You mean, making a vertical spike in a flat piece of stock? Here is one way to do it in CamBam:
- Draw a small diameter circle (0.1mm or so).
- Create an outside profile MOP.
- In the MOP properties, set Side Profile Method to "Slope" and Side Profile Value to "30".
Of course, you need to set Stock Surface, Target Depth and Depth Increment as well. The smaller the Depth Increment, the smoother your spike would be.