phat trev Posted August 12, 2019 Share Posted August 12, 2019 I have got a plan drawing of a Nieuport 12 which reads Scale 3/4” = 1’ -0” Can anyone assist in what I should do to photocopy the image down to 1/72nd please? Is there a mathematical way of doing this conversion? Cheers PT Link to comment Share on other sites More sharing options...
uncletommy Posted August 12, 2019 Share Posted August 12, 2019 (edited) The method of calculating this is used in drafting and CAD and involves what's called the scale factor. It's actually pretty simple. Here's how it works; The scale you're converting from is 3/4" = 1' 0". Take the 3/4 scale and reverse it to get 4/3. Now multiply that result by 12. That gives you a scale factor of 16. Now do the same thing for 1/72. But keep in mind, 1/72 is in inches and of course there's 12 inches in a foot so you need to make the scale factor calculation be (72/12) * 12. That gives you 72. The drawing must get smaller so we divide the larger scale factor into the smaller one. 16/72 is 0.2222. Multiply that by 100 to get a percentage. So, your copying scale percentage would be 22.2222%. It sounds more complicated than it really is. Hope this helps! Edited August 12, 2019 by uncletommy Link to comment Share on other sites More sharing options...
phat trev Posted August 12, 2019 Author Share Posted August 12, 2019 Thanks, this is helpful Link to comment Share on other sites More sharing options...
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