STEPS:
Open the Catia V5 application. The assembly workbench is opened it is default. Close the assembly workbench and Go to START--->MECHANICAL DESIGN---->SKETCHER, Now enter the part name what you want and click the enable hybrid design checkbox and ok.
Select YZ plane and click sketch tool.
First you have to draw the outer loop of the drawing. This drawing is symmetry about Y axis, so draw half portion and mirrors it remaining. Click the profile tool from profile toolbar.
After pick a profile tool, click at (0,0) and draw line as shown in fig 2.1. After draw these lines constrain (Dimensioning) this as shown in fig.2.2
Select the sketched element and select mirror tool and click vertical direction (Y-Axis). After mirror the drawing will be shown in fig2.3
Now pick circle tool from profile toolbar and draw the two circles and constraint this as shown in fig and pick the quick trim tool then delete the unwanted line.
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