Hitachi C 8FC Manual page 13

Item Phenomenon
1 Poor Cutting Accuracy
2 Rough Cut Surface
Parallelism A = 0.02/44
A
Washer (C)
Washer (C)
Fig. 14
Possible Cause (s)
h. The swivel portions of
the Hinge and Gear
Case are either loose
and move with
excessive play, or fail
to move smoothly
because of excessive
fricton. This causes
unwanted movement
of the Gear Case,
applies excessive
pressure on parts, and
causes deformation of
various components.
i. Excessively fast
cutting operation
causes deflection of
the Saw Blade, and
reduces cutting
accuracy.
j. Excessive pressure is
applied during cutting
due to a dull or
damaged Saw Blade.
k. The workpiece is
warped, bent or
deformed, causing it
to slip during cutting.
a. Excessive deflection
of the Saw Blade.
(Excessive deflection
causes rought cutting
A
surface.)
b. Damage of Washers
(C) causes inaccurate
parallelism.
c. Inaccurate
perpendicularity
between the Turn
Table and the Saw
Blade causes the Saw
Blade to cut through
the workpiece at a
slight angle, causing a
rough cutting surface.
Factory Standard
----
----
----
----
0.15/200
(Based on
dummy disc
alignment)
0.02/44
(see Fig. 14)
0.15/100
(Based on
dummy disc
alignment)
(see Fig. 9)
--- 13 ---
Inspection, Repair, Adjustment
•
Check for foreign matter
(cutting chips, etc.) in the
fittings of the Hinge [8], Gear
Case [51], and Gear Case Pin
[41]. Remove as necessary.
•
Check if the M5 x 10 Hex.
Socket Set Screw [16] which
fixes the Gear Case Pin [41]
is loose.
Tighten as necessary.
•
Reduce cutting speed.
(For a 60 mm-square
workpiece, the cutting
operation should be from 6 to
9 seconds.)
•
Resharpen or replace the Saw
Blade.
•
Remove the defects from the
workpiece with a planer, and
cut it again.
•
Same as Item 1-b.
•
Repair damage on Washers
(C) [99] and [101], or replace
them if beyond repair.
•
Same as 1-a.