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Craftsman Professional 351.211970 Operator's Manual page 8

Mill drill with stand

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Rotating gib adjustment bolts (Fig. 9, Key No. 25)
clockwise tightens dovetail ways. Adjust gib bolts
until a slight drag is felt when moving the table with
handwheels. Loosen bolts if table is too tight.
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Figure 6 - Gib Adjustment
REPLACE
RETURN
SPRING
Refer to Figure 7 and 8.
Return spring may wear after extended use and will
need replacement. If spindle does not return to full up
position when released, then replace return spring.
CAUTION:
Spring is under tension and may tend to
twist forcefully when relaxed.
.
To replace return spring, push spindle to fully up
position and lock it in place by tightening quill lock
handle (Figure 8, Key No. 23).
° Loosen spring cover knob (Figure 7, Key No. 38)
slowly and carefully rotate spring and cover clock-
wise to relax spring tension.
° Remove spring cover knob and washer (Figure 7,
Key No. 38 and 40). When tension is released, rotate
spring and cover clockwise to release spring from
mounting screw.
° Remove spring and cover. Place new spring over
pinion shaft and slide slot at end of spring over
mounting screw. Press spring and cover against
head casting.
.
Replace washer and spring cover knob. Rotate cover
counterclockwise
to tension spring. Rotate cover
approximately three full turns and tighten cover knob.
Release quill lock handle.
° Test spring tension by pulling down on crank handle
(Figure 7, Key No. 19). Adjust spring tension as
needed.
Overtightening
spring
causes quill to return with
excessive
force damaging
quill and rubber bumper
(Figure 8, Key Nos. 5 and 19).
LUBRICATION
Refer to Figures 7, 8 and 9.
Use medium weight, non-detergent oil.
DAILY:
Apply five to six drops of oil on splines at the top of
spindle (Figure 8, Key No. 4).
° Be sure cross feed lead screw (Figure 9, Key No. 20)
is clean of dirt and metal chips. Oil if necessary.
WEEKLY:
Oil cross feed lead screw (Figure 9, Key No. 20).
Oil dovetail ways.
MONTHLY:
Oil handwheel bearings through oil fittings (Figure 9,
Key No. 19).
Oil gear rack on back of quill where pinion shaft
(Figure 7, Key No. 15) engages quill (Figure 8, Key
No. 5).
° Oil depth stop lead screw (Figure 8, Key No. 17).
° Apply bearing grease to rack (Figure 9, Key No. 6)
and pinion shaft (Figure 7, Key No. 15). Remove pin-
ion knob and handle base (Figure 7, Key Nos. 17
and 20) to expose pinion shaft.
Grease longitudinal lead screw (Figure 9, Key No.
35).
8

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