Instruction Manual Glossary of Terms
Reamer:
A cutting tool used to produce a smooth, accurate hole by removing a
small amount of metal from a drilled hole.
Recessed Wheels:
Grinding Wheels made with a depression in one side or both
sides to fit special types of flanges or sleeves provided with certain grinding machines.
Reinforced Wheel:
A grinding wheel in which some type of mechanical addition has
been added as an integral part of the wheel to increase its strength.
Relief:
The offset surface immediately back of the cutting edge or face to provide
clearance on a cutting tool to allow for the non-cutting portion of the cutter to
clear the work. Some manuals call the first clearance land back of the cutting
edge the relief, and the second land the clearance. The terms of 'relief and 'clear
ance' are used synonymously in this manual, the latter being used for both primary
and secondary lands, depending on the context.
Relieving:
To remove some of the metal behind the cutting edge of a tool to pro
vide clearance, as for taps and milling cutters. Also called
backing off.
Resinoid Bond:
A bonding material described commercially as synthetic resin.
Rest:
That part of a grinding wheel stand which is used to support the work, dresser
or truing tool when applied to the grinding wheel.
Right Angle:
An angle of 90 degrees.
Right-Cut Tool:
A single-point lathe tool which, when viewed from the point end
of the tool with the face up, has the cutting edge on the right side. When used in
the lathe, the cutting edge is on the left side and cuts when fed from right to left.
Right-Hand Cutter:
A term used to describe both
rotation
and
helix
of milling cut
ters. A cutter that rotates clockwise when viewed from the spindle end is said to
have right-hand motion. A cutter has a right-hand helix when the flutes slant
downward to the right when viewed from the front, or twist clockwise when viewed
from the end.
Right-Hand Thread:
A screw thread which advances into the mating part when
turned clockwise or to the right.
Rockwell Hardness Tester:
A machine used for testing hardness by the indentation
method.
Rose Reamer:
A machine reamer designed so that all the cutting is done on the
beveled ends of the teeth instead of on the sides.
Rough Grinding:
The first grinding operation for reducing stock rapidly without re
gard to the finish the wheel leaves.
R.P.M.
Revolutions per minute.
Rubber Bond:
A bonding material, the principal constituent of which is natural
rubber or synthetic rubber.
Run-out:
Peripheral or lateral (axial) distance variation from a fixed axis center or
radial plane of a circular object.
Safety Flanges:
Special type of flanges designed to hold together the broken parts
of
a
wheel in case of breakage, thus protecting workmen.
Saucer Wheel:
A shallow, saucer-like wheel.
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