# Thread: Scaling problem

1. ## Scaling problem

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Hello!

I was learning autocad, and I tried to create a PDF file.
Everything drawn was in annotation scale of 1:1 and my units were selected as milimeters.

When I opened viewport and selected 1:1 scaling , it zoomed in really much, and it looks like the scaling of 1:1000 in the viewport is the correct one, to have them 1:1 as in drawing and on paper.

Why is this happening ? Why isnt 1:1 working as it should?

2. Drawing5.dwg

Here is the DWG file if that helps in any way

3. Your drawing is setup to use meters as the base unit type "-dwgunits" at the command line and follow the prompts (the first one shows you that the units are set as meters)

4. There are differences in the UNITS command, and the -DWGUNITS command. NOTE the leading hyphen. UNITS only changes the unit of measurement used in things such as the command DISTANCE and how you input measurements, for instance to draw a line of a known length. It does NOT change your basic drawing units.

The command -DWGUNITS is capable of changing the basic units used in your drawing. It can even change a metric drawing to an imperial measurement drawing, and back again, complete with re-scaling the entire drawing to fit the new unit of measurement.

5. Originally Posted by Dana W
There are differences in the UNITS command, and the -DWGUNITS command. NOTE the leading hyphen. UNITS only changes the unit of measurement used in things such as the command DISTANCE and how you input measurements, for instance to draw a line of a known length. It does NOT change your basic drawing units.

The command -DWGUNITS is capable of changing the basic units used in your drawing. It can even change a metric drawing to an imperial measurement drawing, and back again, complete with re-scaling the entire drawing to fit the new unit of measurement.
Thanks! Will try it out.

So if I have units as mm, draw a line of 150. Measure it with dist and it shows 150. 150 as mm or m? did I draw a line of 150m or mm? To my understanding it is 150meters if the dwgunits ar meters, but reads 150mm ? A bit confused

6. Just re-read it all. So.. if units determine input values.. its 150mm. But then if everything has been input with mm, why does it read meters at the end? Or is it just scaling that is actually 1:1000. Which means 1unit(in this case metee):1000 mm

7. Originally Posted by rihiz
..... But then if everything has been input with mm, why does it read meters at the end?.....
What reads meters at the end?

When it comes to plotting (printing) AutoCAD only plots in inches and mm. You have to be aware of this when you set up the viewport scaling to accommodate your chosen drawing units.

8. If you draw a line at 150, it is 150 units, not millimeters not meters or inches just plain units, Autocad is unitless. The settings of the "-dwgunits" command tell Autocad what units you wish to work with.

9. Here is you M mm dwg layout set up for an A4 sheet, note the Viewports toolbar and in particular look at the value I have typed in which is 1 this means scale at 1:1000 automatically. Your layout was way to small, note the real size of the outer box, this is actual sheet size but you must be inside this paper size so I used an offset of 10 to make the inner MVIEW, clicked inside looked at the number in the Viewport toobar and it was 0.98543 so I typed 1 to make it an exact scale, could have type 2 or 0.5 again an exact metric scale.

Because its an A4 sheet I plot at a 1:1 scale as the mview has done the scaling for me. Lastly like the others reset your units if working in mm then layout would be the same but again for 150 circle a 1:1 mview scale.

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Thanks for all the replies.

So in the end scale of 1:1000 is actually 1:1 , just its telling me that 1 meter = 1000mm.

And I can change the unit by , dwgunits

But with command units , I just change how some commands will read , for example dist to measure the length of a line.

Correct?

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