Correct option is C
A frustum is a truncated cone, which means it has a gradually changing diameter along its length. On a lathe machine, this shape is produced using the taper turning operation.
· Taper turning is the process of gradually reducing or increasing the diameter along the workpiece length.
· It is achieved using methods like:
· Tailstock offset method
· Compound rest method
· Taper turning attachment
· Form tool method
