1. Blade Run-In (Idling) When using a new saw blade for the first time, allow it to idle for approximately 30 minutes. In hot summer conditions, the blade should be idled with coolant (water) applied. This process relieves internal thermal stress from the segment brazing process and ensures the blade maintains its tension and stability during high-speed rotation.
2. Block Securing The stone block must be at least 0.5 m³ and positioned securely. Use wooden dunnage (square timber) beneath the block to ensure a stable, flush fit. Center the block symmetrically on the workbench to maintain optimal balance and eliminate any vibration or shifting during operation.
3. Limit Switch & Clearance Adjustment Adjust the limit switches according to the dimensions (length, width, and height) of the block to ensure the blade's elevation and carriage traverse operate within a safe, effective range. Before initiating the cut, position the blade edge 10–20 mm away from the block. Ensure the blade passes 20–40 mm through the bottom of the block to complete the cut. Before traversing the carriage laterally, retract the blade completely from the kerf to a safe clearance of 150–200 mm to prevent accidental collisions.
4. Starting & Stopping Only perform test cuts after the idling blade has reached its optimal, stable operating speed. Never start the machine while the blade is in contact with the workpiece. Do not stop the blade's rotation mid-cut; power off the spindle only after the blade has fully exited the kerf.
5. Workpiece Stability If the stone shifts or vibrates during the cutting process, halt operation immediately. Re-secure the block firmly before resuming. Never attempt to adjust or move the workpiece while the machine is actively cutting.
6. Troubleshooting Blade Binding If the blade RPM drops significantly or it binds (jams) in the kerf, immediately stop and investigate. Common causes include drive belt slippage, a loose arbor/flange nut, excessive cutting depth, or an overly aggressive feed rate. Make the necessary mechanical adjustments before proceeding.
7. Peripheral Speed The blade's peripheral speed (surface speed) must match the hardness and abrasiveness of the stone being cut. Refer to standard technical tables for recommended speeds. Note: Forcing high cutting efficiency by using an improperly low peripheral speed will drastically reduce the blade's lifespan.
8. Feed Rate (Traverse Speed) Feed rates depend heavily on material properties. An excessive feed rate accelerates diamond wear or causes segment detachment, prematurely ruining the blade. Conversely, a feed rate that is too slow prevents the necessary breakdown of the metal matrix, causing the diamonds to "glaze over" (blunt) and lose their cutting ability. Enter the cut slowly and maintain a uniform feed rate throughout. Tip: For the initial entry or the first three passes on a new slab, reduce the standard feed rate by 50%. Convert cutting speeds based on the cutting area (cm²/min) when slab thickness varies.
9. Cutting Depth Medium-hard stones like marble and limestone can often be cut in a single pass (full-depth cutting). Hard, abrasive stones like granite and sandstone require multi-pass step-cutting. For granite on a single-blade machine, the typical depth per pass is 10–20 mm; for marble, 50–100 mm. For multi-blade block cutters, limit the depth to 3–5 mm per pass. Always adjust depth based on stone hardness, blade specifications, and machine horsepower (e.g., Level 1 for low-power finishing; Level 2 for high-power roughing).
10. Milling Direction (Climb vs. Conventional) "Climb cutting" (down-milling), where the blade rotates in the same direction as the stone feed, is preferred. "Conventional cutting" (up-milling), where the blade rotates against the feed, generates vertical lifting forces that can destabilize the stone. Whenever possible, use climb cutting. If conventional cutting is unavoidable, reduce the cutting depth to 33%–50% of the climb-cutting depth.
11. Process Optimization Summary The fundamental rule for parameter selection is: for softer, easily machinable stone, use deeper, slower cuts or shallower, faster cuts. The optimal balance of parameters (depth, speed, feed) should maximize cutting efficiency, ensure excellent slab finish quality, and prolong the life of both the steel core and the diamond segments. These factors are highly interdependent. For instance, if the blade cannot maintain its cutting speed, the segments have likely glazed over. In this case, you must "dress" the blade by temporarily decreasing the cutting depth and increasing the feed rate to expose fresh diamonds.