Re: [CAD_CAM_EDM_DRO] cnc tapping Re: General Tool Life Question

> What you gain by "differential threading" as Ian explained is that
> the hole can be tapped without reversing the headstock spindle to get
> the tap out of the hole. The main spindle can continue running at
> very high speed, 5000+ rpm would not be unusual. This method is
> widely used in multi-axis swiss screw machines where several tools
> are cutting simultaneously. The other tools can continue their
> cutting operations on the OD of the part as the tapping operation is
> happening. The concept was perfected years ago on cam operated swiss
> machines and continues on CNC swiss type machines. It not unusual
> for a swiss type machine to have as many as 5 tools cutting at the
> same time.