Reply With QuoteAn underlined dimension means that it is not to scale...
Older engineering drawing symbols
Can anyone help me identify the highlighted symbol? Have had no luck trying to interpret its meaning. Please... enlighten me with your wisdom.
An underlined dimension means that it is not to scale...
Tell me and I forget. Teach me and I remember. Involve me and I learn.
Thank you! Is this tribal knowledge or is it noted in a particular spec? I couldn't find any references.Originally Posted by Kelly Bramble
Most recent Y14.5-2009 and every other dimensioning and tolerancing standard since about ... 1947.
Tell me and I forget. Teach me and I remember. Involve me and I learn.
I think 127cfc was particularly wondering WHY there would be an underlined, i.e., out-of-scale dimension on a drawing.
The answer is, back in the days of paper, pencil & drafting boards (where I cut my teeth), if a dimension changed only slightly, you did NOT go to the effort of redrafting (manually!) the whole view. You erased the wrong dimension & put in the corrected one, underlined to show that it is out-of-scale. And that concludes this tour of Engineering History...
Well written Jeff.
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