AutoCAD - Printing Isometric

[Jeanettebrooks84]

Hello.

I have a problem, when I do a drawing as a Isometric and then printing it out I don't get the same measures.

I have drawn a house room. Its L 2900 mm  x W 3250 mm x H 2500. and in my drawing it all its right.

I set up my printer to print out the scale I want. here it is 1:20

But, when I get my drawing out on paper it is L2340 x W2680 x H 2020

I do I get the right measures out on paper??

Regards J.

[ The subject line of this post has been edited for clarity by @handjonathan Original: Printing Isometric ]

[Michiel.Valcke]

How did you set your scale? 

Are you sure your point of view that you are printing is equal to the top view of your drawing. The scaling difference is not proportional across the different dimensions. Which means this is not caused by the scale that you set to print. It is more likely that your view is askew, explaining why the Height difference is not proportional to the Width difference. 

Use the viewcube or the command PLAN to set your view back to the top view. I expect you'll have better results.

[Jeanettebrooks84]

Hi

Thank you for trying to help me out. I'm not sure what the PLAN command can do to help me out...

It show me that I have 2900 x 3250, but not when I print.

I have add the dwg file. I know I'm not the best to use AutoCAD. So no laughing.

Have also add a screen shot of my print sittings... Hope you can help 🙂

[Michiel.Valcke]

Hello,

Everyone has to learn, what we don't know, we don't know yet.

You are printing directly from your model space. The scale you are setting in that dialog screen should (for all intents and purposes) always be set to 1=1. That scale represents the scale that will be applied to your printer setup (the rest of the dialog screen) it has no relation to the scale you will be using to represent your model.

The best way is to make a layout. The layout itself is a representation of the page that will be printed (pdf or paper or other). It corresponds to a specific paper size (in mm or inch).

On the layout you can place a viewport, which is like a camera looking at your model space. The scale with which you want to represent your model on the layout (that piece of paper) is determined by the scale of your viewport (think of it as how much is the camera zoomed in on your model)

Once you have your layout setup as you want you can print it with a scale of 1:1 (meaning the paper will come out of the printer exactly the same size as you setup your layout)

Check out this tutorial from autodesk about this procedure.

[Jeanettebrooks84]

Hello again

I'm sorry, I honestly I have no idea of what you said.

My scale is 1:1 and I can't print in 1:1 that would take a lot of paper...

I need it to be in 1:20.

[Jeanettebrooks84]

Hi again

I have been through the link you sent, and do i need to download that pc3?

Regards

Jeanette

[leeminardi]

In an isometric drawing, lines in the direction of the pricipal axes (X, y, and Z) are drawn true lenght at 30 deg from the horizontal or vertically.  An isometric projection on the other had is the projection of a 3D object from a vantage point that shrinks the geometry such that lines parallel to the principal axes are scaled by a factor of sqrt(2)/sqrt(3) = 0.816...  (the length from corner to opposing corner of a side of a unit cube divided by the lengh diagonal of the cube).  This number is close to the ratio of your plotted scale vs full scale. 

Try a scale factor of (1/0.618) * (1/20)