Grinding Wheel Dressing (Leaving Cert Engineering): Revision Notes
Grinding Wheel Dressing
What is grinding wheel dressing?
Grinding wheel dressing is a maintenance process that restores the cutting ability of a grinding wheel. Over time, grinding wheels lose their effectiveness and need attention to continue working properly.
The process involves using a diamond-tipped tool to clean and renew the wheel's cutting surface. This tool is secured to the machine table, and while the grinding wheel rotates, the diamond tool moves across the wheel surface to remove worn material.
The diamond-tipped tool is the preferred choice for dressing because diamond is harder than the abrasive materials in grinding wheels, making it highly effective at removing worn surfaces while maintaining precision.
Why grinding wheels need dressing
Grinding wheels develop two main problems during use that require dressing:
- Glazed wheels - This occurs when the abrasive particles become worn and dull, reducing the wheel's cutting ability significantly
- Loading - This happens when metal particles (swarf) become clogged and stuck on the wheel surface, preventing effective grinding
When these problems occur, the grinding wheel cannot cut properly and may cause poor surface finishes or excessive heat build-up. Dressing solves both issues by exposing fresh, sharp abrasive particles.
Critical Signs Your Wheel Needs Dressing:
- Excessive sparking during grinding
- Poor surface finish on workpieces
- Excessive heat generation
- Grinding wheel appears shiny or smooth (glazed)
- Metal particles visibly stuck to wheel surface (loading)