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- Mar 17, 2019
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- 113
The scale is stated in the form of n : n (number : number) i.e. the left side is the scaled down unit used on paper : the right side is the full size measurement of the subject in real life the left side is equal to.
Firstly, if the scale given does not specify a unit of measure you can choose whatever unit of measure you desire: metric or imperial, but it MUST initially apply to BOTH sides of the scale reference. e.g. 1:200 must be 1mm on paper = 200mm full size, or 1 inch on paper = 200 inches full size, etc.
Secondly, only then can you convert your predetermined scale reference to whatever other unit you may want on either side, HOWEVER you MUST physically note the specified unit of measure you decide to use on each side of the scale reference for record purposes, AND you MUST apply your conversions to maintain the numeric equivalence of the original measurements you specified to be used in the scale reference at the beginning. Whether you choose metres, inches, feet, yards, miles, kilometres, millimetres, they must always be the equivalent of the originally specified 1 inch on the left side and the 200 inches on the right side for example.
e.g. 1 inch = 200 inches, therefore 1 inch = MUST equal 16.6666 feet (200 inches / 12 inches in a foot), which equals 5.0798331 metres, etc.
Thirdly, if you want to reduce or increase the left side to be a particular increment on paper (to suit a particular measuring instrument specified standard scale) then what you do to one side must be done to the other, e.g. 1/4 inch (1 inch divided by 4) = MUST equal 50 inches (200 inches divided by 4).
The conundrum and consequence of various scales specified out there in the world (particularly when converting from metric scales) is that they may not always reduce down to exactly fit the standardized scales of various manufactured standard imperial drawing instruments. The drawing instruments are designed to draw something by using a standard scale at the beginning of the plan drawing process to draw a plan from scratch, or, to determine full size distances from a plan that was already drawn to that standard scale in the first place.
One of a number of ways to deal with problems in this regard, using manual methods by scale rules and dividers, is to draw a custom scalebar to the standard scale you want to use on the plan you are referring to.
And or you could use a spreadsheet to convert your chosen measuring unit for taking measurements off the plan to what you want to measure up for your scratch build.
Firstly, if the scale given does not specify a unit of measure you can choose whatever unit of measure you desire: metric or imperial, but it MUST initially apply to BOTH sides of the scale reference. e.g. 1:200 must be 1mm on paper = 200mm full size, or 1 inch on paper = 200 inches full size, etc.
Secondly, only then can you convert your predetermined scale reference to whatever other unit you may want on either side, HOWEVER you MUST physically note the specified unit of measure you decide to use on each side of the scale reference for record purposes, AND you MUST apply your conversions to maintain the numeric equivalence of the original measurements you specified to be used in the scale reference at the beginning. Whether you choose metres, inches, feet, yards, miles, kilometres, millimetres, they must always be the equivalent of the originally specified 1 inch on the left side and the 200 inches on the right side for example.
e.g. 1 inch = 200 inches, therefore 1 inch = MUST equal 16.6666 feet (200 inches / 12 inches in a foot), which equals 5.0798331 metres, etc.
Thirdly, if you want to reduce or increase the left side to be a particular increment on paper (to suit a particular measuring instrument specified standard scale) then what you do to one side must be done to the other, e.g. 1/4 inch (1 inch divided by 4) = MUST equal 50 inches (200 inches divided by 4).
The conundrum and consequence of various scales specified out there in the world (particularly when converting from metric scales) is that they may not always reduce down to exactly fit the standardized scales of various manufactured standard imperial drawing instruments. The drawing instruments are designed to draw something by using a standard scale at the beginning of the plan drawing process to draw a plan from scratch, or, to determine full size distances from a plan that was already drawn to that standard scale in the first place.
One of a number of ways to deal with problems in this regard, using manual methods by scale rules and dividers, is to draw a custom scalebar to the standard scale you want to use on the plan you are referring to.
And or you could use a spreadsheet to convert your chosen measuring unit for taking measurements off the plan to what you want to measure up for your scratch build.
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