stationary or portable grinder. No maintenance is necessary; however, replace brushes when they wear
Figure 3-12. Power wire brushes
b. Power Sanders. Use power sanders to remove paint or corrosion from metal and wood
surfaces and to smooth surfaces for finishing. There are many types of power sanders available, but the
sanders you will use most are the portable vibrator; the belt, disc, and drum floor sander; and the floor
edger. You must wear safety goggles or a face mask while using sanding machines. Start all portable
sanders before placing them on the work area.
(1) Portable vibrator sander. A portable vibrator sander (electric) is a small machine with an
abrasive sheet clamped on it. An orbital vibrator sander, shown in Figure 3-13, is small enough for you
to hold in one hand while sanding. This tool is excellent for removing old paint and varnish and for
sanding drywall joints. No maintenance is necessary on this machine.
(2) Portable belt sander. Use a portable belt sander (Figure 3-14) for finishing work and for
fast and efficient sanding of wood surfaces. The sander uses an endless, abrasive-coated belt that runs
over two flat pulleys. You will need to use both of your hands to operate the sander, and you must use
extreme caution to ensure that the sander does not cut the wood surface too deeply. Occasionally clean
the sander with compressed air.