Large Scale Central

scaling G to HO by percentage

General Discussion
#1

I am having a brain malfunction. I know I know how to do this but can’t seem to figure it out. What percentage of 45mm is 16.5mm. I want to use Anyrail to play with some yard configurations now that I understand wyes better. However in G there are no #2 or #3 wyes which would be used with #4 and #6 turnouts. However in HO there are. So I want to scale down my available area for my yard into it corresponding HO size.

It should be as simple as taking my measurements and multiplying by a percentage. But I can’t seem to remember how to do that. I know I should be able to.

#2

Is it:

45/100=16.5X

45X=16.5 X 100

45X=1650

x=1650/45

x=36.66

therefor HO is 36.66 % the size of G (referring to track gauge not scale) so I would mulitply my dimensions by 36.66% or .3666

#3

Devon,

If you are not concerned with scale, but just want to enlarge a drawing of HO track (16.5mm gauge) to equivalent G (45mm gauge), then here is the math:

45/16.5 = 2.727272 (round it to 2.73)

Just multiply the HO track drawing by 273% or 2.73 to get the G size.

To go the other way (from G to HO), just multiply the G by the inverse to get:

1/2.73 = 0.3663 or 36.63%

Bottom line … I agree with you. Your math is probably more accurate than mine due to rounding errors on my part.

Bob

#4

Of course for use 1:29 folks we just multiply HO sizes by 3 ha ha!

You DID say “G” scale which can be interpreted to many different scales.

Greg

#5

Devon Sinsley said:

therefor HO is 36.66 % the size of G (referring to track gauge not scale) so I would mulitply my dimensions by 36.66% or .3666

I also said I was not concerned with scale but with gauge. I am using track planning software so the track is the only concern. The gauge of track for HO is 16.5 (right?) and the gauge for G is 45mm (right?) so what percentage is 16.5 of 45. This should be a ratio problem. If 45mm is 100% then what percent is 16.5mm. If I did my math correct, and I am not saying I did, then HO track should be 36.66% the size of G track. So I would then need to scale my are by 36.66% to make the HO track representative of the G track.

And honestly Bob I didn’t follow where you went at all. Edit: OK Bob I actually wanted to go the other way. I have G gauge (45mm) track plan and want to make it HO or 16.5mm. Actually what I have is a space that is in real life 150" by 54" and I want to develop a 45mm track plan for it using Anyrail but the components in Anyrail that I want to use are not available in 45mm but are available in HO or 16.5mm. So I wanted to shrink my area so that it became the same size as my 1:1 are only respective to the 16.5mm track. So I am looking to shrink it by a certain percentage

#6

Greg Elmassian said:

Of course for use 1:29 folks we just multiply HO sizes by 3 ha ha!

You DID say “G” scale which can be interpreted to many different scales.

Greg

Where did I ever say g “scale” I said G “gauge” in reference to 45mm(http://largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-wink.gif). G “scale” is a love/hate relationship there is no such thing as G “scale” effectively it is really G “gauge”

#7

G gauge still does not constrain the scale… you are still stuck my friend! (http://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-laughing.gif)

Greg

#8

Its really gauge one. And G scale is LGB rubber scale, around 1:22.5.

So if 45mm divided by 16.5mm is 2.727272

Then wouldn’t you divide your 1:1 dimensions by 2.727272?

Or multiply your 1:1 dimensions by .366666666?

#9

But I could careless in this instance about the scale. Whether its 7/8 or 1/32 the 45mm track will take up the exact same amount of real estate.

David,

I think we Bob/You/Me are all correct. And Greg is just a butthead (http://largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-wink.gif)

#10

Shoot, I thought I could get your goat… but I guess I went down in flames. (http://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-laughing.gif)

#11

why not use 16.5 divided by 1% of 45mm?

16.5/0.45=36.66%

#12

Aristocraft or should I say Lewis picked 1\29 to save cost. How you take a HO item building or train multiply by 300% and boy do you save a ton on engineering cost. If there is a building I need I by it in HO spray paint the parts flat black put on thelarge Xerox at Staples set for 300% and Bing go 1\29 scale parts diagram. Showed this to Lewis and he laughed and wondered how long it would take for some to figure him out. Got to laugh. Jack

#13

Korm Kormsen said:

why not use 16.5 divided by 1% of 45mm?

16.5/0.45=36.66%

Nice to know you came up with the same answer I did by a different method. At any rate we now now that HO is 36.66% of the size of 1 gauge, which David is correct that is the right name for 45mm

#14

jack garry said:

Aristocraft or should I say Lewis picked 1\29 to save cost. How you take a HO item building or train multiply by 300% and boy do you save a ton on engineering cost. If there is a building I need I by it in HO spray paint the parts flat black put on thelarge Xerox at Staples set for 300% and Bing go 1\29 scale parts diagram. Showed this to Lewis and he laughed and wondered how long it would take for some to figure him out. Got to laugh. Jack

That is a nifty trick I will have to remember that one

#15

The correct scale for 45 mm to be standard guage is 3/8 inch to the foot, while the standard HO scale is 1/8 inch to the foot. Therefore a close approximation would be G is 3X HO.

#16

Since the initial post was for track, just the 45mm needs to be compared to HO track. If building your own switch then using a factor of 3 times may not work as 45 mm is just 45 mm, not a scale. What you run on the 45mm track is a scale.

#17

Dan Pierce said:

Since the initial post was for track, just the 45mm needs to be compared to HO track. If building your own switch then using a factor of 3 times may not work as 45 mm is just 45 mm, not a scale. What you run on the 45mm track is a scale.

Exactly Dan,

HO Gauge IS 16.5mm gauge

G (really 1 gauge) IS 45mm

16.5 IS NOT 1/3 OF 45. We keep bringing scale into a gauge conversation. And as Greg has mentioned there is no G scale. There might have been at one time but now it is rightly called “large scale” for a reason. And as such my original question had to refer to track gauge and not a scale.

#18

And, again, the terms scale and gauge are being improperly substituted for each other. They are 2 different terms with 2 different definitions.

This is the situation I faced in other forums, and even in one of my clubs. Scale is ratio of model to prototype, and gauge is the width of the track (inside face of the rail-head to inside face of the other rail-head). In the 1:1 world there are different gauges, but all of the stuff is in the same scale, 1:1.

#19

Exactly,

I am and have always been referring to gauge. But in all I am glad others chimed in and offered some great ways to relate the various scales.