Interpret the measurements on a drawing

[linda85]

Hello!

I have a drawing and need to know the measurements of some walls that are not indicated on the drawing.
When I measure the scale with the ruler, it shows that 10m on the scale is 3cm on the ruler.

When I then measure with the ruler on the drawing, one wall measures 3cm, does this mean that one outer wall is 30 meters?

Hope you understand what/how I mean.

Best regards,
Linda

 

[Centano]

It should be 10 meters.

Picture of the drawing?

 

[BirgitS]

I might misunderstand you but I got the impression that you measure something to 3 cm on the drawing and in the previous sentence you wrote that 3 cm on the ruler corresponds to 10 m in reality.

 

[C.Lundin]

If what you're saying is true, then the wall is obviously 10 meters.

Edit: Seems I was a little late to the game.

 

[justusandersson]

It is an odd scale when 10 meters on the scale ruler becomes 3 cm on the ruler (i.e., 1:333). If the scale had been 1:300, 10 meters should have become 3.3 cm. Is it an American drawing with an inch scale? The natural thing is to use the scale ruler when measuring on the drawing.

 

[C.Lundin]

It's an odd scale when 10 meters on the scale ruler becomes 3 cm on the ruler (i.e., 1:333). If the scale had been 1:300, 10 meters should have been 3.3 cm. Is it an American drawing with an inch scale? It's natural to use the scale ruler when measuring the drawing.

Could it have to do with it being printed in the wrong format? Now, of course, I don't know if that's the case here, but it would explain what you're describing.

But if it's an older drawing, I guess specific formats might not appear.

 

[NoOne2k]

Above all, Adobe's PDF tends to be scaled down a few percent from the actual size when printing.

 

[linda85]

Hi,

It's probably me thinking completely wrong... I'm attaching a picture of the drawing, it's the page with an "A" that I need help with.
I have printed the drawing, so there might be some errors because of that.

I have a scale ruler but don't really understand how I should use it.

Best regards,

 

[justusandersson]

If you print the drawing at 200%, it will be quite accurate, i.e., it will match the 1:100 scale. The house's length measurement is 10.6 m and the lower measurement of the set-in is 2.3 m.

 

[linda85]

It is an unusual scale when 10 meters on the scale rule becomes 3 cm on the ruler (i.e. 1:333). If the scale had been 1:300, 10 meters should have been 3.3 cm. Is it an American drawing with an inch scale? It's natural to use the scale rule when measuring on the drawing.

If you print the drawing at 200%, it becomes quite accurate, i.e., it matches the 1:100 scale. The house's length is 10.6 m and the lower measurement of the indentation is 2.3 m.

Is there no way to get the measurement without printing it? How did you obtain the measurements 10.6 and 2.3? I really don't understand, I have a scale ruler with different scales on it, but I don't understand how I can use it and if it can be used on the computer screen since it's easy to accidentally enlarge the image and then the measurements are completely wrong...

Take care!

 

[justusandersson]

Measuring on the screen is not a good idea. Screen resolutions vary greatly. You need to print to be able to measure. Then you need a program that allows for scale changes when printing. I printed on a Mac with a program called Preview, which is available on all newer Macs. When I printed at 200%, the scale was correct. Then it was just a matter of measuring with the scale ruler.

Before you use the scale ruler, you must know the drawing's scale and ensure it is correctly printed.

 

[linda85]

Hi!
Alright, then I'll try to get hold of a printer tomorrow and print. I also have a Mac and that program

Thanks for the tips/help
Have a good Saturday evening

 

[fgo]

I've used Bluebeam a few times when I need to measure and make notes on PDFs. There is some trial version on their website.

 

[Jensa86]

But the resolution on the screen doesn't really matter at all as long as you have the scale on the same screen as the drawing? Assuming your screen isn't a parallelogram then...

 

[noupe]

You don’t need any special scale ruler to measure either. It certainly makes it easier, but it sounds like you’re only measuring a few things.

The relationship with the scale is simple. If the scale on the drawing (on screen, printed, or anywhere) measures up to 7 units (cm, mm, inches, whatever you want), you just relate it to the length of what you want to measure on the drawing in the same unit and then multiply it by the actual scale length (e.g., 10 meters).