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Model Engineering Glossary


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z



B.A. Threads

Tapping and clearance drills are listed here. more......


Babbit's Metal

Patented by Isaac Babbitt as a bearing metal due to it's excellent low friction properties.

11.11 % Copper 66.66 % Tin 22.22 % Antimony


Back Gears

Gears fitted to a machine to increase the number of spindle speeds obtainable with a cone or step pulley belt drive.

See also: Lathes.


Back Rake

The angular surface ground back from the cutting edge of cutting tools. On lathe cutting tools. the rake is positive if the face slopes down from the cutting edge toward the shank, and negative if the face slopes upward toward the shank.


Backlash

The lost motion or looseness (play) between the faces of meshing gears or threads.


Bandsaw

A power saw. the blade of which is a continuous, narrow, steel band having teeth on one edge and passing over two large pulley wheels.

I think a bandsaw is the one must have power tool for the workshop.

The Proxxon MBS-240e Bandsaw is a very small lightweight hobby bandsaw where as the Record BS250 Bandsaw is a larger more powerful bandsaw that can be used for some serious metal working and spare blades of different tpi are readily available.



Bar Stock

Metal bars of various lengths, made in flat, hexagon, octagon, round, and square shapes from which parts are machined.


Bastard

Threads, parts, tools, and sizes that are not standard, such as 'bastard nuts,' "bastard plus," "bastard fittings,' and so forth. The term also refers to a standard coarse cut file.


Bauxite

Chemical name: Hydrated aluminium

Chemical formula: Al2O32H2O

See also: Aluminium, Chemical Table.


Bed

A very hard wood almost unaffected when exposed to water. Therefore, it is used for keels of ships and flood gates. On account of its hardness it was used for wheels and railway sleepers.

See also: Lathes.


Beech

A very tough and elastic timber used for oars, blocks and pulleys, spokes of wheels and milk-pails. However, it is not very flexible and is difficult to work. Ash bark is used tanning and the ashes of ash is used for potash.

See also: Timber.

Bell Metal

As per the name bells are cast from this.

80 % Copper 20 % Tin


Bell Mouth

The flaring or tapering of a machined hole, usually made at the entrance end because of misalignment or spring of the cutting tool.


Belt Drive

There are many different forms of belts, but essentially they are a means of transmitting power between rotating parts (eg electric motor and input shaft on a pillar drill).

This image shows a belt drive conversion on a Mini Mill, details of the conversion are available here.



Bench Grinder

Wheels of a hard abrasive, such as Carborundum directly driven by an electric motor. It is worth looking for a grinder with a minimum power of 250W.

This is a bench grinder as it is mounted on the bench and not floor standing or an attachment to a drill or lathe.

A full review of the Warco 8" Bench Grinder.



Bench Lathe

A small lathe mounted on a bench or table.

Lathes are used for many engineering operations: boring, facing, screwcutting...

Some basic hints, tips and other links for further information are available from here. more......



Beryllium Copper

A high strength with non-magnetic and non-sparking copper alloy with 0.5 to 3% beryllium and sometimes other alloying elements. more...


Billet

Rectangular or square bar of raw material.


Birch

Strong flexible wood that has many uses. Amongst the uses are furniture making, building as well as being used for agricultural implements in the past.

See also: Timber.

Birmabright

92 % Aluminium 7 % Molybdenum 1 % Manganese


Birmingham Sheet Metal Gauge (B.G.)

This is a numbering system for sheet metal gauge. more......

Blackening Steel

The traditional technique is to heat the steel part up to cherry red and then qunech in a pot of old engine oil. Be careful as it can have a tendency to catch fire. Some repeat this process a few time to get a good finish. There are alternative methods. more...


Bleaching powder

Chemical name: Calcium hypochlorite

Chemical formula: CaCl(OCl)

See also: Chemical Table.


Blind Hole

A hole made in a workpiece that does not pass through it.

See also: Drill Bits.


Blowhole

A defect in a casting caused by trapped steam or gas.

See also: Cast Iron.


Blue vitriol

Chemical name: Copper Sulphate

Chemical formula: CuSO45H2O

See also: Chemical Table.

Boiler

Section through a small copper boiler.


Section through the firebox area showing the rivets and stays that have been in this case TIG welded.



Bolt

See also: B.A. Threads.


Borax

Chemical name: Sodium tetraborate

Chemical formula: Na2B4O710H2O

See also: Chemical Table.


Bore

To enlarge and finish the surface of a cylindrical hole by the action of a rotating boring bar (cutting tool) or by the action of a stationary tool pressed (fed) against the surface as the part is rotated.


Boring Bar

A combination tool holder and shank.

This image shows a homemade boring bar being used in a Warco WM240b lathe.



Boring Tool

A boring tool is used to enlarge a cylindrical hole, sometimes the tool bit the boring bar and the tool holder are incorporated in one solid piece.


Box Wood

Very compact hard wood suitable for machining small parts from.

See also: Timber.


Brass

Brass is an alloy of copper and zinc, but often other elements such as aluminium, iron, manganese, tin and lead are added. more......


Britannia Metal

2 % Copper 90 % Tin 8 % Antimony


British Association Threads

See: B.A. Threads


British Imperial Wire Gauge (S.W.G.)

See: S.W.G. British Imperial Wire Gauge


British Standard Whitworth (BSW) Threads

Tapping and clearance drills are listed here. more......


Broach

A long, tapered cutting tool with serration's which, when forced through a hole or across a surface, cuts a desired shape or size.


Bronze

Bronze is an alloy of copper and tin. However, the name is now applied to other alloys that do not contain tin. more......


Buff

To polish to a smooth finish of high luster with a cloth or fabric wheel to which a compound has been added.


Bull Gear

The large crank gear of a shaper.


Burnishing

The process of finishing a metal surface by contact with another harder metal to improve it. To make smooth or glossy by or as if by rubbing; polish.

Burr

The sharp edge left on metal after cutting or punching.

or

A rotary cutting tool designed to be attached to a drill.


Bushing

A sleeve or a lining for a bearing or a drill jig to guard against wear.


Butter of zinc

Chemical name: Zinc chloride

Chemical formula: ZnCl23H2O

See also: Chemical Table.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z