Skil 9105 - Grinding Operations

Grinding Operations
Use disc grinding wheels for fast grinding of structural steel, heavy
weld beads, steel casting, stainless steel and other ferrous metals.
GRINDING TIPS
Efficient grinding is achieved by controlling the pressure and keep-
ing 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.
A enn Excessive or sudden pressure on the wheel will
z ie slow grinding action, causing the circuit breaker to
trip, and put dangerous stresses on the wheel.
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 work-
piece when pushing forward.
Sanding Operations
BACKING PAD
UN nat Before attaching a backing pad be sure its max-
mimes imum safe operating speed is not exceeded by
the nameplate speed of the tool.
NG | Wheel guard may not be used for most sanding
Momeni operations. Always reinstall wheel guard when
converting back to grinding operations.
TO INSTALL BACKING PAD AND SANDING DISC
Disconnect too! from power source. Set the tool on its top side
(spindle up). Place the rubber backing pad onto the spindle shaft.
Center the sanding disc on top of the backing pad. Insert the lock
nut through the disc and thread onto the spindle as far as you can
with your fingers. Hold spindle with the spindle lock wrench, then
tighten the backing pad securely with lock nut wrench (Fig. 2).
TO REMOVE BACKING PAD AND SANDING DISC
Disconnect tool from power source. Using the lock nut wrench
unscrew the nut from the spindle while holding spindle with the
spindle lock wrench.
SPINDLE
HANDLE
SANDING
DISC
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 fong 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
where ground of particles are fine.
Sanding dises 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.
OPERATION: Refinishing painted wood or metal surfaces.
REMARKS GRIT
To remove paint and to smooth Coarse
surface irregularities. 16-24-30
To smooth Medium
the rough sanding. 36-50-80
To remove scratches left by Fine
previous discs. 100-120
To smooth surface for painting, Very Fine
polishing or waxing. 150-180