Hitachi CJ 120V, Технические данные и руководство по обслуживанию

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7. ORBITAL MECHANISM
7-1. Blade Movement
In the Models CJ 120V and CJ 120VA, the orbital mechanism moves the blade up-and-down and forward-and-
backward in the same manner as the Models CJ 110V and 110 VA. This makes the blade dig well into wood and
other soft materials and also discharges cutting chips well to achieve speedy cutting. The amount of fore-and-aft
blade movement can be adjusted just by turning the change knob to any of the four settings. The following table
shows the modeled orbits of blade movement at each orbital position (change knob position).
7-2. Orbital Position Selection
Selection of the most appropriate orbital position for each cutting job is essential to achieve the best efficiency for
cutting. However, as the best orbital position depends on such factors as the hardness and thickness of the
workpiece, the desired finish of the cut surface, and so on, it is not practical to set a single, simple standard for
best orbital position selection. Table 2 can be used as a general guide for appropriate orbital position selection
based on various factors.
Table 1 Blade movement illustration
2.3 mm (3/32")
Perpendicular
movement only
(At guide roller position)
(1/16")
1.4 mm
(1/48")
0.5 mm
Blade edge movement
Orbital position
26 mm (1")
Table 2 General guide for appropriate orbital position selection
Factor
Orbital position
Material hardness Soft material Hard material
Surface finishing Rough finish acceptable
(splintering, chipping acceptable)
Straight cutting or
curved cutting
Cutting speed Faster cutting Slower cutting
Material thickness Thick Thin
Material stability Unstable
Fine finishing
Straight cutting
Curved cutting
Very stable