Butt Splice (Belt)

Two pieces of coated abrasive ?butted? together (with no overlap) to form an endless belt. A very strong, thin, reinforcing patch is used on the back of the splice to hold it together.


A flexible or semi-rigid material to which abrasive grain is bonded by an adhesive. Paper, cloth, fiber and combination are the major backings used for coated abrasives.

Back Pass

A light grinding cut taken on the bottom (back) side of coil or sheet material to relieve stresses from rolling, and to prevent distortion from occurring during subsequent grinding or polishing operations on the finish side.


One of the most popular and common industrial abrasive belt machines for offhand, or other grinding and polishing. Basically consists of a contact wheel and one or more idlers for tensioning and tracking the belt.

Back-Up Pad

Usually a rubber or composition type material to which an abrasive disc is attached. The back-up pad supports the disc during the grinding operation and is normally the same diameter, or slightly smaller, than the disc.

Balance (Dynamics)

A static balanced wheel, or roll, in balance at operating RPM.

Balance (Static)

A wheel or roll is in static balance when centered on a frictionless horizontal arbor, it remains at rest in any position.

Bands (Abrasive)

Spirally-wound and bonded to an inner liner, these cylindrically-shaped cloth specialties are used on expanding rubber drums for sanding and polishing hard to get at corners, grooves and contoured surfaces.

Barber Pole

A spiral pattern produced on a workpiece during centerless or cylindrical grinding. Normally caused by improper operating conditions.

Batch System

In rough lumber sanding, several boards of equal or unequal widths of the same relative thickness are accumulated side by side into a unit roughly equal to the width of the abrasive belt in use. This ?batch? is then fed into the sander and all the boards are sanded simultaneously.

Bowed Edge

A condition affecting one or both edges of a coated abrasive belt, or roll. The belt, or roll, will arc or skew in one direction when laid out on the floor instead of following a straight line. Normally one edge is longer than the other.

Breaker Rolls

Rolls positioned before and after the grinding heads to bend strip or coil stock over the billy roll to insure straight cylindrical contact at the point of grinding.

Brinnel Number

A hardness rating obtained from the Brinnel test; expressed in kilograms per square millimeter.

Brinnel Test

A test to determine the hardness of a material in which a steel ball, one centimeter in diameter, is pressed into the material with a standard force (usually 3,000 kilograms). The spherical surface area of indentation is measured and divided into the load with the results expressed as the Brinnel number.


The smoothing and brightening of a surface, utilizing an abrasive compound applied to a fabric-type wheel or belt.


See Noseblock.

Burning the Work

A change in the characteristics of the work piece being ground. Normally detected by a surface discoloration or distinct ?burning? odor.


Refining a surface using fine grit coated abrasives to create a special effect with minimum stock removal.


A thin, ragged fin, left on the edge of a piece of metal by a cutting tool (including coated abrasives).


The substance used to adhere the grain to the backing on a coated abrasive product. See Adhesive.


An automobile body in the intermediate assembly stage having a ?raw? metal surface. During this phase the defects in the sheet metal surfaces are removed and repaired, and exposed metal-to-metal joints are filled with lead solder.

Belt Guard

A protective device covering the abrasive belt which is normally an integral part of the grinding machine. Used to protect operators and bystanders from personal injury.

Belt Splice

Area of an abrasive belt where the two ends are joined together with an adhesive to make an endless belt. See Butt Splice and Lap Splice.

Belt Splice Marks

A pattern left on the workpiece at regular intervals, normally caused by a belt splice specification that is not suitable for the application.

Belt Tension

The force or strain put on a coated abrasive belt by the idler during use, normally ex-pressed in pounds per inch of belt width.

Bench Backstand

An offhand grinding machine attached to a bench. Usually has either one or two wheels mounted on a horizontal spindle with idlers to tension and track the belts.

Bi Flex

See Double Flex.

Billy Roll

A pneumatic or hydraulic actuated pressure roll used to force the work against a wide coated abrasive belt.


Using abrasives to develop a consistent finish over an entire workpiece, as on a welded area.

Board Foot

A unit of measurement for lumber equal to the volume of a board 12? x 12? (i.e. 144 cubic inches).


A metal or plastic insert used to alter the size of a center hole (primarily in rolls or flap wheels) to accommodate a smaller mandrel or arbor.

VSM Abrasives Co.
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