Yes, the #3. (I should have clarified that). The new CNC machines are not the same as the ones in the book the GP linked to. CNC use requires ballscrews and rol

Yes, the #3. (I should have clarified that). The new CNC machines are not the same as the ones in the book the GP linked to. CNC use requires ballscrews and roller ways, instead of leadscrews and sliding ways. As a result the machine and its manufacturing process are quite different. But you're right, the article specifies that it's computer controlled, so probably not a #3.