Hitachi C 12FSA Technical Data And Service Manual page 12

(9) Splinter guard, also serving for cut alignment
When rip-cutting through the end of a workpiece, a splinter may drop and be caught by the saw blade to be cut
into scattering pieces. The C 12FSA is equipped with a splinter guard to prevent such splinter cutting. Safe
cutting is ensured also in bevel cutting because the guard is tilted with the saw blade. In addition, the guard is
movable, so that mark alignment is made much easier by aligning the saw blade groove at the guard end with
the marked line on the workpiece, but only if the fence's workpiece holder surface is in alignment with the
guard end. Though the workpiece is pushed backward by the reaction during sawing, the guard supports the
workpiece and prevents deviation because the guard is positioned just behind the saw blade.
Aligning the fence's workpiece holding surface with the guard tip end can be easily accomplished by placing
the flat workpiece in tight contact with fence (A) and fence (B), hitting the guard end against the workpiece and
fixing it in position.
(10) Excellent cutting accuracy
The turn table, holder (A), and gear case are stiffened to improve the cutting accuracy. (Refer to Figs. 18 and
19 for comparison of flection when the load (P) is applied to the head.) If their stiffness is low, the forward
portion of the workpiece is lowered by the weight of the saw blade and the saw blade is raised gradually when
sliding backward. Therefore, dimensions "A" shown in Fig. 20-1 and Fig. 20-2 are widened and the accuracy
when bevel cutting becomes bad. C 12FSA can provide high accuracy as shown in Table 10 at 45˚ bevel
cutting with a workpiece 240 mm (9-7/16") in width.
Left-bevel cutting
P
Fig. 18
Right-bevel cutting
Fig. 20-1
Item
Cutting accuracy
A dimensions in
Fig. 20-1 and Fig. 20-2
Surface faced to fence
Table 10
(Unit: mm)
Maker
HITACHI C 12FSA
0.5
(0.02")
--- 8 ---
Fig. 19
Square
Cutting surface
A
Fig. 20-2