Die grinders are special tools that are used to polish and buff the inside of any cylindrical object. Typically, a die grinder has a cylindrical-shaped object, known as the grinding nose, which is attached to its bottom end. This object can be used to grind, polish, and buff the various metal surfaces that are fed into the die grinder. Further, a die grinder is often used to grind away metallic spurs; these spurs often cause problems in metal piping connections. Thus, in short, the primary function of a die grinder is to smooth metal surfaces smooth and ensure their proper functioning.
RPM and No-Load Speed
The efficiency of all die grinders is measured by rotations per minute (RPM) and no-load speeds. While RPM refers to the number of rotations made by the grinder, per minute, the no-load speed refers to the spindle’s rotation when the tool is idling. The no-load speed should always be higher than the RPM; otherwise, there are high chances of the breaking of the spindle. The difference in the RPM and the no-load speed of the die grinder makes it suitable for different kinds of metals and finishes.
Types of Die Grinders
There are several different types of die grinders, ranging from small hand-held and portable die grinders to fixed, bench-top models. The size and the make of a die grinder are primarily dependent on the function of the grinder. Further, most die grinders come with removable attachments that can be used for different functions. That said, die grinders can be broadly divided into 2 types, those powered by electricity and those that are pneumatic powered. Given below is a brief description of two types of die grinders.
Bench Grinders: Bench grinders are large die grinders that are perfect for sharpening hand tools, cutters, blades, and bits. These grinders are stationary machines that are fixed to a work bench. These grinders are powered by large motors, ranging from 1/3 to 1 horsepower. This machine is ideal for working with harder materials like tungsten and carbide. The diameter of the wheel also varies and can range from 6 to 10 inches, depending on the function of the grinder.
Straight or Angle Grinders: Both straight and angled grinders are portable tools and are hand-held, as opposed to the bench grinders. These grinders have wheels on them and are used to work on pieces that are too large to be worked on a bench. These grinders come with relatively smaller motors of 0.4 to 15 amps. These grinders spin at the speed of 4000 to 11,000 revolutions per minute. There are some grinders that also have a mechanism through which one can adjust the speed. Lower speeds allow for better polishing of the surface, whereas higher speeds help in creating a rough texture on the surface. For instruments that have to be used for heavy use, a motor with a high amp should be considered. This allows the instrument to continue grinding without slowing down in the middle.