FeatureCAM has a Counterdrill hole. It is manufactured by spotdrilling the top, drilling the smaller diameter hole and then drilling the top diameter hole. The order of these is fixed, you cannot rearrange them in the Op. List. An alternative manufacturing strategy would be to:
Spotdrill the top
Drill the larger hole on the top
Drill the smaller diameter
Let’s use the part library to create a feature that uses the alternative manufacturing strategy.
Create a plain hole
Set the Diameter to 0.375.
Set the Depth to 0.25.
On the Strategy tab, click the Spot drill and Drill checkboxes.
On the Location tab, set the X, Y and Z coordinates to 0.0.
Create a second plain hole
On the Dimensions tab, set the Diameter to 0.25 and the Depth to 0.75.
On the Location tab, set the Z location to –0.25
On the Strategy tab uncheck the Spotdrill checkbox and check the Drill checkbox.
Create a group of the two holes
Arrange the holes so that the top hole is the first in the group.
Check the Ordered checkbox.
Select the group and create a library part.
See also Tips for library part objects.