212 Agricultural Mechanics and Technology Systems
Copyright Goodheart-Willcox Co., Inc.
• Check the tool rests for correct spacing
(≤1/8″ clearance between stone and rest)
before starting the grinder, Figure 8-46.
• Turn the grinder on while standing to
one side.
• Use the tool rest to support the part
during grinding. It may be adjusted for
grinding angles as long as the standard
≤1/8″ clearance between stone and tool
rest is maintained.
• Keep the part as close to alignment with
the radius of the stone as possible.
• Apply even pressure and move the piece
continuously across the face of the stone;
never grind on the side of the stone.
• Keep the part cool by dipping it into
water while grinding.
• Pliers may be used to hold pieces that
are too small to be held by hand.
Die Grinders
Die grinders are pneumatic tools used
for fi nish work on small parts and for
shaping surfaces with intricate contours
that fi t closely with other parts. Grinding attachments,
which consist of small grinding stones, sanding drums,
or tungsten carbide or high-speed steel burrs, fi t into
the tool and typically operate at high speeds. Often
the tips are shaped to reach into tight spaces. See
Figure 8-47. Veterinarians use a type of die grinder to
repair teeth of domesticated animals.
The extreme speed at which die grinders often
operate restricts the diameter of attachments that
should be used. Attempting to use attachments
intended for slower-speed machines can create a
hazardous situation or result in failure of the tool.
Unlike using a grinding stone, using a carbide burr on
steel creates very sharp shards of waste material, so
extra eye protection and protective clothing are needed.
Stationary Surface Grinders
Stationary surface grinders are expensive
stationary tools mounted to a bench or table. They
use high-grade grinding stones to remove material
from large surfaces that must be ground to near
perfect fl atness. Surface grinders are most often found
B
MARGRIT HIRSCH/Shutterstock.com
Figure 8-47. A—A typical pneumatic die grinder.
B—The size and shape of many die grinder bits
allows them to reach into places that other grinders
cannot access.
A
Goodheart-Willcox Publisher
Goodheart-Willcox Publisher
Figure 8-46. Keep the tool rest adjusted to within 1/8″ of the
grinding stone.