Scale Bias

Scale Bias

Postby TinGoat » Tue Sep 14, 2010 7:38 pm

Hi Gang,

I was surfing around the web and I found this Card Stock model for a 40-foot ISO container:
http://news.bbc.co.uk/2/shared/bsp/hi/pdfs/16_09_08_bbc_box_d_hathaway.pdf

The thing that got my attention is in the lower left corner:

The model is approx 1:68 scale.
Use the table below to reduce
the model to other scales
Scale Reduction
OO (1:76)=89%
HO (1:87) = 78%
1:100 = 68%
N (UK 1:148) = 46%
N (EU 1:160) = 43%
Z (1:220)= 31%
1:200 = 34%
1:250 = 27%


What? No TT Scale conversion?!

I've seen the same thing in magazines that show the percent to increase or shrink drawings from one scale to another but they never include TT.

Is there a table for converting drawings from other scales to TT?
Happy Railroadin'
The Tin Goat
Ron Wm. Hurlbut
Overlooking Fairbank on the Toronto Belt Line
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Re: Scale Bias

Postby ConducTTor » Tue Sep 14, 2010 8:01 pm

Off top of my head, HO * 0.725 = TT.

And by the way, there's only one scale. No bias here.
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Re: Scale Bias

Postby TinGoat » Wed Sep 15, 2010 8:54 am

ConducTTor wrote:Off top of my head, HO * 0.725 = TT.

And by the way, there's only one scale. No bias here.


Yes, 72.5% of 1:87...

The bias is theirs for omitting TT Scale from their chart.

Their loss too....

From the Paper Modelers Forum:
Ummm???? Just divide the scale you want into the scale it is currently at. For the percentage you multiply that number by 100.

Ex. 1/48 scale is the current model size ... you want 1/25 scale. You divide 48/25=1.92 or 192% Enlargement.

Ex. 1/33 scale is the current model size ... you want 1/72 scale. You divide 33/72=0.458333~ or 45.8333% Reduction.

The key is to NOT round down. Keep decimals.

I use this method in Autocad on a daily basis.

A/B=C*100=PrintSize% <= For Equation Fanatics
Happy Railroadin'
The Tin Goat
Ron Wm. Hurlbut
Overlooking Fairbank on the Toronto Belt Line
Ontario, Dominion of Canada
====
The Ontario Narrow Gauge Show:
http://www.narrowgaugeontario.com
====
Humber Valley & Simcoe Railway Blog:
http://humbervalleysimcoerailway.blogspot.com/
====
"Do you mind being apathetic?"
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Re: Scale Bias

Postby TinGoat » Wed Sep 15, 2010 11:22 am

So, this cardstock container is 1:68 divided by 1:120 times 100 = 56.666666666666 %

The devil you say! :twisted:

It may be all good and well not to round up or down for the sake of accuracy. However, PDF's only giver percentages in whole numbers, so it's 57%.

The same holds true for most photocopiers.

I also found a pair of conversion tables on PaperModelers.com forum:
Scale.jpg

This second chart is handy if the photocopier has a limited range.
Scale1.jpg

And there's a whole bunch of additional information on the PaperModelers.com formum:
Happy Railroadin'
The Tin Goat
Ron Wm. Hurlbut
Overlooking Fairbank on the Toronto Belt Line
Ontario, Dominion of Canada
====
The Ontario Narrow Gauge Show:
http://www.narrowgaugeontario.com
====
Humber Valley & Simcoe Railway Blog:
http://humbervalleysimcoerailway.blogspot.com/
====
"Do you mind being apathetic?"
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Re: Scale Bias

Postby ConducTTor » Wed Sep 15, 2010 11:36 am

Useful - thx dude.
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