DFTG 1309
Instructor I. Zhebrak
Class 19
LECTURE:
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MV, Layout space
Drawing scale and text height. Calculating drawing scale
Annotative text
GRADED EXERCISES:
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“Exercise23”. It is located under class 19 folder in teacher’s learning webpage.
Save as YourName_23
CALCULATING A SCALE FACTOR
Below are two standard scale tables for Engineering and Architectural drawings.
A. To obtain the scale factor of an Engineering drawing scale:
1. Multiply the feet of the desired scale by 12.
2. For example 1″=50′ scale would be 50×12 = Scale Factor 600.
Engineering ScaleDECIMAL UNITS
Drawing Scale
Scale Factor
1″ = 10′
120
1″ = 20′
240
1″ = 30′
360
1″ = 40′
480
1″ = 50′
600
1″= 60′
720
1″ = 70′
840
1″ = 80′
960
1″ = 90′
1080
1″ = 100′
1200
1″ = 200′
2400
1″ = 300′
3600
1″ = 500′
4800
1″ = 1000′
9600
Viewport Scale
1/120xp
1/240xp
1/360xp
1/480xp
1/600xp
1/720xp
1/840xp
1/960xp
1/1080xp
1/1200xp
1/2400xp
1/3600xp
1/4800xp
1/9600xp
When you type the size of the text for CIVIL drawing text style from the chart given below use “.6” instead “6” etc
To obtain the scale factor of an Architectural drawing scale:
1. Multiply the denominator of the desired scale by 12.
2. For example 1/4 scale would be 4×12 = Scale Factor 48.
Architectural Scale
Drawing Scale
Scale Factor
1/128″ = 1′-0″
1/64″ = 1′-0″
1/32″ = 1′-0″
1/16″ = 1′-0″
3/32″ = 1′-0″
1/8″ = 1′-0″
3/16″ = 1′-0″
1/4″ = 1′-0″
3/8″ = 1′-0″
1/2″ = 1′-0″
3/4″ = 1′-0″
1″ = 1′-0″
1 1/2″ = 1′-0″
3″ = 1′-0″
6″=1′-0″
1′-0=1′-0″
1536
768
384
192
128
96
64
48
32
24
16
12
8
4
2
1
Viewport Scale (type z,
enter, 1/#xp)
1/1536xp
1/768xp
1/384xp
1/192xp
1/128xp
1/96xp
1/64xp
1/48xp
1/32xp
1/24xp
1/16xp
1/12xp
1/8xp
1/4xp
1/2xp
1xp