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HOn3 Scaling
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 Posted: Thu Jan 6th, 2011 03:52 pm
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Basher
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Visited the NMRA site. Check out NMRA standard S-1.2 Standards for Scale models

This may be the chart you seem to looking for.

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 Posted: Sat Jan 15th, 2011 06:17 pm
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tebee
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Here is a drawing for a SP 28ft 3ft Stock car if it helps.
It's dimensioned in millimeters for HO scale, Although my brain still thinks in feet and inches, I work in metric.

Note that it's a drawing of a model of this car, while most of the main measurements are correct some things will have been re-sized to fit in with the manufacturing process.



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 Posted: Sat Jan 15th, 2011 07:37 pm
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Captian JL
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The Drawing is absolutely wonderful.  Yes, this is what I was looking for.  I do not know how I missed it in the NMRA site.  But that as it may be.  I will continue with the project at hand.  Now with this drawing I will be able to build as many stock cars as i have raw material for.  (Raw Material = scale wood and wire)  Anyway many thanks for the input.  One day I will post a photo of one car that I built.  Captain JL

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 Posted: Sun Jan 16th, 2011 05:41 pm
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tebee
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You wouldn't have found it on the NMRA Site or in fact anywhere as it did not exist until about 2 hour before I posted it.

Sadly drawings of any sort seem to be hard to find online, mostly I suspect due to copyright problems, though what commercial benefit people expect to derive from them I fail to see.

I know there are some email groups who share drawings and articles within the membership but publishing them on a website may be too risky for the owner in the current climate.

I'm afraid copyright laws were not drafted with the world we have now in mind and it may be a few year before they reach an accommodation with it.

Tom



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 Posted: Fri May 27th, 2011 08:55 am
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dave1905
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My suggestion is to get a dial or digital caliper and a hand calculator. Those two tools, a #11 model knife, a pin vise and a straight edge and you can build almost any model you want from any drawings in any scale.

While the drawing is a big help it still doesn't tell you what the spacing is on the vertical posts or how wide the side slats are etc. You still have to measure those.

What I do is pick a measured dimension on the drawing (don't care about the scale of the drawing).

So lets say the door on the drawing is 5 ft wide. using the dial calipers I measure the width on the drawing. It measures .937" wide. I am bulding in HO. So in HO 5 ft is .690". I divide .690/.937 = .736 conversion factor.

Then I just measure any dimension on the drawing with the caliper, multiply it by.736 and get what the dimension would be in HO scale. The side posts are .845 apart. .845 x .736 = .622. The side posts are .622 apart in HO.

By using this method you can build from any drawing or picture fro which you have a dimension. Have a side on picture of a car you want to build but only a picture? Trucks generally have standard wheelbases. Measure the wheelbase of the truck and that's your known dimension. After that you can measure anything you want on the photo and use it to produce an accurate model. No need to know the scale or to have a "standard". This method is great for home printed or photocopied plans because not all printers or copiers have exact resolution.

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 Posted: Fri May 27th, 2011 11:37 am
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Herb Kephart
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Dave--I have used that system of re-scaling also. works going up or down. Enter the scaling factor into a calculator as a constant. and in a short time you can have all the dimensions that you need. Thanks for posting it--it should be more widely known--but I guess those that it would benefit are a dying breed.

Viva scratchbuilding!


Herb   :old dude:



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 Posted: Sat May 28th, 2011 12:36 am
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Nn3Designs
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Being an Engineer by trade one thing to use as a "standard" for determining how big, how long, how wide, etc is this.

HO = 1/87 scale
1" / 87" = 0.011494252873563218390804597701149"

OR 1" Scale Inch is 0.0115" Long.

S0 30 Foot long Stock car in real life = 30' x 12" = 360" in real life.

So to convert into SCALE would be:
360" (real life) x 0.0115" = 4.14" Long

Use that measurement on all your conversions and you will be in perfect scale every time.

Get a cheap pair of Calipers and you will be doing base design engineering in no time.



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 Posted: Sun May 29th, 2011 07:46 pm
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W C Greene
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How about simply buying an HO scale rule? Seems like all the work has been done by someone else. Or like I have, scale rules for HO through 1:32 scale...I never need to do any figuring, just measuring...if I want to measure.

                    Woodie



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 Posted: Mon May 30th, 2011 07:26 pm
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Nn3Designs
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Well since most of what I do is prototyping in Aerospace Manufacturing prior to manufacture I am used to having to build scale models to ensure actual fitment into aircraft sub-structures. I do most of my modeling using CATIA and SolidEDGE but incorporating manufacturing tolerances is difficult at best during development stage. Plus, being able to mathematically calculate scale, you can use pictures with only one real life measurement to base your conversion from. I use Calipers on the picture once I get my scale correction worked out. Kind of a big pain in the rear end and the long way about things sometimes. But when accuracy counts it is the only way to get the best results.



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 Posted: Mon May 30th, 2011 07:55 pm
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W C Greene
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OK, I understand...although I am not a stickler, I do understand scale relationships. I have been building stuff for such a short time, I have much to learn it seems. I suppose that I will go back to the shop and make something, however crude it is, and strive for that accuracy that seems to be the only way to go. Or maybe not......

Have fun and run a train today..     Woodie 



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