Model Engineering Glossary

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m (micro)

The prefix m or micro indicates the unit should be multiplied by 10^-6.

See also: Decimal Prefixes.

m (milli)

The prefix m or milli indicates the unit should be multiplied by 10^-3.

See also: Decimal Prefixes.

M (mega)

The prefix M or mega indicates the unit should be multiplied by 10⁶.

See also: Decimal Prefixes.

Magnalite

2.5 % Copper 1.5 % Nickel 0.5 % Zinc 94.2 % Aluminium 1.3 % Magnesium

Magnesia

Chemical name: Magnesium oxide

Chemical formula: MgO

See also: Chemical Table.

Magnesium Oxide

Trade name: Magnesia

Chemical formula: MgO

See also: Chemical Table.

Magnetic Alloys

Any alloys exhibiting ferromagnetism.

Magnolia Metal

78 % Lead 6 % Tin 16 % Antimony

Mahogany

A very hard wood that is very durable and can be polished to a fine finish with a rich colour.

See also: Timber.

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Manganese Bronze

56 % Copper 1 % Tin 41.5 % Zinc 0.25 % Silicon 1 % Iron 0.25 % Manganese

Manganese Dioxide

Trade name: Pyrolusite

Chemical formula: MnO₂

See also: Chemical Table.

Manganin Alloy

84 % Copper 4 % Nickel 12 % Manganese

Marsh Gas

Chemical name: Methane

Chemical formula: CH₄

See also: Chemical Table.

Mass

The SI unit of mass is the kilogram and is equal to the mass of the International Prototype kilogram kept at Sevres, Paris and is a cylinder of platinum and iridium.

See also: Conversion of Units.

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Mazak

95.86 % Zinc 4.09 % Aluminium 0.04 % Magnesium

Mercuric Sulphide

The ore of mercury. Occuring as red crystals.

Trade name: Cinnabar

Chemical formula: HgS

See also: Chemical Table.

Metalline

30 % Copper 25 % Aluminium 10 % Iron 35 % Cobalt

Methane

Trade name: Marsh gas

Chemical formula: CH₄

See also: Chemical Table.

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Micrometer

See also: Vernier Caliper.

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Milling Machine

Machine tool used to machine materials where the workpiece is fixed to a table and moved in XYZ relative to a rotating cutting tool. They exist in two basic forms: horizontal and vertical, which terms refer to the orientation of the cutting tool spindle.

Mill X Y Axis Accuracy Check

A simple method of checking the XY axis accuracy on a milling machine.

Minofor Metal

3.3 % Copper 68.5 % Tin 10 % Zinc 18.2 % Antimony

Miralite

4 % Nickel 96 % Aluminium

Monel Metal

Strong and corrosion resistant. Applications include: turbine blades, propellers, pump fittings, condenser tubes....

29.15 % Copper 68.44 % Nickel 0.06 % Silicon 1.19 % Iron 1.02 % Manganese 0.12 % Carbon 0.008 % Sulphur

Morse Tapers

The basic dimensions.

Muntz Metal

Stonger than normal brass and used for castings and hot worked items.

60 % Copper 40 % Zinc

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