Ryobi JS550LK User Manual download pdf (Page 9)

-6-

III

2.0 mm (5/64”)

1.2 mm

(3/64”)

0.6 mm (1/32”)

20 mm (3/4”)

1. Blade Movement

In the Model CJ 90VST, the orbital mechanism moves the blade up and down, and back and forward. The

amount of fore-and-aft blade movement can be adjusted by simply switching the change knob to any of the

four settings. The table below shows the modeled orbits of blade movement at each orbital position

(change knob position).

III II I 0

Orbital positionBlade edge movement

Perpendicular

movement only

2. Orbital Position Selection

Selecting the most appropriate orbital position for each cutting job is essential to achieve the best possible

cutting efficiency. However, as the best orbital position depends on workpiece hardness and thickness, the

desired finish of the cut surface, and other factors, setting a single, simple standard for selecting the best

orbital position is not practical. Table 1 below can be used as a general guide for the appropriate selection

of orbital position based on various factors.

Table 1 General guide for appropriate selection of orbital position

Orbital position

Factor

III II I 0

Material hardness Soft material Hard material

Material thickness Thick Thin

Cutting speed Faster cutting Slower cutting

Straight cutting or

curved cutting

Straight cutting Curved cutting

Surface finish

Rough finish acceptable

(splintering, chipping acceptable)

Fine finish

Material stability Unstable Very stable

* Set the orbital position to "0" independently of the cutting speed when cutting a small arc or curved line by

using a guide (sold separately).

ORBITAL MECHANISM AND BLADE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 22 23

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Ryobi JS550LK User Manual Page 9