4. Calculation and Setting Method for the Blade Rotation Speed and Peripheral Speed of the Tip Saw
To operate an aluminum cutting saw blade safely and with high precision, understanding the "rotational speed of the blade" and the "cutting edge's peripheral speed (Vc)" is essential.
▶️Introduction In aluminum cutting operations, the "rotational speed (rpm)" and "peripheral speed (Vc)" of the cutting tool are important parameters that influence cutting quality, tool life, and safety. By properly setting the rotational speed and peripheral speed, the following effects can be expected: ✅ Improvement in the quality of the cut surface ✅ Extension of tool life ✅ Reduction of motor and machine load ▶️What is rotational speed (N)? ✅ Definition: A value that represents how many times the cutting blade rotates in one minute (unit: rpm) ✅ It is adjusted in conjunction with motor rotation and inverter settings. ▶️What is peripheral speed (Vc)? ✅ Definition: The distance the cutting edge of the blade moves in one minute (m/min). (Unit: m/min or m/s) ✅ It is the speed of the cutting edge in contact with the material and directly affects the finish of the cut surface.
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Calculation of Peripheral Speed Vc (m/min) = π x D (mm) x N (rpm) ÷ 1000 *If converting to m/s, please divide by 60 again. ▶️ Example: For a φ405mm blade at 3000rpm Vc = 3.14 x 405 x 3000 ÷ 1000 = 3815m/min (≈ 63.6m/s) ▶️ Guidelines for Peripheral Speed (by Material) Material Type | Peripheral Speed Guideline (m/s) | Notes Pure Aluminum / Soft Alloys | 70–90 | High speed is acceptable. Focus on sharpness. Aluminum Alloys (e.g., A5052) | 50–70 | Balanced type. Quality and speed coexist. Cast Iron (e.g., ADC12, Si-based) | 15–40 | Prone to wear, proceed cautiously at low speeds. ▶️ Setting the Tool Rotation Speed The rotation speed (N) can also be calculated by reversing from the target peripheral speed. ✅ Reverse Calculation Formula for Rotation Speed N (rpm) = Vc (m/min) x 1000 ÷ (π x D (mm)) ▶️ Example: For Vc = 60m/s (3600m/min) / Blade φ355mm N ≈ 3600 x 1000 ÷ (3.14 x 355) ≈ 3,228rpm
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▶️ Points in Actual Settings ✅ Do not exceed the maximum allowable rotational speed of the blade! → Each cutting blade has a specified "maximum operating rotational speed." Exceeding this increases the risk of damage and is very dangerous. ✅ Set according to the performance of the motor and drive components → Increasing the speed will raise the cutting speed, but it will also increase power load and vibration, so adjustments need to be made within a range that does not strain the machine. ▶️ Common Misconfigurations and Troubleshooting Examples Trouble | Cause | Solution Rough cutting surface | Peripheral speed is too slow | Increase the rotational speed, aiming for over 60m/s Aluminum welded to blade | High rotational speed but slow feed | Adjust the balance with feed speed to prevent heat concentration at the blade edge Blade chipped/burned | Peripheral speed is too fast; high load | Lower the rotational speed or reconsider the number of teeth (change to fewer teeth) ▶️ Support from Okumura Machinery Manufacturing At Okumura Machinery Manufacturing, we support the setting of safe and optimal rotational speeds and peripheral speeds according to the blade used and material characteristics. The URKG series incorporates maximum rotational speed control and inverter speed control within the control panel, allowing for safe high-speed cutting.
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In aluminum cutting operations, the "rotational speed (rpm)" and "peripheral speed (Vc)" of the cutting tool are important parameters that influence cutting quality, tool life, and safety. By properly setting the rotational speed and peripheral speed, the following effects can be expected: ✅ Improvement in the quality of the cutting surface ✅ Extension of tool life ✅ Reduction of motor and machine load
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If the rotation speed of the chip saw is too fast, there seems to be some problem.
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When cutting thick plates, what happens if the rotation speed is not correct?" "If the rotation speed is not correct, it negatively affects the performance of the cutting tool. In particular, if the rotation speed of the tool is high but the feed rate is slow, the cutting edge can become too hot. When heat builds up, chips can weld to the cutting edge, causing the cutting process to become less smooth." "That would be a problem..." "That's right. It's important to match the correct rotation speed and feed rate. By the way, there are related videos where you can see cutting scenes with optimally adjusted rotation speeds and feed rates, so you can refer to how the work progresses in practice.
