Stroke Sander

A machine that makes sanding contact by ?stroking? the back of a moving coated abrasive belt with a back-up block or pad in the slack of belt area.

Strong Shaped Grain

Abrasive grain more wedge shaped and/or blocky in shape as opposed to a slivery or weakened shape (needle) grain.

Surface Finish

The quality of a workpiece finish expressed in RMS or other quantifiable or subjective measure.

Surface Grinding Machine

A machine for grinding or finishing plane (flat) surfaces.


The mixture of workpiece residue and abrasive particles with grinding aid (water, oil) created by abrading action.

Swingframe Grinder

A grinding machine suspended by a chain at the balance point so that it may be turned and swung in any direction, for the grinding of billets, large castings, or other heavy work too large or heavy to take to the machine.

Swirl Marks

Circular grinding marks or scratch pattern left by rotational type tools such as discs.


Refers to a coated abrasive cloth backing other than cotton (e.g. polyester, rayon, etc.).

Silicon Carbide

A manufactured abrasive made from coke and silica sand (SiC).

Seaming Glass

Smoothing and easing of the edges and corners of flat glass; beveling.

Sectional Belt (Segmented)

A coated abrasive belt made of sections spliced together to produce belt widths greater than the maximum product coating width. Contains two or more splices per belt.

Serrated Contact Roll

Contact roll or wheel with grooves spirally cut into the face to increase the cutting action of the coated abrasive belt and prolong belt life.


Surface Feet Per Minute

SG Abrasive

A non-fused alumina abrasive having uniform crystalline structure with unique fracturing characteristics. SG (Seeded Gel) is frequently referred to as ceramic aluminum oxide.


Term used to denote the loss of abrasive grain from a product during the grinding process by means other than attritive wear.


See Shedding.


Referred to as a platen or smoothing bar. A flat metal support located behind the coated abrasive belt. Frequently faced with felt or vinyl foam tape to provide resiliency and produce improved finish.

Shore Durometer

A method of rating the hardness of rubber, plastic, or other elastomeric material.

Sealer Sanding

Removing the roughness to level the surface and promote adhesion of the finish coats.

Sealer Coat

A thin coat of finishing material designed to seal the pores and surface of wood to resist penetration and promote adhesion of the final finish coatings.

Sanding Room

Designates a department in a furniture plant that is devoted primarily to machine sanding of white wood dimensioning stock prior to assembly.

Satin Finish

A smooth but not highly reflective surface finish on metal.


A precision leveling of the coated abrasive surface to ensure against scratching of soft materials.

Scalloped Edge Belts

Belts with edges slit in the pattern of a scallop. Used to overhang the edge of a contact wheel to grind or polish a fillet in a workpiece.


An instrument for determining the relative hardness of material by a drop and rebound method.

Scored Rolls

Coated abrasive roll material with parallel slits evenly spaced in the length direction. Used for making assemblies.


Marks left on a ground surface by dirty coolant contamination or improper coated abrasive specification for the operation.

Short Scratch

Generated by a contact roll application as opposed to a stroke sander or platen type operation.

Single Flex

A controlled breaking of the adhesive bond of a coated abrasive product at a 90 degree angle to the length. The coated abrasive product is stiff in one direction, flexible in the other.

Size Coat

Second adhesive coat applied to a coated abrasive product. The ?size? coat unites with the maker coat and insures the final anchoring of the grain and proper total adhesive level to the finished product.

Spool Sanding

Sanding convex or concave profiles on curves such as mirror frames, headboards, and other compound shapes using slotted discs (see DeLappe discs).

Spray Mist

A method of supplying coolant to the workpiece or coated abrasive belt during metal finishing operations, as opposed to a full flood coat.

Stamping Burr

A burr caused by stamping dies.

Steady Rest

A support for workpieces being ground on a cylindrical grinding machine.

Straight Line Sanding

Refers to a simple reciprocating type hand sander as opposed to a sander employing orbital motion.


Refers to a method of applying a workpiece to the unsupported portion of the belt, to conform to irregular shapes. Also, refers to a method of hand application of coated abrasives i.e., using a strip of coated abrasives shoeshine fashion.

Stress Relief

See Back Pass.


Elongation of a coated abrasive product use (normally refers to stretch of the coated abrasive belt).

Strip Scouring

The process of removing stains, oils, films, oxide skins, and any other surface defects that would disqualify coils or strip steel from being used as decorative trim.


See Arbor.


Coated abrasive forms other than sheets, rolls, belts and discs (i.e. flap wheels, cones, etc.).


Refers to the grain removal and taper operation performed on both laps (ends) of coated abrasive belt prior to joining the two laps. Necessary in order to achieve adequate adhesion and desired splice thickness.

Slack of Belt Sander

A machine configuration in which the workpiece is presented to the coated abrasive belt in the area between the two pulleys. Work applied to unsupported area of belt.

Slag Grinding

A wide belt conveyor type grinding operation that replaces portable tool grinding methods for removing slag, scale, and torch splatter from the surface and edges of flame cut and/or plasma cut steel parts.


Thin, elongated fragments of metal that have been rolled into the surface of the parent metal and are attached by only one end.

Slotted Discs

Coated abrasive discs containing numerous radial slots cut from the outside periphery.

Slurry Coat

Refers to a coating method in which the abrasive grain and adhesive are mixed together and metered onto the backing in one continuous coating.

Smoothing Bar

A platen type device backing up the coated abrasive belt at the point of contact with the workpiece. Usually covered with graphite canvas to reduce frictional heat. Used on wide belt machines in woodworking, particleboard and plywood sanding to promote better finishes.


Grinding the gates, fins, and sprues from castings.

Soluble Oil

An emulsified oil that forms an emulsion when mixed with water. Typically used as a grinding aid to increase belt life. Opaque, usually milky in color.

Stripped Grain

See Shedding.

VSM Abrasives Co.
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