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[TheLongBuild]

If a project is 137.76 by 37.404 by 19.68 inches.  And I wanted to scale it to 1/4 size is it just a case of dividing the figure by 4 ? so 34.44 , 9.351 , 4.92 inches ?. 


Larry

[DaveM]

Larry
Yes.....but why are you asking? Unlike politics, some things are still quite logical!
DaveM

[Taranis]

Yes Dianne would not understand the question 

[TheLongBuild]

Larry
Yes.....but why are you asking? Unlike politics, some things are still quite logical!
DaveM

The project I am looking at when I scaled it down it just looked an odd size compared to the original so was just wondering if there was some fancy mathematics I missed. Might not bother with actual scale but go with what looks right !! to me if it ever gets out of the in my head design office.

[malcolmfrary]

The project I am looking at when I scaled it down it just looked an odd size compared to the original so was just wondering if there was some fancy mathematics I missed. Might not bother with actual scale but go with what looks right !! to me if it ever gets out of the in my head design office.

137.76 by 37.404 by 19.68 inches seems an odd selection of sizes to start with, so it s perfectly reasonable that the answer will be a set of odd sizes.
If it does look right after not bothering with scale, it will be found to have actually scaled.

[tigertiger]

The new sizes may seem, not right, but when finished a viewed in its 3D glory, it will look right.

[roycv]

Excuse me but have I misunderstood?

If I want a cubic thing (3 dimensions) to be a quarter of its size then dividing the side measurements by 4 will not achieve it.  If you halve each dimension it will be  be 1 /8th. its' size.  If you divide by 4 then it will be 1 /64th. its size.
Approximately  if you take each linear measurement and multiply by 0.63 or take 63 % of each measurement you will come up with something a fraction larger than a quarter of the original size.

e.g.  A cube with sides of 4 inches equals 64 cubic inches.  A quarter of this size is 16 cubic inches.
 
63% X 4 inches is 2.52 inches and this number cubed will come to 16.008 cubic inches.

regards Roy

[TheLongBuild]

Excuse me but have I misunderstood?

If I want a cubic thing (3 dimensions) to be a quarter of its size then dividing the side measurements by 4 will not achieve it.  If you halve each dimension it will be  be 1 /8th. its' size.  If you divide by 4 then it will be 1 /64th. its size.
Approximately  if you take each linear measurement and multiply by 0.63 or take 63 % of each measurement you will come up with something a fraction larger than a quarter of the original size.

e.g.  A cube with sides of 4 inches equals 64 cubic inches.  A quarter of this size is 16 cubic inches.
 
63% X 4 inches is 2.52 inches and this number cubed will come to 16.008 cubic inches.

regards Roy

Lost me when you mentioned Cubic 

[roycv]

HI longbuild ever wondered what floats your boat?  A cube has volume and needs 3 measurements to work out its size.  That's the bit under your boat when floating.
A cube is called a cube because the 3 sides are the same length. 
Do you know what a square is?  This is an area with the sides of equal length.  But a square is flat. 
If you cut out a square from paper and made 6 of them you could sellotape them together and make what looks like a child's toy brick. 

And now you have a cube.
 
Roy

[TheLongBuild]

HI longbuild ever wondered what floats your boat? 
 
Roy

Luck in most cases 

[Netleyned]

Windy hammers get rid of Scale

[ChrisF]

Excuse me but have I misunderstood?

If I want a cubic thing (3 dimensions) to be a quarter of its size then dividing the side measurements by 4 will not achieve it.  If you halve each dimension it will be  be 1 /8th. its' size.  If you divide by 4 then it will be 1 /64th. its size.
Approximately  if you take each linear measurement and multiply by 0.63 or take 63 % of each measurement you will come up with something a fraction larger than a quarter of the original size.

e.g.  A cube with sides of 4 inches equals 64 cubic inches.  A quarter of this size is 16 cubic inches.
 
63% X 4 inches is 2.52 inches and this number cubed will come to 16.008 cubic inches.

regards Roy

Yes, I think you have! 

[DaveM]

In modelling terms the 'scale' conventionally refers to linear measurements. For example, a 1/12 scale model of a 36 ft boat would be 36" long.
DaveM

[Buccaneer]

Well done Dave. That has squared off the circle on that one. Next week.....Calculus.
John

[roycv]

Dave, he did not say scale, he said size. See original post, which I also realise was entitled scale?

I do understand that 1/4 scale is as you said but perhaps he can clarify what was meant?

If I was specifying the size of a fuel tank on a car which was say 10 gallons and said I want one half that size, most people would expect it to contain 5 gallons.

Roy

[TheLongBuild]

Replace Size with Scale. Although to me it is the same thing

If a project is 137.76 by 37.404 by 19.68 inches.  And I wanted to scale it to 1/4 size  ( Scale) is it just a case of dividing the figure by 4 ? so 34.44 , 9.351 , 4.92 inches ?. 

However as I have already mentioned when I have made a quick mock up of it I think it looks daft so will build it so it look right, the original with the sizes I mention looks absolutely fine, its just when I have scaled it down it looks odd, possibly because of the length against the small width, oddly depth looks fine !!

[malcolmfrary]

Replace Size with Scale. Although to me it is the same thing

If a project is 137.76 by 37.404 by 19.68 inches.  And I wanted to scale it to 1/4 size  ( Scale) is it just a case of dividing the figure by 4 ? so 34.44 , 9.351 , 4.92 inches ?. 

However as I have already mentioned when I have made a quick mock up of it I think it looks daft so will build it so it look right, the original with the sizes I mention looks absolutely fine, its just when I have scaled it down it looks odd, possibly because of the length against the small width, oddly depth looks fine !!

When I get that problem I usually find it best to use just the one side of the ruler, either inches or centimetres for both the measuring and marking stage.

[grendel]

My take is - if it looks wrong, it probably is, check the original dimensions are correct before scaling.
I am currently assisting a colleague with scaling issues on a fairground model, and things werent working, when I asked the scale he told me 1/16, yet the diameter of the rides track was such that it didnt match the rise and fallof the track, after carefully checking against the original plan dimensions it would appear that an arbitory scale for the horizontal was different to the scaling set for the vertical the horizontals are nearer 1/24, whilst the verticals are close to 1/17, talk about a confusion of scales
to me scaling means the conversion of one linear measurement by a fraction to another linear measurement, volume is a totally different issue.

[TheLongBuild]

Hi
Thanks, but Sizes are correct, or are at least are on the website., but will enquire.
But when I look at the picture the actual sizes stack up.