Zoom Followup

May 14, 2008

Since I wrote my last post I have made a Lisp Routine that will allow you to set your scale in either Imperial “Inches” or Metric, and also gives you a quick option to lock and unlock viewports.

Viewport Zoom to start the command type “vz”

Cadalyst is also a great place to get Lisp Routines

Layout Metric Scale Factors

May 8, 2008

One of the biggest questions I encounter from students is how to set their zoom factor on metric drawings in their layout. Since this is major question I am going to get straight to it before doing the other lessons.

The way that I have my classes set up, and I draw is that I have a Template with Layouts that are set up for imperial units (inches), and they always draw full size (Inches, Feet, MM, or Miles) in Model Space. After they draw full size the zoom the viewport to the appropriate zoom factor.

First off there are three ways of setting a Viewport to a specific zoom factor (scale).

  • Zoom ___xp while in Model Space
  • Use the Viewports toolbar while in Model Space (must be floating or docked horizontally

Viewports Toolbar

  • Properties of the Viewport while in Paper Space

Viewport Properties

With Imperial Units you can just type in the scale factor that you want to use; whether it is 1:1 (full), 2:1 (double),1:2 (half), ect. If you are using the Viewports toolbar you can use ratios such as 1:25.4 (full), 2:25.4 (double), .5:25.4 (half), ect but if you are using the Zoom command or Properties the ratios will not work.

In these cases it is easy to turn the ratio into a fraction. To do this you replace the colon with a slash & move the decimal places so that you have whole numbers on both sides.

  • 1:25.4 -> 1/25.4 -> 10/254
  • 2:25.4 -> 2/25.4 -> 20/254
  • .5:254 -> .5/25.4 -> 5/254

So what about other scales such as 3:4? First convert it to a fraction, then convert the fraction to decimal, and put it over 25.4 and complete the process.

  • 3:4 -> 3/4 -> .75/25.4 -> 75/2540

What if you don’t want to type the factors every time? In that case you can save them to your computer.

  • Type “SCALELISTEDIT” at the command line
  • Go to Format -> “Scale List”

Scale List

Click Add, and fill in your info. I like to name it with a “m” at the end so I know which ones are metric.

Add to Scale List

After you do this your new scales will show up both in the Toolbar and Properties. I hope this tutorial has helped with your understanding of setting Zoom factors for your viewports. As always remember to lock your viewport after you get the scale set.


March 4, 2008

Congratulations on finding this blog. Through this Blog I will be explaining AutoCAD commands, and Drafting Concepts. I will show you how to better use the commands, and what the different option do, and why they are useful. the drafting concepts will vary from beginner information to advanced… so stay tuned and be prepared to learn how to better use AutoCAD, and be a better draftsperson.

James Thornburgh