Ryobi G-2500, Owner'S Operating Manual

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OPERATION
TO STOP YOUR GRINDER
To stop the tool, squeeze the trigger switch and release.
The rear handle can be ad/- 90° to left or right side
according to the required cut.
• P ush the rear handle release button (3).
• T urn the rear handle (4) in desired direction to the end.
Make sure the handle engages in position, and the lock
button being returned.
CAUTION! Never cover air vents because they must always
be open for proper motor cooling.
This heavy duty grinder is designed for the following uses:
• R emoval of casting burrs and finishing on various types of
steel, bronze, aluminum materials and castings.
• Be veling and finishing wild seams .
• G rinding of welded sections cut by means of welding.
• G rinding of synthetic resin bricks, marbles etc.
• Cu tting thin wall tubes and small size metal materials.
TO START YOUR GRINDER
REAR HANDLE ADJUSTMENT (Fig. 5)
APPLICATIONS
FOR PROPER OPERATIONS
• Before starting the grinder, put on safety glasses and make
that the grinding wheel, guard and the tool are in good
condition and correctly fitted.
• Always hold the tool firmly with one hand on the rear handle
and the other on the side handle.
• Turn the angle grinder on and then apply the grinding wheel
to the workpiece.
• Use just enough pressure to keep the grinder from chattering
or bouncing.
• Avoid overloading the tool for a long time, heavy pressure
will decrease its speed and put a strain on the motor.
• Lift the grinder away from the workpiece before turning your
grinder off.
GRINDING OPERATIONS
Selecting Grinding Wheels
Disc Grinding Wheels
GRINDING TIPS
Grinding wheels should be carefully selected in order to use
the grinder most efficiently. Wheels vary in type of abrasive,
bond, hardness, grit size and structure. The correct type of
wheel to use is determined by the job. Use disc grinding
wheels for fast grinding of structural steel, heavy weld beads,
steel casting, stainless steel and other ferrous metals.
Efficient grinding is achieved by controlling the pressure and
keeping the angle between wheel and workpiece at 10° to
15°. If the wheel is flat, the tool is difficult to control. If the
angle is too steep, the pressure is concentrated on a small
area causing burning to the work surface.
When grinding with a new wheel be certain to grind while
pulling tool backwards until wheel becomes rounded on its
edge. New wheels have sharp corners which tend to “bite”
or cut into workpiece when pushing forward.
WARNING! Before using a grinding wheel, be certain that
its maximum safe operating speed is not exceeded by the
nameplate speed of the grinder. Do not exceed the
recommended wheel diameter.
WARNING! Excessive or sudden pressure on the wheel will
slow grinding action and put dangerous stresses on the wheel.
SANDING TIPS
WARNING! If the disc (accessory) is held flat or the back
edge of the disc comes in contact with the work, a violent
thrust to the side may result.
SANDING OPERATIONS
Selecting Sanding Disc
Sanding discs are made of extremely hard and sharp
aluminum oxide grits, phenol-resin bonded to a sturdy fiber
backing for fast heavy-duty service and long life. The discs
vary as to size and spacing of the abrasive grits. OPEN
COAT (type H) — used for soft materials and on paint or
varnish. CLOSED COAT (type K) —used for metal,
hardwood, stone, marble and other materials.
Sanding discs range in grit from 16 (very coarse) to 180
(very fine). To obtain best results, select sanding discs
carefully. Many jobs require the use of several grit sizes and
at times both “open coat and closed coat” discs are required
to get the job done faster. See chart for application examples.
For best results, tilt the Disc Sander at a 10° to 15° angle
while sanding so that only about 1" of the surface around
the edge of the disc contacts the work.
If sander is tilted too much, sanding action will be too great
and a rough cut surface or gouging and snagging will result.
Guide the Disc Sander with crosswise strokes. Be careful
not to hold the sander in one spot too long. Do not use a
circular motion, as this makes swirl marks. Test before use
on scrap stock.
Do not force or apply pressure when sanding. Use only the
weight of the tool for pressure. Excess pressure actually
slows the tool down. If faster stock removal is desired,
change to a coarser grit disc.
Remove gummy paint from metal with an “open coat” disc.
Sand until sparks start to appear, then stop and change to
a “closed coat” disc to remove any remaining paint.
Operation: Refinishing painted wood or metal surfaces.
GRIT REMARKS
To remove paint and to smooth
surface irregularities.
To remove scratches left by
previous discs.
Coarse
16-24-30
To smooth the rough sanding. Medium
36-50-80
Fine
100-120
To smooth surfaces for painting,
polishing or waxing.
Very fine
150-180
Plug the cord into a power socket;
Push safety lock-on lever (7) FORWARD (toward the
spindle) then squeeze the trigger switch (8) . (Fig. 4)
For continuous operation, push the lock-on lever while the
trigger switch is squeezed.
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