--- 27 ---
(4) Then, tighten hexagon socket set screw
M8 x 16 and to eliminate the play.
(5) Finally, check the perpendicularity of the
saw blade with relation to the upper
surface of the base [tolerance: 0.15/100
mm (0.006"/4")]. If it is not within
tolerance, adjust 6 mm bolt (A) as
necessary (see paragraph 9-1, "Bevel
Angle Adjustment").
Hexagon socket set screw M8 x 16
Fig. 49
Slide pipe (A)
Holder hole
diameter is 32 mm dia. (1.26" dia.)
Lock nut M8
Bushing
Holder (A)
Slide pipe (A)
outer diameter is 32 mm dia. (1.26" dia.)
3
4
9-3. Structure of the Ball Bushing (Linear Bearing)
(1) The ball bushing is commonly called
a linear ball bearing. Inside the
bearing is elongated guide grooves
in which steel balls circulate and roll
when a load is applied (as indicated by
the arrow marks in Fig. 50). This type
of device is widely used in automated
machine tools.
The advantage of the ball bushing is
that its friction coefficient remains
largely uncharged even when the load
is increased, ensuring smooth sliding
movement.
Fig. 50
In addition, slide pipe (B), made of bearing steel and heat treated to a high degree of hardness, is highly
resistant to wear. Salespersons should have a good understanding of the structure and rugged characteristics
of this exceptional mechanism to enhance sales promotion.
(2) Lubrication
If it is necessary to replace the ball bushing, apply approximately 2 grams (0.071 oz) of grease (Hitachi Motor
Grease, Code No. 930035, is recommended) on the steel balls and within the guide grooves of the new ball
bushing. If grease is not applied, it will shorten the service life of the ball bushing, and subsequent abrasive
contact between the steel balls and slide pipe (B) will cause abnormal noise during slide cutting operations.
Customers should be instructed to thoroughly remove saw dust and other foreign matter from slide pipe (A)
and slide pipe (B) and liberally coat them with machine oil at least once a month.
No-load side
ball bushing
Load side
ball bushing
Slide pipe (B)
Ball bushing
Steel balls move by rolling
Front Rear
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