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TT:120 Scale Size Compared to HO, OO, N Scale
John writes:
“Hornby have recently introduced a new range of model trains in the UK. HO Gauge track is 16.5mm, N Gauge track is 9mm and TT:120 track is 12.0mm. It is an exact true scale. What ratio would I have to set my printer up to so as to print regular OO scale or N scale drawings off to suit TT:120 gauge? Thanks”
SUBMIT YOUR QUESTION
TT is 120
N is 160
So therefore- TT is .75 that of N.
Thefore to scale down from N to TT, and you have your printer now set to be full scale of N, you need to set the size parameter of the printer to 75% of full scale to shrink the drawing down to TT.
No, No, No, the other way around. TT is LARGER than N
No, that’s not correct. TT is bigger than N, so you want to increase N to get TT !
I found this scale converter on line. http://www.scalemodelersworld.com/online-scale-converter-tool.html#aEnlargeBy
from N (1/160) to TT (1/120) increase, set your printer to 1.3333
from OO (1/76) to TT (1/120) decrease, set your printer to 0.6333
from HO (1/87) to TT (1/120) decrease, set your printer to 0.725
I once tried to enlarge some polar plotting charts I was using for celestial navigation practice, and the circles were turned into ovals because the copier was scaling properly. I don’t know how to address that with a printer. Maybe it’s not an issue. But it would be worth doing a trial run on cheap paper before printing onto expensive card. It’s also quite likely that the various online stores that sell downloadable printable kits will have some instructions on to rescale. And I think I read some time ago on one site that the way to do it was to rescale in the software, ie adobe, and then print.
that should read “I once tried to enlarge some polar plotting charts I was using for celestial navigation practice, and the circles were turned into ovals because the copier was NOT scaling properly.”
As a further addendum to previous replies, British N scale is 1:148, not 1:160 which is the continental scale, so to reproduce British N scale drawings in TT120, you’d need to scale by 123.33%
Good point!
Hi John, while working with my 3D printer and whating to change models from oo to n gauge I found this PDF
It doesn’t covert to the TT but it does give a formula you may be able to use. Hope this helps
Understanding and converting scale ratios – FineScale Modeler
https://finescale.com › files › pdf › tips_for_scales
PDF