Orbital Mechanism And Blade; Blade Movement; Orbital Position Selection - Hitachi CJ 14DSL Technical Data And Service Manual

ORBITAL MECHANISM AND BLADE

1. Blade movement

In the Model CJ 14DSL, the orbital mechanism moves the blade up-and-down and forward-and-backward.
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).

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 hardness and
thickness of the workpiece, 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 1 can be used as a general guide for appropriate
orbital position selection based on various factors.
Table 1 General guide for appropriate orbital position selection
Factor
Material hardness
Material thickness
Cutting speed
Straight cutting or
curved cutting
Surface finishing
Material stability
Soft material
Thick
Faster cutting
Straight cutting
Rough finish acceptable
(splintering, chipping acceptable)
Unstable
Orbital position
III II
-7-
I 0
Hard material
Thin
Slower cutting
Curved cutting
Fine finishing
Very stable