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What is the formula for CNC turning?

July 28, 2023

CN (Computer Numerical Control) turning is a machining process used to create cylindrical parts by removing material from a workpiece using a rotating cutting tool. The formula for CNC turning primarily involves calculating the spindle speed (RPM) and the feed rate (F) for the cutting tool. These calculations depend on the material being machined, the diameter of the workpiece, and the desired surface speed.

Here are the formulas for spindle speed and feed rate in CNC turning:

1. Spindle Speed (RPM):

[ text{Spindle Speed (RPM)} = frac{{text{Cutting Speed (S)}}}{{pi times text{Diameter of the Workpiece (D)}}} times 1000 ]

- Cutting Speed (S) is the desired surface speed of the material being machined, usually given in meters per minute (m/min) or feet per minute (ft/min).
- Diameter of the Workpiece (D) is the size of the workpiece being turned, typically given in millimeters (mm) or inches (in).

2. Feed Rate (F):

[ text{Feed Rate (F)} = text{Number of Cutting Edges (N)} times text{Spindle Speed (RPM)} times text{Chip Load per Tooth (CLPT)} ]

- Number of Cutting Edges (N) refers to the number of cutting edges on the turning tool (usually 1 or 2).
- Chip Load per Tooth (CLPT) is the amount of material being removed in one revolution of the cutting tool, typically given in millimeters per tooth (mm/tooth) or inches per tooth (in/tooth).

Keep in mind that these formulas are general guidelines and might vary based on the specific CNC machine, tooling, and cutting conditions. Machinists often rely on CNC programming software or machining handbooks to help determine the appropriate cutting parameters for a particular job. Always follow the manufacturer's guidelines and best practices for your specific CNC turning setup.


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