Model Engineering Glossary

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G (giga)

The prefix G or giga indicates the unit should be multiplied by 10⁹.

See also: Decimal Prefixes.

Gas Turbines

Although practical model jet engines have been around since the early 1980's it has only been in the past few years that home construction has become viable. Careful design has made simple home construction possible using basic tools and a small centre lathe. more......

Gauge

See also: Birmingham Sheet Metal Gauge (B.G.), Railway Gauge, S.W.G. British Imperial Wire Gauge.

Gears

A rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque.

The gears in the image are on a single cylinder 4-stroke gas engine and are at a 2:1 ratio to drive the valves - Gas Engine based on Joe Webster′s Design.

Glass Cement Alloy

40 % Lead 26.66 % Tin 33.33 % Bismuth

Glauber's salt

Chemical name: Sodium sulphate

Chemical formula: Na₂SO₄10H₂O

See also: Chemical Table.

Glue

There are numerous glues out there, but what do you use and when? more...

See also: Adhesive Terminology.

Glycerine

A raw material used in foodstuffs and printing ink amongst other uses.

Trade name: Glycerol

Chemical formula: C₃H₅(OH)₃

See also: Chemical Table.

Glycerol

A raw material used in foodstuffs and printing ink amongst other uses.

Chemical name: Glycerine

Chemical formula: C₃H₅(OH)₃

See also: Chemical Table.

Glyco Metal

70 % Lead 8 % Tin 22 % Antimony

Goldine

90 % Copper 10 % Zinc

Gong Metal

80 % Copper 20 % Tin

Graphite

The other form of crystalline carbon is diamond. Often used as a lubricant.

Chemical formula: C

See also: Chemical Table.

Graphite Alloy

68 % Lead 15 % Tin 17 % Antimony

Green Gold

25 % Silver 75 % Gold

Green vitriol

Also known as melanterite.

Chemical name: Ferrous sulphate

Chemical formula: FeSO₄7H₂O

See also: Chemical Table.

Gudgeon Pin

This pin provides the articulated connection between the conrod and the piston.

The picture to the left shows a piston and conrod with a drill bit taking the place of the gudgeon pin.

Gunmetal

This is a copper-tin alloy, similar to bronze, used where resistance to corrosion and/or wear required.

Composition: 88% copper, 8% tin, 4% zinc.

Gypsum

Used to make plaster of paris and plaster.

Chemical name: Calcium sulphate

Chemical formula: CaSO₄2H₂O

See also: Chemical Table.

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