Scales - Revision history

DT Online at 15:27, 4 August 2016

2016-08-04T15:27:53Z

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	[[File:RepresentativeFraction.png\|650px\|right]]		[[File:RepresentativeFraction.png\|650px\|right]]
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			=====Features and Applications=====




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	[[File:~~Transversal_Use~~.png\|400px\|right\|Diagonal Scale\|link=https://en.wikipedia.org/wiki/File:Transversal_Use.png]]		[[File:603px-Transversal Use.png\|400px\|right\|Diagonal Scale\|link=https://en.wikipedia.org/wiki/File:Transversal_Use.png]]
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			[[File:Transversal_Use.png\|400px\|right\|Diagonal Scale\|link=https://en.wikipedia.org/wiki/File:Transversal_Use.png]]
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			=====Description=====

	A [https://en.wikipedia.org/wiki/Scaling_%28geometry%29 '''Scale'''] can be used if a full-size ''(or true-size)'' drawing would be too big to fit on the paper being used or where drawing at larger than full-size is useful to show greater detail ''(e.g. when designing a circuit board)''. They can also be used to convert units of measurement ''(e.g. objects measured in inches drawn full-size, but in millimetres on the drawing)''.		A [https://en.wikipedia.org/wiki/Scaling_%28geometry%29 '''Scale'''] can be used if a full-size ''(or true-size)'' drawing would be too big to fit on the paper being used or where drawing at larger than full-size is useful to show greater detail ''(e.g. when designing a circuit board)''. They can also be used to convert units of measurement ''(e.g. objects measured in inches drawn full-size, but in millimetres on the drawing)''.

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			{{Drawing Instruments Buyers Guide}}


	[[Category:Secondary]]		[[Category:Secondary]]
	[[Category:Graphics]]		[[Category:Graphics]]

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	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''
	There are occasions when drawing accurately to scale can provide more than a good representation, or '''[[Models and Modelling\|model]]''', of the finished product. Scale drawings can be measured from and used to transfer sizes of a complex shape on to a large sheet of material for example, but in general and with the advent of CAD, measuring off an [http://en.wikipedia.org/wiki/Engineering_drawing '''Engineering Drawing'''] is not as common as it once was - and has never been satisfactory for really accurate work.		There are occasions when drawing accurately to scale can provide more than a good representation, or '''[[Models and Modelling\|model]]''', of the finished product. Scale drawings can be measured from and used to transfer sizes of a complex shape on to a large sheet of material for example, but in general and with the advent of '''[[CAD]]''', measuring off an [http://en.wikipedia.org/wiki/Engineering_drawing '''Engineering Drawing'''] is not as common as it once was - and has never been satisfactory for really accurate work.
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	[[Category:Secondary]]		[[Category:Secondary]]
	[[Category:~~Geometry~~]]		[[Category:Graphics]]

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	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''
	There are occasions when drawing accurately to scale can provide more than a good representation, or '''[[~~:Category:~~Modelling\|model]]''', of the finished product. Scale drawings can be measured from and used to transfer sizes of a complex shape on to a large sheet of material for example, but in general and with the advent of CAD, measuring off an [http://en.wikipedia.org/wiki/Engineering_drawing '''Engineering Drawing'''] is not as common as it once was - and has never been satisfactory for really accurate work.		There are occasions when drawing accurately to scale can provide more than a good representation, or '''[[Models and Modelling\|model]]''', of the finished product. Scale drawings can be measured from and used to transfer sizes of a complex shape on to a large sheet of material for example, but in general and with the advent of CAD, measuring off an [http://en.wikipedia.org/wiki/Engineering_drawing '''Engineering Drawing'''] is not as common as it once was - and has never been satisfactory for really accurate work.
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			[[Category:Secondary]]
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	Drawing at full-size is said to be drawn at a ratio of 1 : 1 ''(i.e. i unit in reality is drawn as 1 unit on paper)''. For a drawing to be half-size 1 unit in reality would be equal to 2 units on paper, so would have a ratio of 1 : 2, quarter-size would be 1 : 4 and so on. The ratios are derived from a '''Representative Fraction''' which is given as:		Drawing at full-size is said to be drawn at a ratio of 1 : 1 ''(i.e. 1 unit in reality is drawn as 1 unit on paper)''. For a drawing to be half-size 1 unit in reality would be equal to ½ size units on paper, so would have a ratio of 1 : 2, quarter-size would be 1 : 4 and so on. The ratios are derived from a '''Representative Fraction''' which is given as:

DT Online: Created Scales

2015-02-22T10:22:25Z

Created Scales

New page

A [https://en.wikipedia.org/wiki/Scaling_%28geometry%29 '''Scale'''] can be used if a full-size ''(or true-size)'' drawing would be too big to fit on the paper being used or where drawing at larger than full-size is useful to show greater detail ''(e.g. when designing a circuit board)''. They can also be used to convert units of measurement ''(e.g. objects measured in inches drawn full-size, but in millimetres on the drawing)''.

Drawing at full-size is said to be drawn at a ratio of 1 : 1 ''(i.e. i unit in reality is drawn as 1 unit on paper)''. For a drawing to be half-size 1 unit in reality would be equal to 2 units on paper, so would have a ratio of 1 : 2, quarter-size would be 1 : 4 and so on. The ratios are derived from a '''Representative Fraction''' which is given as:

[[File:RepresentativeFraction.png|650px|right]]

{| cellpadding="5"
|-
| '''Plain Scale'''
| 
* Start by deciding how many units long the scale needs to be ''(e.g. the longest dimension on the drawing)''.
* Draw a line to represent this length to scale ''(e.g. half actual size)''
* From one end, a second line at an angle to it.
* Step off along this second line equal divisions of any convenient size up to the number of units required.
* Join the end of the last division to the end of the first line and draw lines parallel to it through all other divisions as shown.
* Sub-divide the first scale division as required using a similar procedure and start numbering the scale from the end of this.

| [[File:PlaneScale.png|350px|right]]
|-
| '''Diagonal Scale'''
| 
* It is not practical to create very small sub-divisions on Plain Scale, hence the need for a Diagonal Scale.
* Begin by creating a Plain Scale as above but draw a rectangle equal to the length of scale and any convenient height.
* Create the major sub-divisions as before ''(e.g. ¼, ½, ¾, or cm, etc.)'' and extend the divisions vertically.
* Divide the height of the rectangle into as many minor sub-divisions as are needed ''(e.g. ⅛,⅜,⅝,⅞ or mm, etc.)'' and draw horizontal lines through the points.
* Draw diagonals to each of the vertical rectangles created by extending the sub-divisions.
* Half way up, a diagonal would cross the rectangle at half its width and so on, thus providing the minor sub-divisions ''(see the example measurement shown of 3.450 metres)''.

| [[File:DiagonalScale.png|350px|right]]
|}
----
'''Note:'''
There are occasions when drawing accurately to scale can provide more than a good representation, or '''[[:Category:Modelling|model]]''', of the finished product. Scale drawings can be measured from and used to transfer sizes of a complex shape on to a large sheet of material for example, but in general and with the advent of CAD, measuring off an [http://en.wikipedia.org/wiki/Engineering_drawing '''Engineering Drawing'''] is not as common as it once was - and has never been satisfactory for really accurate work.

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