Most manufacturers recommend replacing a cutting wheel when its diameter wears down to about 60-70% of the original size. For a standard 115mm (4.5") wheel, this means replacing at around 75-80mm. Continuing to use a severely worn wheel increases the risk of shattering, kickback, and uneven cuts. Always check the minimum diameter stamped on the wheel's metal hub or packaging. Using this logger helps you track wear precisely and get a warning before reaching unsafe levels.

Wear per cut varies significantly based on material and technique. Typical values: Mild steel: 0.10–0.20mm per cut, Stainless steel: 0.15–0.30mm per cut, Aluminum: 0.05–0.12mm per cut, Cast iron: 0.20–0.35mm per cut. Factors like feed pressure, cut length, material thickness, and wheel quality all affect wear rate. This tool lets you log actual measurements over time to establish your own baseline.

Common minimum safe diameters: 115mm (4.5") wheel → ~70-80mm, 125mm (5") wheel → ~80-90mm, 150mm (6") wheel → ~100-110mm, 180mm (7") wheel → ~120-130mm, 230mm (9") wheel → ~150-170mm. These are general guidelines—always verify with the manufacturer's specifications stamped on the wheel. Using a wheel below its minimum diameter can cause the bond to fail at high RPM.

Use proper technique: Let the wheel do the work—avoid excessive pressure. Keep the wheel at 90° to the workpiece to minimize side wear. Allow cooling periods during extended use to prevent glazing. Match the wheel to the material: Using the wrong abrasive type accelerates wear. Store wheels properly in a dry environment to prevent bond degradation. Don't twist or bind the wheel in the cut. Tracking wear with this logger can also reveal if a particular batch or brand wears faster than expected.

Yes, critically. As a cutting wheel wears down, its surface speed (meters per second) decreases at the same RPM. However, the centrifugal forces on the remaining wheel material change. A smaller diameter wheel experiences lower peripheral stress, so it can technically handle the same RPM safely. That said, the wheel's structural integrity near the hub may be compromised if worn too small. Always adhere to the manufacturer's minimum diameter specification—never exceed the max RPM rating stamped on the wheel regardless of wear.

Absolutely. This Cutoff Wheel Life Logger supports unlimited wheels. Each wheel tracks its own initial diameter, current diameter, minimum safe diameter, wear-per-cut default, cut history, and material notes. Use different names (e.g., "4.5in Steel Cuts", "5in Stainless") to distinguish them. Data is saved locally in your browser using localStorage, so it persists across sessions. You can also export all data as a CSV file for record-keeping or analysis in spreadsheet software.

Eyeballing wear is notoriously inaccurate—a 10-15mm diameter reduction is hard to spot visually but significantly affects performance. Systematic tracking helps you: (1) Predict when you'll need a replacement before a job, (2) Compare wear rates across brands to find the best value, (3) Identify if you're applying too much pressure, (4) Maintain safety by never running a wheel below its minimum, and (5) Optimize inventory by knowing your actual consumption rate. For professionals, this data pays for itself in reduced downtime and better purchasing decisions.

Cutting wheels (Type 1/Type 41) are thin (0.8-3mm) and designed for slicing through material—they wear primarily on the outer diameter. Grinding wheels (Type 27/Type 28) are thicker and wear on both the face and edge. This logger is optimized for cutting wheels where diameter reduction is the primary wear metric. For grinding wheels, you'd also need to track thickness loss and face flatness—a more complex tracking problem. However, you can adapt this tool for grinding wheels by using the notes field to record additional observations.