A control system for chatter avoidance by ramping the spindle speed

This paper presents a new control system for chatter avoidance in milling. The control system monitors the cutting process using a statistical indicat or named the R-value which is computed from the cutting force signal. When chatter is detected, the control system ramps the spindle speed in search o f a speed at which chatter ceases. The system does not involve time consumi ng computations and therefore is suitable for on-line implementation. Also, it does not interrupt the cutting process by halting the feedrate or the s pindle speed. Simulations showed that the control system has a significant chatter avoidance potential in the high speed range, and also far partial a nd full immersion cuts. The system was implemented successfully to avoid ch atter in slotting and half immersion down milling.