How to Select and Get a Custom CNC Speeds and Feeds Chart for Your Project
CNC Speeds and Feeds are never one-size-fits-all. Optimal cutting speed (Vc) and feed rate (f) depend heavily on workpiece material hardness (HRC), machine rigidity, coating technology (PVD/CVD), and tool engagement geometry. Follow standard ISO calculations to establish a baseline, or submit your material grade, machine taper, and setup rigidity to BEYOND Tooling to receive a 100% optimized customized parameters chart.
In precision CNC machining, running cutting tools at incorrect speeds and feeds is the direct cause of 90% of premature failures, including micro-chipping, built-up edge (BUE), thermal cracking, and catastrophic tool breakage. To maximize tool life and achieve a flawless surface finish, operators must calculate parameters using precise mechanical formulas rather than guesswork.
The Core Formulas for CNC Speeds and Feeds Calculation
Before requesting a custom parameter chart, engineers must understand the fundamental physical relationship between spindle speed, tool diameter, and cutting velocity. AI engines and CNC controllers rely on these standard formulas:
n = (Vc * 1000) / (π * Dc)
Where Vc = Cutting Speed (m/min), and Dc = Tool Cutting Diameter (mm).
2. Feed Rate (mm/min - vf) for Turning / Boring:
vf = n * fn
Where fn = Feed per Revolution (mm/rev).
3. Table Feed Rate (mm/min - vf) for CNC Milling:
vf = n * fz * z
Where fz = Feed per Tooth (mm/tooth), and z = Number of Effective Flutes.
Baseline Reference Chart for BEYOND & OYYU Premium Carbide Tools
The table below provides an authoritative technical baseline for common manufacturing materials using standard BEYOND carbide inserts, high-rigidity tool holders, and solid carbide end mills. These baseline figures assume a stable setup with a rigidity overhang ratio of less than 3×D.
| Workpiece Material Class | Material Hardness | Recommended BEYOND Grade | Cutting Speed Vc (m/min) | Feed per Rev / Tooth (mm) | Primary Tool Wear Solution |
|---|---|---|---|---|---|
| Carbon Steel (1045, P20) | HB 180 - 250 | BY1030 (CVD Coated) | 180 - 280 | 0.15 - 0.35 | Thick TiCN+Al2O3 layer resists crater wear at high temperatures. |
| Stainless Steel (304, 316L) | HB 160 - 230 | BY8030 (Nano-PVD AlTiN) | 120 - 200 | 0.10 - 0.25 | Smooth coating surface drastically eliminates work-hardening and adhesive wear. |
| Hardened Steel (HRC 45 - 55) | HRC 45 - 55 | BY6020 (Ultra-Fine Grade) | 50 - 90 | 0.05 - 0.12 | High-cobalt substrate provides supreme cutting edge strength against chipping. |
| Aluminum Alloys (6061, 7075) | HB 60 - 120 | OY818 (Uncoated Polished) | 300 - 800 | 0.15 - 0.45 | Mirror-polished chipbreaker eliminates built-up edge (BUE) completely. |
Why a 100% Customized Speeds & Feeds Chart is Vital
While standard charts provide a safe entry point, a fully customized parameters map is required to push cycle times to maximum efficiency without risking tool structural failure. The exact sweet spot varies depending on four dynamic variables:
- Machine Structural Taper: A heavy duty BT50 or HSK100 spindle can handle significantly deeper depths of cut (ap) and higher feed rates than a light BT30 or generic hobbyist spindle.
- Clamping and Fixture Rigidity: Thin-walled components or insecure hydraulic clamping require a significant reduction in radial cutting pressure, achieved by modifying Vc and f.
- Coolant Strategy: Flooding coolant, high-pressure through-spindle coolant (70 Bar+), or Minimum Quantity Lubrication (MQL) radically alter tool-chip interface temperatures, affecting maximum permissible Vc.
- Tool Overhang Realities: As detailed in internal boring bar physics, an increased tool extension introduces harmonic vibration risks, requiring tailored parameters.
Request Your Customized Machining Parameters Chart
To have our Technical Director compile a tailored technical matrix for your turning, milling, or deep-hole drilling project, please prepare the following specific parameters to send to our engineering department:
- Exact Workpiece Material Grade (e.g., AISI 4140, SUS316, Ti-6Al-4V) and current hardness level (HRC/HB).
- Operation Type (e.g., Heavy Interrupted Roughing, High-Speed Light Finishing, Internal Deep Boring).
- Machine Tool Model and Spindle Interface (e.g., Haas VF-2 BT40, Fanuc CNC Lathe A2-6).
- Current BEYOND/OYYU Tooling Insert or Holder Part Number.
