gage

(1) The thickness of sheet or the diameter of wire.  The various standards are arbitrary and differ with regard to ferrous and nonferrous products as well as sheet and wire. (2) An aid for visual inspection that enables an inspector to determine more reliably whether the size or contour of a formed part meets dimensional requirements. (3) “The ability of a material to under go plastic deformation without fracture.  The ability of sheet metal to be changed into a useful shape” (Automotive Steel Partnership, 1991, p. 8). (4.) A device used to position work in a die accurately. Another name for a checking fixture which is used to check parts.

gage pin

A round gage normally used to position work from the edge of the part.

gage study for repeatability and reproducibility, R&R

“A device used to position work in a die accurately.  Another name for a checking fixture which is used to check parts” (Automotive Steel Partnership, 1991, p. 9).

galling

See scoring.

gang-die

A series of dies mounted on a die plate.

gap-frame press

A general classification of press in which the uprights or housings are made in the form of a letter C, thus making three sides of the die space accessible. See C-frame press.

gas cylinder

A gas charged cylinder used in place of springs or die cushions in applications in which high initial pressure is required.  Also called nitrogen die cylinder, nitro-dyne cylinder, and hyson cylinder.

gibs

Guides or shoes that ensure the proper parallelism, squareness, and sliding fit between press components such as the slide and the frame.  They are usually adjustable to compensate for wear and to establish operating clearance.

grid analysis

A process used to measure the mechanical properties of a sheet metal part during a forming operation.

growing (grow)

The outward change in outer panel size that occurs during the hemming process. (See Figure G1)

guerin process

A rubber-pad forming process for forming sheet metal

guide pin

Pin or post usually fixed in the lower shoe and accurately fitted to bushings in the upper shoe to insure precise alignment of the two members of a die set.  Also called a guide post, rider pin, or leader pin.

guide pin bushing

A replaceable insert normally in the upper shoe to provide accurate alignment of both upper and lower die shoes.  Also called bushing, guide post bushing, or rider pin bushing.

guide post

See guide pin.

guide post bushing

See guide pin bushing.