FeatureCAM has a Counterdrill hole. These are the manufacturing steps:
- Spot-drill the top.
- Drill the smaller diameter hole.
- Drill 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:
- Spot-drill the top.
- Drill the larger hole on the top.
- Drill the smaller diameter.
You can 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, select the Spot drill and Drill options.
- On the Location tab, set the X, Y, and Z coordinates to 0.0.
- Create a second plain hole:
- On the Dimensions page, set the Diameter to 0.25 and the Depth to 0.75.
- On the Location page, set the Z location to -0.25
- On the Strategy page, deselect the Spotdrill option and select the Drill option.
- Create a group of the two holes:
- Arrange the holes so that the top hole is the first in the group.
- Select the Ordered option.
Select the group and create a library part.