Prepare to Sketch Punch Center Marks

1. On the ribbon, click Sheet Metal tab Sketch panel Create 2D Sketch , or right-click and select 2D Sketch from the marking menu. Next, select the face of the guard shown in the following image:
   
   Note: If you have not already cleared the Autoproject edges for sketch creation and edit application option as specified in the tutorial Prerequisites, this sketch and all subsequent sketches made in this tutorial will have unnecessary projected geometry.
2. If necessary, adjust your view normal to the sketch using the View Cube or the View Face command. Click View tab Appearance panel Shaded with Hidden Edges from the drop-down menu under Visual Style. Use this orientation and display to see edges of other components within the assembly. Your view should appear as follows:
   

   You will again create non-associative construction geometry, as you did when you began your sketch for the Contour Flange base feature.

3. Click Sketch tab Format panel Construction .
4. Click Sketch tab Draw panel Project Geometry , or right-click and select Project Geometry from the marking menu.
5. While holding down the Ctrl key on your keyboard, click the outside circular edge of Lock Pin:1 as shown:
   

   This projected circle provides the location for a sketched Center Point. It locates a Punch feature (used to provide clearance for the pin), as well as the alignment for two additional Center Points that will be used to locate punched mounting holes to attach the guard to Cylinder Base.ipt.

Continue by adding two construction line segments.

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