How does TT as an Engineering Scale work?

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TheKnighTT
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How does TT as an Engineering Scale work?

Post by TheKnighTT »

Dear americans, it´s been a while since I used imperial measurements on a daily basis, so please explain it to me. I read that TT is an engineering scale and uses 1/10. 1/10 on what? I understand British TT in that it´s 3mm scale applying 3mm as a scale foot. So how does it work for you Americans?

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MacG
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Re: How does TT as an Engineering Scale work?

Post by MacG »

As a German, I answer: One foot is in TT-scale 1/10 of an inch.

For example, is the original 40 feet long, then the length on the model is 4 inches.
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ConducTTor
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Re: How does TT as an Engineering Scale work?

Post by ConducTTor »

MacG wrote:
Mon Feb 08, 2021 2:32 pm
is the original 40 feet long, then the length on the model is 4 inches.
They meant well :wink:

I just think of it as 1:120 and don't worry about other conversions.
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Rich1853
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Re: How does TT as an Engineering Scale work?

Post by Rich1853 »

1:120 (1 inch equals 120 inches,
120 inches equals 10 feet,
1:10) 1 inch equals 10 feet
This is the reason why I chose TT scale after my stroke 3 years ago being a just retired Aerospace Quality Engineer and Metrologist. I could visually see the dimensions of the prototype. I needed a hobby.
Last edited by Rich1853 on Wed Feb 10, 2021 8:34 pm, edited 1 time in total.
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TinGoat
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Re: How does TT as an Engineering Scale work?

Post by TinGoat »

If you are more comfortable working in metric, it's also 2.5mm = 1 foot.
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Re: How does TT as an Engineering Scale work?

Post by ConducTTor »

It's interesting how differently everyone interprets things. The methods for thinking about the scale (which obviously work for you) are very confusing to me. I convert lengths to metric first and then do the 1:120 scale.
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RodTT
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Re: How does TT as an Engineering Scale work?

Post by RodTT »

What is an engineering scale exactly? Is it just one that's widely used by engineers?

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TheKnighTT
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Re: How does TT as an Engineering Scale work?

Post by TheKnighTT »

Thank you all for your answers, especially Tingoat for being true Canadian and showing how to use both. If I had just waited another day, my question would had been answered by the H.P.Products-catalogue. And for using metric I bought the Auhagen ruler, showing both true centimeters and scale meters.
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areibel
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Re: How does TT as an Engineering Scale work?

Post by areibel »

1/10 inch to the foot was a common architectural scale back when TT was getting started, and 1:120 worked out well as the scale size for the smallest practical DC motors available back then. And since the metric system was mostly a scientific tool back then (around 75 years ago!) the 1/10 of an inch worked!

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Marquette
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Re: How does TT as an Engineering Scale work?

Post by Marquette »

I guess I really am Canadian... when I'm drawing for stuff to build I use both, depending on what units the drawing I'm working from uses. If I'm not working from a drawing though, I default to imperial (most trades in Canada still use almost exclusively imperial units)
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