Modelholic Posted January 8, 2020 Share Posted January 8, 2020 I'm having a bit of brain-fart trying to scale 1:400 to 1:350! I've done it before...but can't get my head around it now. Anyone know the formulas for converting the major scales (1:400, 1:350, 1:500 etc.) to each another? TIA Tom Link to comment Share on other sites More sharing options...
Bonhoff Posted January 8, 2020 Share Posted January 8, 2020 Divide 400 by 350 - this give you your scale factor of 1.143 (Rounded to 3 digits) Then multiply your dimension measured on your 1/400 plan by the scale factor.... HTH IanJ Link to comment Share on other sites More sharing options...
bootneck Posted January 8, 2020 Share Posted January 8, 2020 Hi Tom, Scaling 1:400 to 1:350 is 114.3% I'm sure other members will come along and provide formulas for these. cheers Mike Link to comment Share on other sites More sharing options...
JosephLalor Posted January 8, 2020 Share Posted January 8, 2020 (edited) What Bonhoff and Bootneck said is generally applicable E.g. 1/48 is 150% of 1/72 (72x100/48) 1/32 is 150% of 1/48 (48x100/32) 1/24 is 300% of 1/72 (72x100/24) 1/200 is 36% of 1/72 (72x100/200) 1/350 is 200% of 1/700 (700x100/350) 1/600 is 120% of 1/720 (720x100/600) Reverse the divisor and dividend to go the other way Edited January 8, 2020 by JosephLalor Link to comment Share on other sites More sharing options...
AntPhillips Posted January 8, 2020 Share Posted January 8, 2020 What the guys above have said is correct, but just to expand further: If you're enlarging an existing drawing on a copier then enlarge by 114.3% If you're taking measurements off a drawing to transfer elsewhere then multiply by 1.143 Link to comment Share on other sites More sharing options...
ArnoldAmbrose Posted January 8, 2020 Share Posted January 8, 2020 (edited) Gidday Tom, Bonhoff and Bootneck are close. The scaling from 1/400 to 1/350 is approximately 1.142857 (or 114.2857%) 🥴 We could go to more decimal places but that would just be silly. 😁 Seriously, they're spot on. So if, for example, a gun barrel in 1/400 is 25mm long in 1/350 it would be 25 x 1.143 = 28.6mm. HTH. Regards, Jeff. Edited January 18, 2020 by ArnoldAmbrose Link to comment Share on other sites More sharing options...
Modelholic Posted January 8, 2020 Author Share Posted January 8, 2020 Thank you all. you've jogged (shoved it with a bulldozer) my memory. Tom 1 Link to comment Share on other sites More sharing options...
Ray S Posted January 10, 2020 Share Posted January 10, 2020 @Modelholic, thank you for raising this issue. I had been trying for days to work out how to ask this and make it sensible! I have wanted to re-scale some ship plans and my schoolboy maths had vanished into the ether! I have written down the answers and that is safely stashed in a notebook in the work den. Cheers, Ray the numericallychallenged Link to comment Share on other sites More sharing options...
Modelholic Posted January 10, 2020 Author Share Posted January 10, 2020 (edited) Ray, Glad to have been of assistance Tom the 10 thumbed amoeba Edited January 10, 2020 by Modelholic 1 Link to comment Share on other sites More sharing options...
Chewbacca Posted January 18, 2020 Share Posted January 18, 2020 I created a simple Excel spreadsheet for the BULOLO scratchbuild I'm doing at the moment so that I could quickly take a measurement from the photos on the screen (which I'd imported into PowerPoint to fit A4 at approx 1/660 as no plans were available), type it into Excel and the output was the correct 1/350 size. You could do the same for any scale conversion Link to comment Share on other sites More sharing options...
foeth Posted January 18, 2020 Share Posted January 18, 2020 (edited) Multiply by 400. For any UK ship, see if that measurement is close to any whole X feet + Y inches measurement or depending on what you measure to known frame spacings, round to that number. Only then devide by 350. This will reduce measurement error a bit. Edited January 18, 2020 by foeth Link to comment Share on other sites More sharing options...
fightersweep Posted January 19, 2020 Share Posted January 19, 2020 (edited) Sorry to chime in, So if I wanted to upscale some 1/76 plans to 1/48, would I be looking at 118.9% increase? Steve (with but a humble grade 2 CSE in maths) Edited January 19, 2020 by fightersweep Link to comment Share on other sites More sharing options...
ArnoldAmbrose Posted January 19, 2020 Share Posted January 19, 2020 Gidday Steve, 76/48, (multiply the original plans by 76, then divide by 48) hence 158.3% increase. Regards, Jeff Link to comment Share on other sites More sharing options...
fightersweep Posted January 19, 2020 Share Posted January 19, 2020 2 hours ago, ArnoldAmbrose said: Gidday Steve, 76/48, (multiply the original plans by 76, then divide by 48) hence 158.3% increase. Regards, Jeff Thanks Jeff! I don't know how I arrived at 118.9% then! 😄 1 Link to comment Share on other sites More sharing options...
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