Formula For scaling 3/4" 0-4-0 to 1" scale

[rdgtrainman]

Hi Everyone! I just got the 0-4-0 Book on Friday and I read it all weekend. I was wondering what the formula is to scale Kozo's drawings from 3/4" scale to 1" scale. I can't wait to start building this project, but I don't have any machinery. I am looking on Ebay, but I can't find anything that is close to me. Thanks for your help.

Steve L.

[Bill Holland]

What I have been doing is taking the measurements in the book and multiplying by 1.351351351. Double check to make sure, I have it written down somewhere, I Think thats what I have it written down as.

[DavidT]

Any part of a 3/4" to the foot SCALE model can be measured in either metic or inches and that number is divided by .75 will give you the sixe of that part for 1" to the foot scale. A dimensioned plan like Kozo's book could be upscaled this way. You could also multiply by 1.333 for the same results. HOWEVER this does NOT apply to track gauge. Or parts that will control wheel spacing to fit your selcted gauge. Prototype gauge is 4' 8.5". This SCALES to 3.53" at 3/4" scale, 4.708" at 1" scale and 7.062' at 1 1/2" scale. At 1.6 scale you have 7.53", almost 7 1/2 inches. For 3/4 to 1 scale, I would take the 3/4 scale axle lenght and multiply by the 1.333. Do this at the point that controls the wheel back to back dimension. Compare the results to what your GAUGE requires. Add the difference to make the axle fit your gauge. On the A3, I would also refigure the frame spacing. The biggest variable is how far will the journal blocks extend pass the frame. You will have to make they first or an accurant drawing of what you will be making. What is the frame thickness? Measure your stock. Allow for some lateral movment, 10-15thou. Four wheeler do not need much. Just working from Kozo's book will be too much lateral space. His frame spacer in the 1 1/2 section is short. The journals are the key to answer

[Bill Holland]

Yeh in otherwords, 1.351351351 ;D
Scales 3/4" to 1" track.