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Nigel Hyde	01/08/2010 12:30:12
45 forum posts 2 photos	Hi all I have darwings of a 3 1/2 loco and i would like to build, but in 7 1/4 . so my question is how do i scale it up? from 3.5" to 71/4" If i scale it up double the size it will only give me 7" any ideas or am i being stupid !! thanks Nigel
JasonB	01/08/2010 12:47:28
25215 forum posts 3105 photos 1 articles	Multiply the 3 1/2" sizes by 2.0714285 and then adjust to suit standard metal and thread sizes. You may also have to adjust the boiler dia to suit available tube size. Also watch out for things that will be overscale, the 2" Minnie traction engine is a good example as just doubleing up gives some rather bulky components. Jason
Paul Boscott	01/08/2010 18:37:43
99 forum posts 21 photos	Nigel Considering the many hundreds of hours and pounds you will spend to make a good job of such a project I would suggest that you invest in a proven set of correct size drawings. Paul
Nigel Hyde	02/08/2010 21:31:35
45 forum posts 2 photos	thanks Jason and Paul i am building Nick Feast Q1in 3.5" and fancied a 71/4 one !!! I have a good friend who is my clubs boiler inspector who would advise me on the boiiler But as my dad said "one project at a time, son!" but i may build a 71/4 Q1 next thanks all Nigel
Stub Mandrel	02/08/2010 22:02:57
4318 forum posts 291 photos 1 articles	Hi Nigel, Your apparently simple question has a complicated answer! If you are making a true-scale model then mulitiplying by 2.xyz is fine. Fine for things like the size of frames/cab etc. But to make a working loco in a sensible amount of time you will want things like a boiler and various working parts to be made from stock materials (they don't make copper tube in 1-thou increments!) The problem is then that thicknesses and diameters are changing by different amounts to teh separation between components Two 1/8" components become 1/4", but the distance between them becomes needs to increase by a little more to allow for the thickness not increasing enough. Essentially you have to re-draw the plans completely, or be prepared to check every dimension on the job. Neil
Nigel Hyde	02/08/2010 22:30:01
45 forum posts 2 photos	Hum i hadn't thought of that ! not as simple as i thought some serious food for thought not sure i fancy re drawing the loco!!! thanks Nigel
JasonB	03/08/2010 07:20:15
25215 forum posts 3105 photos 1 articles	You don't actually need to redraw, just write the dims over the top in a different colour . BUT you need to calculate things carefully to arrive at those sizes. Jason
KWIL	03/08/2010 09:07:06
3681 forum posts 70 photos	Nigel, Have a look at photo No 3, one of these?

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