Comments on: TT:120 Scale Size Compared to HO, OO, N Scale https://blog.model-train-help.com/2022/12/hornby-tt120.html?utm_source=rss&utm_medium=rss&utm_campaign=hornby-tt120 Model railroads and model trains Wed, 18 Jan 2023 07:53:27 +0000 hourly 1 https://wordpress.org/?v=6.9.4 By: Mr Bruce Woods https://blog.model-train-help.com/2022/12/hornby-tt120.html#comment-61123 Wed, 18 Jan 2023 07:53:27 +0000 http://blog.model-train-help.com/?p=6624#comment-61123 In reply to ROBERT SCHWORM.

No, No, No, the other way around. TT is LARGER than N

]]> By: David Frost https://blog.model-train-help.com/2022/12/hornby-tt120.html#comment-60899 Thu, 29 Dec 2022 23:38:01 +0000 http://blog.model-train-help.com/?p=6624#comment-60899 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

]]> By: geoff https://blog.model-train-help.com/2022/12/hornby-tt120.html#comment-60898 Thu, 29 Dec 2022 22:28:41 +0000 http://blog.model-train-help.com/?p=6624#comment-60898 In reply to Nigel.

Good point!

]]> By: Nigel https://blog.model-train-help.com/2022/12/hornby-tt120.html#comment-60879 Wed, 28 Dec 2022 07:19:59 +0000 http://blog.model-train-help.com/?p=6624#comment-60879 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%

]]> By: Geoff https://blog.model-train-help.com/2022/12/hornby-tt120.html#comment-60876 Wed, 28 Dec 2022 03:32:07 +0000 http://blog.model-train-help.com/?p=6624#comment-60876 In reply to geoff.

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.”

]]> By: geoff https://blog.model-train-help.com/2022/12/hornby-tt120.html#comment-60875 Wed, 28 Dec 2022 01:31:51 +0000 http://blog.model-train-help.com/?p=6624#comment-60875 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.

]]> By: ROBERT SCHWORM https://blog.model-train-help.com/2022/12/hornby-tt120.html#comment-60871 Wed, 28 Dec 2022 00:17:49 +0000 http://blog.model-train-help.com/?p=6624#comment-60871 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.

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