Dashed lines:
A dashed line is made up of dashes of 2mm to 4mm long and a space between
of 1mm minimum.
Data sheet:
A document that provides detail information about a product.
Datum:
A datum is a point, line, or surface from which all dimensions are taken. A
datum is the place to start when manufacturing a component.
Decimal: A decimal is a number which
is based on a ten digit numerical system, that is, it shows tenths, hundredths,
etc. For example, 1,348.061.
Decimal fractions: A decimal fraction
is a fraction where the denominator is a power of ten. Decimal fractions are
commonly expressed without a denominator, eg, 8/10, 833/100, 83/1000, 8/10000
and 80/10000 are expressed as: 0.8, 8.33, 0.083, 0.0008 and 0.008.
Decimal point: A decimal point is a
'full stop' or dot that separates whole numbers from a part of a number, for
example, $99.99, where the full stop separates dollars from cents.
Denominator: Fractions are written
in the form 'a/b', and 'a' is called the numerator, and 'b'
is called the denominator.
Detail: Detail means to fully describe
the dimensions, type of material etc of an object to be fabricated.
Detail assembly drawing: A detailed
assembly drawing is a type of drawing that gives all the dimensions,
fabrication methods, and types of materials required to manufacture the article.
A detailed assembly drawing is also called a detailed drawing.
Detail drawing: A detailed drawing is
a type of drawing that gives all the dimensions, fabrication methods, and types
of materials required to manufacture the article. A detailed drawing is also
called a detailed assembly drawing.
Diameter: The diameter is the width
of a circle. It is always measured as a straight line through the centre of
the circle.
Die: A die is used to mould a shape.
Die block: A die block is the bottom
forming tool of a press brake.
Die opening: A die opening refers to
the width of the opening on a die block.
Difference:
The total that remains after one number is taken (or subtracted) from another
number.
Digit:
A digit is a number, or a combination of numbers, eg 1, 2, 3, 4, 5, 6, 7,
8, 9, 0, or 628
Dimension: A dimension is a measurement
in millimetres that describes a component on an engineering drawing. It is
always written next to the dimension line.
Dimension Lines:
A dimension line is a thin continuous line that describes a component on an
engineering drawing. It has one or two arrow heads and always refers to a dimension.
Dimensioning: Dimensioning a drawing
means adding dimensions, notes and lines to a drawing.
Disk: A disk is a thin, flat, circular
object or plate.
Divide: To divide is to work out how
many times one quantity is contained in another.
Division:
A particular type of calculation in which is determined how many times one
quantity is contained in another.
In other words, it is the process of sorting a number of items to find how many equal groups can be made or how many items will be in a group, for example, 12.
Twelve items can be sorted into one group of twelve items, or two groups of six items, or three groups of four items, or four groups of three items, or six groups of two items, or twelve groups of single items. Division is the opposite of multiplication.
Dogs:
Dogs are brackets (used with wedges) that are welded onto metal to align two
edges.
Double bevel weld: Double bevelled
weld is where one edge has two angles (eg a wedge point) abutted to another
flat edge.
Dyeline:
Dyeline machines use ultraviolet (UV) light on sensitised paper or film to
make a copy of an original drawing.