Instruction Manual Glossary of Terms
Slotting Wheel:
A thin grinding wheel, usually organic bonded, used for cutting
slots or grooves in the work piece.
Spanner Wrench:
A type of wrench having a hook or equipped with pins for tighten
ing or loosening threaded circular collars which have either slots or holes to receive
the hook or pins on the wrench.
Spindle
(grinding): Often used synonymously with "quill", the term usually refers
to a precision bearing mounted shaft inside a housing with end caps which hold or
tighten and compress the bearings and shaft in a fixed position.
Spindle
(workhead): Precision bearing mounted hollow steel sleeve with internal
taper inside a housing, used to hold workholding arbors by means of an internal
taperlock.
Spring Collets:
A type of draw-in collet made of hardened steel and having three
slots or saw cuts which permit the collet to be closed tightly upon the workpiece
when drawn back against a tapered sleeve by the draw bar or tube.
Stagger-Tooth Cutters:
Side-milling cutters in which the teeth have alternating helix
and the "drag" ends are eliminated to provide more chip clearance
Standard Tapers:
Any of the numerous tapers specified in the American Standard
system of tapers which include the self-holding tapers
Steady Rest:
A support attached to the ways of a lathe or grinding machine for
turning long workpieces. The steady rest is used to prevent slender work from
springing away from the cutting tool or wheel, or to permit machining operations
to be performed on the end of the workpiece. Sometimes called a
center rest.
Stops:
Devices attached to the movable parts of a machine tool, such as a grinder
table, to limit the amount of travel. When set and clamped in position, they assure
the uniformity of each workpiece. Projections on the side of the worktable may
also engage automatic power feed, and are known as a 'dog'.
Straight Wheel:
A grinding wheel of any dimension which has straight sides, a
straight face, and a straight or tapered arbor hole, and is not recessed, grooved,
dovetailed, beveled or otherwise changed from a wheel with plain parallel sides.
Structure:
A general term referring to the proportion and arrangement of abrasive
and bond in an abrasive product.
Stub:
That portion of a grinding wheel remaining after it has been worn down to
the discarding diameter.
Surface Grinding:
Abrasive machining which grinds flat surfaces on work pieces
having sides parallel or at angles to each other.
Surface Roughness Scale:
A series of small plates visualizing the degree of rough
ness for a particular surface. They establish a standard permitting a machinist or
an inspector to compare specified finishes visually and by feel.
Table:
That part of the grinding machine which directly or indirectly supports the
work being ground.
Table Traverse:
The length of reciprocating movement of the table of a grinding
machine.
Tailstock:
The part of a machine tool which holds one end of a work piece with
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