To Machine the Counterbore

Use the 2D Pocket strategy with a 4 mm flat end tool to machine the counterbore on the single 4.5 mm hole.

1. On the ribbon, click CAM tab 2D Milling panel 2D Pocket .

Tool tab

For this pocket, a flat tool with a diameter less than 4.5 mm is required to plunge into the pre-drilled hole.

1. On the Tool tab, click the button to open the Tool Library dialog box.
2. From the Sample Libraries > Tutorial tool library, select tool #5 - Ø4 mm flat.
3. Click to close the Tool Library dialog.

Geometry tab

1. Click the Geometry tab. Make sure that the Pocket selections button is active.
2. Select the edge at the bottom of the counterbore.

Passes tab

On the Passes tab, change the following parameter values and leave all others at their defaults.

1. Set the Maximum stepover to: 0.5 mm
2. Disable the Stock to Leave check box.

Linking tab

To make sure that the tool plunges at the center of the hole, disable the lead-in.

1. Click the Linking tab.
2. Expand the Leads & Transitions group and disable the Lead-in (entry) check box.

Now, adjust the lead-out slightly to obtain a smoother exit.

3. Set the Linear lead-out distance to: 0.0 mm 
4. Set the Horizontal lead-out radius to: 1.0 mm 

Finally, make the tool plunge into the pre-drilled hole.

5. Expand the Ramp group, and select Plunge from the Ramp type: drop-down menu.

Start the Calculation

1. Click at the bottom of the Operation dialog box, or right-click in the graphics window and select OK from the marking menu, to automatically start calculating the toolpath.

The toolpath should appear as shown below.

Continue to To Machine the Countersinks...