scale

[larry ray]

How do you figure scale I would like to know how much is 8 inches 1:1 in 1.25 scale.  Thanks

[Dave G.]

12 minutes ago, larry ray said:

How do you figure scale I would like to know how much is 8 inches 1:1 in 1.25 scale.  Thanks

You mean 1/25 scale. 1/25 of 8" is .32". Just punch 1/25 of any number of inches into Google and get an instant answer. 1/25 of 12" is .48" or a tad shy of 1/2".

[DPNM]

8 (your measurement)  divided by 25 (your scale) = 0.32 inch. The exact fraction is 8/25

To get a close and understandable from a ruler viewpoint fraction 0.32 is a bit less than a third of an inch. My thought is 5/16 should be close.

[larry ray]

Thanks fellows.

Larry

[OldNYJim]

If you can get used to using metric too, it’s super easy - 1 inch in scale is (give or take) 1mm.  

[peteski]

Why go to Google when you can do this using any basic 4-function calculator?  Or just do it longhand (of you still remember how). This is 1st grade math.

Just take the 1:1 dimension (in inches), divide it by 25 (or whatever scale you need to use), and you get the scale dimension (still in 1:1 inches, which you do need to fabricate the part).  I have couple of those tiny cheap calculators (keychains) from Staples (or Dollar Store) hanging around my workbench, just for this purpose.

8" / 25 = 0.32"  I also own a $20 digital calipers from Harbor Freight, so I can dial 0.320" directly on the calipers to measure out the part I'm making.  Those are couple of (very inexpensive) tools I find indispensable in this hobby.

[Dragonhawk1066]

There's also a scale conversion chart on jbwid.com. https://jbwid.com/scalcalc.htm

[Jantrix]

On 12/8/2019 at 2:13 PM, CabDriver said:

If you can get used to using metric too, it’s super easy - 1 inch in scale is (give or take) 1mm.  

This is what I use. I do all my model math in millimeters.

[LL3 Model Worx]

 

I find the digital 

On 12/8/2019 at 10:23 PM, peteski said:

Why go to Google when you can do this using any basic 4-function calculator?  Or just do it longhand (of you still remember how). This is 1st grade math.

Just take the 1:1 dimension (in inches), divide it by 25 (or whatever scale you need to use), and you get the scale dimension (still in 1:1 inches, which you do need to fabricate the part).  I have couple of those tiny cheap calculators (keychains) from Staples (or Dollar Store) hanging around my workbench, just for this purpose.

8" / 25 = 0.32"  I also own a $20 digital calipers from Harbor Freight, so I can dial 0.320" directly on the calipers to measure out the part I'm making.  Those are couple of (very inexpensive) tools I find indispensable in this hobby.

The digital caliper has saved my sanity in both the hobby and my profession more times than I can count!

It is most assuredly a must have tool for ANY fabricator/mechanic etc...

[Tom Geiger]

Why do any math?  Here's a couple  1/25 scale rulers.  Put it up against your model and measure it off accurately in scale!  

Edited December 13, 2019 by Tom Geiger

[Khils]

21 minutes ago, Tom Geiger said:

1/25 scale ruler

Hi Tom

Did you ever check if you had any of those NNL rulers left....I asked you about them Saturday night in Toledo.

[Tom Geiger]

3 minutes ago, Khils said:

Hi Tom

Did you ever check if you had any of those NNL rulers left....I asked you about them Saturday night in Toledo.

I remember Kevin!  I just sent you a private message.

[OldNYJim]

That NNL East one is COOL! 

[Flat32]

If I were to try scratch building the scale I'd choose would be 25.4:1 or a simple 1mm=1".  That way a digital caliper in mm mode would simply be read as 1:1 scale inches.  A metric dial caliper would be the same only lacking the ability to switch the measurement to actual inches.

Using 25.4 as a scale might allow the scratch built model to "fit" reasonably well alongside either 1:25 or 1:24 kit models.