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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Okumura Machinery Manufacturing Co., Ltd. was founded in Takamatsu City in 1952. We began manufacturing woodworking machines in 1965 and consistently focused on aluminum profile cutting in the 1970s, achieving success in this area. By focusing on the goal of ensuring and improving our customers' productivity, we became a market leader in aluminum cutting machine manufacturing. With a product range of over 100 items, we can meet various customer needs. Additionally, our semi-custom machine designs allow us to provide products tailored to various fields and company sizes. Our domestic product range, which exceeds 6,000 units, speaks to our capabilities. However, what we take particular pride in is that we have remained a grounded company that embodies the values of small and medium-sized enterprises, such as quality, flexibility, individuality, reliability, and closeness to our customers. One indicator of the superior quality of our products is their longevity, with many of our products being used for over 30 years. Our goal is to develop perfect products for our customers. We look forward to being your partner in providing products and services that understand and meet your needs at Okumura Machinery Manufacturing Co., Ltd.
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