Starrett St-1101, Instruction Manual

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6 REV A JAN/10
2.2 General Description:
2.2.1 Arc Assembly
The machine comprises of a sturdy Arc (10) provided with 2 Wheels: one
Idler Wheel (25) and one Drive Wheel (21), the latter coupled to a Speed Reducing
Gear. The Idler Wheel (25) is mounted on the shaft of a Saw Blade Tension Device
(09).
A welded Saw Blade (06) is mounted around the two wheels and
conveniently tensioned by the Tensioning Device (09), to keep the blade properly
tensioned by the Wheels (21)(25). The Arc (10), in turn, is mounted on the Vise
Assembly (08) through a shaft that allows the arc to pivot on the saw plane, thus
creating a cutting plane (figure 01A). The Blade (06) and Wheels (21)(25) are duly
protected at the back of Arc (10) by a Protective Cover (23) (figure 02).
In order to move the Arc (10) upwards (figure 04), it should be first
unlocked by the Arc Lock Knob (15).
The machine is so designed as to cause the Arc (10) to swivel around a fixed
point on the Vise Assembly (08), i.e., along a plane at right angles to the Cutting
Table (03), to allow for angular cuts to be made on the material to be cut (figure 10).
The cutting pressure of the Saw Blade (06) on the material is set through a
Spring System (20) (figure 07), which is part of the Arc assembly (10). Such spring
system allows for 3 settings to be available: HIGH (H), MEDIUM (M) and LOW (L),
duly marked on the Wheel (19), as can be seen in figure 08.
The Saw Blade cutting segment (06) is supported by two Guides (26)(28).
Such Guides are provided with Ball Bearings (27), which allow the blade to be
twisted by 45º relative to the rotation plane of Wheels (21) (25), to form the cutting
plane. Such Ball Bearings (27) are intended to align and prevent the Saw Blade (06)
from laterally deflecting around the axis of its track movement. The Moving Guide