3. What is the number of teeth (pitch) of a chip saw?
The "number of teeth" on a chip saw refers to the number of blades (teeth) attached around the circumference of the disc-shaped blade.
The "pitch" of a chip saw refers to the spacing between the blades; if there are more blades, the pitch is finer, and if there are fewer blades, the pitch is coarser. In aluminum cutting, this "number of blades" has a significant impact on cutting precision, speed, and the occurrence of burrs. ▶️Basic Principles for Selecting the Number of Blades ✅ It is ideal for 2 to 3 blades to be in contact with the material simultaneously at all times. ✅ The thinner the material, the finer the pitch (i.e., more teeth) is required. ✅ For thicker or harder materials, a coarser pitch (i.e., fewer teeth) provides more stability.
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▶️ Selection Guidelines Based on Material Thickness | Material Thickness | Recommended Number of Teeth (φ405) | Features | |------------------------|-------------------------------------|-----------------------------------| | 2mm or less (thin plate) | 100-120 teeth | Less burr, focus on finishing | | 5-10mm (medium plate) | 80-100 teeth | Balanced cutting performance and speed | | 30-50mm (thick plate) | 50-70 teeth | Easier chip removal, prevents burning and welding | *These values are guidelines and may need adjustment based on material hardness and machine conditions. ▶️ Relationship Between Number of Teeth and Cutting Quality | Item | Many Teeth (Fine Pitch) | Few Teeth (Coarse Pitch) | |------------------------|-------------------------------------|-----------------------------------| | Surface Finish | Clean and smooth | Rough but fast | | Burr Generation | Few | Can occur depending on conditions | | Cutting Resistance | Slightly high | Easier to keep low | | Heat Generation | Tends to rise | High heat dissipation | | Tool Life | Prone to wear under overload | Load is easier to distribute |
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▶️Points to Note for Tooth Count Selection - If the material is too thin and the tooth count is low, the teeth will contact one by one, causing burrs and vibrations. - Conversely, using too many teeth on thick plates can cause chips to clog between the teeth, increasing the risk of welding, burning, and tooth chipping. ▶️Practical Tips: ✅ Ideally, 2 to 3 teeth should be in contact simultaneously at all times. ✅ Consider the machine feed speed and cutting method when making your selection. ▶️Example of Chip Saw Product Labeling (with Tooth Count) Example: φ405 × 3.0t × 2.5×100Z×φ25.4 Blade Type Triple - Outer diameter: 405mm - Blade thickness: 3.0mm - Base thickness: 2.5mm - Tooth count: 100 - Inner diameter: 25.4 → In this case, a finer setting with 100 teeth is optimal for thin to medium-thick extruded materials. ▶️Support from Okumura Machinery Manufacturing We offer the "OKUMURA SELECT" service, which proposes the optimal combination of outer diameter, blade type, tooth count, and pitch based on the material, dimensions, and working conditions of the cutting target. If you would like to select safe and reliable cutting conditions based on actual machine test data, please feel free to consult us.
