Difference between Constant Cutting Speed vs Fix Rpm Cnc Machine Santosh Yadav Cnc Basic Cad Cam

Cutting speed in a CNC machine refers to how fast the cutting tool engages the material, usually measured as surface speed (meters per minute or feet per minute). It’s a key parameter that affects tool life, surface finish, and machining time. CNC BASIC TRAINING CENTER Address :- 1158 Krishna Nagar, Opposite - Uttam Industries , Meerut road Ghaziabad UTTAR PRADESH Near Shri Ram Piston factory PIN (201002) निकट मेट्रो स्टेशन :- न्यू शहीद स्थल ग़ज़िआबाद बस अड्डा COUSE DETAIL :- CNC Programming (FANUC CONTROL) CNC Setting(FANUC CONTROL) CNC Operating (FANUC CONTROL) Contact or Whatsapp number 09910440210 , 08130390626 Factors Affecting Cutting Speed Material of the workpiece Tool material (HSS, carbide, ceramic) Type of operation (turning, milling, drilling) Coolant use Desired surface finish Machine rigidity In CNC machining (especially turning on lathes), Constant Surface Speed (CSS) keeps the cutting speed (Vc) constant by automatically adjusting spindle RPM as the tool moves along the workpiece diameter. What is CSS Mode? Activated using G96 The machine varies RPM so that cutting speed remains constant As diameter decreases → RPM increases As diameter increases → RPM decreases This ensures: Uniform surface finish Consistent tool wear Better machining efficiency CSS cancel means turning OFF constant surface speed control and switching back to fixed spindle speed. The terms surface speed and cutting speed are often used in CNC machining, and this causes confusion—but in most practical cases, they mean almost the same thing, with a slight difference in context. Cutting speed is the speed at which the cutting tool engages the workpiece material. Measured in m/min (meters per minute) or ft/min It represents how fast material is being removed at the cutting edge Used in: Turning Milling Drilling “Surface speed” comes from describing motion of rotating parts “Cutting speed” comes from machining theory In real CNC work, they are used interchangeably #career #cutting speed #surface speed #sanvi #machine #cncvmc #cncbasiccadcam #santoshyadav #tools #cadcam #gcoding #designing #mechanicalengineering #rpmcalculation #cncfinish #jobwork