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Common Engineering Scales.

Common Engineering Scales.K0uE&ldON
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Most CAD systems allow the user to draw at whatever scale he or she feels like. However, if fabrication shops are going to be using your drawings you will help them more by drawing views to commonly accepted engineering and architectural scales.
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y[1p(g H#K0h6B%_ Many shops like to keep drawings to a consistent scale so fabricators get used to knowing how drawings are laid out. This is just as important in plant layout and architectural drawings where 1/8"=1'-0" and 1/4"=1'-0" are standards for construction and building permit work. In machine design 3"=1'-0" and 1-1/2"=1'-0" are very commonly used.L:HGZXj/o

v Sll%f^ G7U/p Drawing to scale is important since the CAD system can make scale templates more accurately than ever before. Drawings can be plotted at full scale and parts can be checked against them simply by placing them on the drawing. Paper plots can be glued to wooden forms and templates can be sawn to shape with minimal layout time.
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The following table shows typical engineering scales and useful data to help set up your sheet layout.

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s~)q'^d7H/y$m J RATIO        SCALE        DECIMAL        RECIPROCAL
$o/V4s8y#w4z 1:1        FULL        1        1xFOIZ9I8\%K_
1:2        6"=1'-0"        0.5        2x5jft Bi
1:4        3"=1'-0"        0.25        4x
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zg"L 1:8        1-1/2"=1'-0"        0.125        8x
-}O%dZFM#Xd!s 1:16        3/4"=1'-0"        0.0625        16x
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j%} 1:24        1/2"=1'-0"        0.0417        24x&` L4GN#[;\9uw
1:32        3/8"=1'-0"        0.03125        32x)LvVnl E0}
1:48        1/4"=1'-0"        0.0208        48x
-s,@,c+J#_+qt 1:64        3/16"=1'-0"        0.0156        64x
\wn!t"pr}#x#C2]!X 1:96        1/8"=1'-0"        0.0104        96x,k0N
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1:128        3/32"=1'-0"        0.0078        128x2^*Pd5\8KV\
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You can use this chart in many different ways. Most often you would be starting off with an autocad file that was drawn full size in model space and now needs to have a drawing border to a specific drawing scale placed around it.