Richdar 7inch angle grinder with variable speed

7-inch Angle Grinder:

A 7-inch angle grinder is considered a medium to heavy-duty size for angle grinders.

• Power: They typically require more powerful motors (often 15+ amps for corded versions) to spin the larger diameter discs effectively and maintain torque under load.
• Applications:
  • Cutting: Excellent for cutting thicker metals (steel, rebar, pipes), concrete, masonry, and stone.
  • Grinding: Good for aggressive material removal, grinding down welds, shaping metal, and preparing surfaces.
  • Wire Brushing: Effective for large-scale rust removal or surface cleaning.
• Weight & Size: 7-inch grinders are heavier and larger than common 4.5-inch or 5-inch grinders, making them less agile for detailed work but more efficient for big jobs. They usually require two-handed operation.

Variable Speed Feature:

This is a highly desirable feature on an angle grinder, especially for a 7-inch model.

• Why Variable Speed is Good:
  • Versatility: Allows you to adjust the RPM (Revolutions Per Minute) to suit the specific task and material.
  • Controlled Cutting/Grinding: Slower speeds are better for delicate work, polishing, or working with materials that might burn or melt at high speeds (e.g., plastics, some stainless steel).
  • Reduced Heat Buildup: Slower speeds can prevent excessive heat buildup, which can discolour metal or degrade abrasives faster.
  • Improved Finish: For polishing or finishing tasks, lower speeds give you more control and a finer finish.
  • Using Different Accessories: Some accessories (like certain wire brushes, flap discs, or polishing pads) have optimal operating speeds lower than the maximum speed of a fixed-speed grinder.