A drawing picture of expanded metal, there are main term acronym label.

Expanded metal drawing with main term acronym label.

We’d like to list the abbreviations and related explanations of about expanded metal in a form as following.

Mesh Terminology
Abbreviation of Terminology Explanation
SWD
(Short Way Dimension)

The length of short diamond diagonal from one pitch point center to another pitch point center.

LWD
(Long Way Dimension)

The length of long diamond diagonal from one pitch point center to another pitch point center.

SWO
(Short Way Opening)

The length of short diamond diagonal.

LWO
(Long Way Opening)

The length of long diamond diagonal.

Bond

The solid intersection of two strands.

Pitch

Another term for SWD.

Strand Width

he length fed between the upper and lower tooling to produce the mesh.

T
Strand Thickness

Thickness of the metal that to be expanded.It is also the thickness of the material after flattening.

Burr

An edge on the inside of the mesh that may be sharp or serrated in appearance. Caused by improper clearance or worn tooling.

Whisker

An edge at the cut off of an expanded sheet or coil that looks like prongs in the shape of the mesh. Caused by a wide clearance, removal is done by wire brush or file at the expand work center.

Sheet Terminology
Abbreviation of Terminology Explanation
XM

Raised or standard material in its original form coming off the expand work center.

FXM

The result of passing (feeding) the standard material through a cold roll reducing mill to a defined specification that produces a uniform thickness of the entire sheet.The material elongates parallel to the feed direction creating a longer sheet in the feed direction and may reduce the size of the of the sheet opposite of the feed direction.

  • FXM Straight Rolled
  • Flattening parallel to LWD
  • FXM Cross Rolled
  • Flattening parallel to SWD
Semi-Flat

The result of passing (feeding) the standard material through a cold roll reducing mill to a defined specification that produces a less than uniform thickness of the entire sheet.The product is not flat by definition but somewhere between standard and flat.

Touch Pass

The result of passing (feeding) the standard material through a cold roll reducing mill to slightly knock down the Bond.

XS

Shorts, expanded material to be flattened.

SWM
(Short Way Mesh)

The dimensional (US/Metric) size parallel to the SWO of the sheet or coil.

LWM
(Long Way Mesh)

The dimensional (US/Metric) size parallel to the SWO of the sheet or coil.

Crow’s Feet

This can be result of improper manufacturing and/or incorrect raw material length. These are open bonds that resemble a crow’s foot.

Manufacturing Terminology
Abbreviation of Terminology Explanation
M/R
(Machine Run)

Expanded metal mesh or walkway grating as it comes off the expander.

Random Sheared

R/S, expanded metal mesh or walkway grating that is sheared or cut to a defined size without specific requirements. Sheet size can be held to tight tolerance. Likely to have open meshes.

Bond Sheared

B/S, expanded metal mesh or walkway grating that is sheared or cut to a defined size on the bond or knuckle.Sheet size is dependent on where the bond falls during the M/R process. Produces closed meshes.

Balance Bond Shear

BB/S, an older term not much used, expanded metal mesh or walkway grating that is sheared or cut to a defined size along a center line on the bond or knuckle.Sheet size is dependent on where the bond falls during the M/R process. Produces closed uniform meshes.This process can be achieved through a M/R expand.

Mesh Blank

The amount of raw material being fed into the expander to make an expanded finished length.

Blank

The combined total amount(s) of the mesh blanks being fed into the expander.

Hold Down

The amount of raw material not expanded during the expand process.It is important to keep this to a minimum, the dimension varies for each expand work center.

Drop

Another term for hold down.

Trim Cut

The amount of raw material used to square the raw material prior to the expand process. In a sheet feed operation, this is done at every new sheet.It is required this be kept at four strokes.

Line Out

The final process of expand work center set-up that finalizes specifications before the work-order begins.

Camber

The greatest deviation of a side–edge, from a straight line. Parallel to the LWD, touching both ends of the sheet.It is natural for expanded materials to have this condition as it comes off the press.

Out Of Square

The condition of not having 90 degree angles on the corners of the sheet also measured by placing a straight edge, parallel to the SWM.This is also natural for expanded materials to have this condition as it comes off the press.

Clearance

The distance between the upper and lower tooling. It is measured with shims and is varied depending on the expand work center and material being expanded.

Tooling

The forming and cutting materials used to produce expanded mesh. Upper tooling does the forming and comes in many shapes and sizes. Lower tooling is a flat surface that acts as a shear. The upper tool passes in front of the lower tool much like scissors to produce mesh.