE 22
LEAD SCREW END PLAY ADJUSTMENT
If end play should develop in the lead screw, tighten
nut (A, figure 20)on end of lead screw.
1. Release bed clamp lever (A) and nut on lock
stud (B). TIGHTEN ONLY ENOUGH TO ELIM 
INATE END PLAY - OVERTIGHTEN 
ING WILL DAMAGE THE THRUST
BEARINGS.
CAUTION:
2. Determine direction tailstock is to be moved.
CAUTION:
f
NEVER ADJUST SET-OVER SCREW
WITHOUT FIRST BACKING OUT OP 
POSING SCREW.
3. Back out set-over screw on side toward which
tailstock will be moved.
TAILSTOCK HANDWHEEL BEARING ADJUSTMENT
If backlash should develop in tailstock handwheel,
tighten nut (B, figure 20). Tighten only enough to
eliminate backlash - do not overload bearing.
4. Tighten opposite set-over screw until tailstock
has been moved required amount.
5. Retighten first set-over screw.
i
j
CAUTION: MAKE SURE BOTH SET-OVER SCREWS
ARE TIGHTENED TO PREVENT TAIL-
STOCK SHIFTING UNDER TOOL PRES 
SURE.
FIGURE 21
6. Check headstock and tailstock center alignment.
See Checking Center Alignment.
CHECKING CENTER ALIGNMENT
Lathe
center alignment is tested as follows:
1300
13
1