Instruction Manual Glossary of Terms
Burning
(the work) : A change in the work being ground caused by the heat of
grinding, usually accompanied by a surface discoloration.
Burr:
A turned over edge of metal resulting from punching a sheet and sometimes
from grinding or cutting off operations.
Bushing:
The material, usually lead, babbitt or aluminum, which sometimes serves
as a lining for the hole in a grinding wheel.
Caliper:
Instrument of measuring outside or inside diameters.
Cam:
A plate or cylinder which transmits variable motion to a part of a machine
by means of a follower.
Cap Screw:
A finished screw,
¼
inch or larger, used for fastening two pieces to
gether by passing the screw through a clearance hole in one part and screwing it
into a tapped hole in the other Heads may be hexagon, round, flat, fillister, or
socket types.
Carbide Tools:
Cutting tools with points of tungsten carbide, tantalum carbide, or
other cemented carbide alloys. The carbide tips are brazed to steel shanks for
strength and rigidity.
Carbon Steel:
A board term applied to tool steels other than high-speed or alloy
steels.
Carborundum:
A very hard artificial abrasive produced in an electric furnace. It
is a compound of silicon and carbide. Also, the trade name for this abrasive.
Cast Iron:
Iron which is cast in molds, is granular in form, and contains a high
percentage of carbon in the form of graphite. It cannot be rolled, forged, or
tempered.
Casting:
A part made by pouring molten iron into a mold. Sand is commonly
used for making the mold.
Center:
A fixed point about which the radius of a circle or an arc moves.
Center, Dead:
A stationary center.
Center Hole Lapping:
The cleaning or lapping of center holes with a bonded abra
sive wheel cemented onto a steel spindle.
Centerless Grinding:
Grinding the outside or inside diameter of a cylindrical piece
which is supported on a work blade instead of being held between centers, and
which is rotated by a so-called regulating wheel.
Center Line:
A line used to indicate an axis of a symmetrical part. The center
line consists of a series of long and short dashes.
Center Reamer:
A countersink having a 60-degree included angle for sizing and
smoothing center holes in workpieces to be turned or ground between centers.
Centers:
Conical steel pins of a grinding machine upon which the work is centered
and rotated during grinding.
Ceramic Tools:
A newer cutting-tool material made of aluminum oxide or silicon
carbide held together by binders or additives of other materials.
Chamfer:
To bevel or remove the sharp edge of a machined part. May be internal
or external and is expressed by the length and angle.
—115—
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