Hole Types

Note: The Z value for the square block is 0.5 in these examples.

To create a thru hole:

1. Draw a circle.
2. Set Z to Air Inside.

To create a countersink:

1. Draw a circle.
2. Set Z to Air Inside.
3. Choose Line | Machine | Auto | Chamfer and select the desired settings.
   
4. For the angle use 90 minus head angle / 2. For example, for an 82 degree head use (90 - 82/2 = 49).
5. Adjust the chamfer size so the side view fits a drawing of the flat head screw which you can make using Comments To Myself. (Using a chamfer size of (head diameter - screw diameter) / 2 does not account for recessing the head or any rounding at the edge of the head.)
   

To create a counterbore:

• For the outer circle set Z to minus the bore depth.
  

To create a blind hole:

• Set Z to a negative value less than the overall part depth.