Picture of Importing Inventor files to CorelDraw
This Instructable is part 2 of a series that began with Draw Kerf Combs in Autodesk Inventor, a friendly project-oriented introduction to 2D work in Autodesk.  We assume you've already finished and saved a sketch (whether of kerf combs or something else.)

Several techniques apply to any imported file you may wish to laser cut!

We'll learn about:

If you have just finished drawing your kerf comb, keep Autodesk Inventor open.  Otherwise, open Inventor and load your saved file. 
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Step 1: Export as DWG

Picture of Export as DWG
1.  From the Inventor menu, select Export -> Export to DWG. 
2.  Select a name and location and click Save.

Step 2: Import into CorelDraw

Picture of Import into CorelDraw
Fire up CorelDraw.  Then: 

1.  Open your .dwg file.
2.  The Import AutoCAD File dialog box will open.  Make sure that "3D Projection" is set to Top and Units are set to English.  (If you are importing an original drawing in metric, select Metric.) 
You should be able to set scaling to 1:1.  Check Original Size and New Size to make sure they don't say anything absurd.

Step 3: Check line width

Picture of Check line width
Select both combs by using Select All or pressing Ctrl+A.  Then double-click on the pen symbol lower right corner of the CorelDraw window.  The Outline Pen dialog box will open.  Make sure that the line width is set to Hairline. 

Step 4: Label comb

Picture of Label comb
It's hard to measure kerf if you can't tell which tooth is which! 

1.  Click the Text tool (or click F8.)
2.  Draw a box on the first comb.
3.  Type the tooth and notch widths you used to draw the comb.  It may help to reduce the font size (I used 10 pt.)
4.  When you're done, you can copy the text and paste it onto the second comb.