Which One Should You Use for Polishing Metal: ​Flap Discs or Grinding Discs?

We often encounter the choice between flap wheel and grinding wheel in metal polishing during industrial production. To address this issue, our flap disc manufacturers will give a simple analysis as follows:

Difference between Flap Wheel and Grinding Wheel

Grinding wheel

Grinding wheel is a commonly used abrasive tool, which is characterized by its large quantity and wide range of abrasives applications. It rotates at high speed to perform rough grinding, semi-precision grinding, precision grinding, cutting, slotting and other tasks on the outer circle, inner circle, flat and various profiled surfaces of metal or non-metal workpieces. It can be used not only for grinding, but also for cutting.

Flap disc

Flap disc is a simplified product of flap wheel, mainly used for grinding and polishing in industrial production. It is also a type of consumable abrasive products in the industry. The page blade varies in quantity and shape and is evenly distributed in a fan shape on the mesh, nylon, plastic, steel paper and other substrates. It has a particle size of 36#-400#, with 60# and 80# being the most common. With the outer diameter of 4"-7", it is mounted on the angle grinder and is used for grinding and repairing welds, burrs, and chamfering. It can replace the resin bowl-shaped grinding wheel and has good elasticity, high efficiency, good heat dissipation, and low noise. It is suitable for grinding and polishing various stainless steel and carbon steel structural parts. It is widely used in shipbuilding, automobile, aviation, machinery, instruments, bridges, construction industries and the grinding of metal and non-metal materials, such as removal of rust, paint and burrs, and polishing of welds.

Therefore, the uses of the two cannot be understood as a single concept. Grinding wheels are mainly used for cutting and grinding, and the corresponding installation of the grinding wheel machine and cutting machine is also different; flap discs are purely used for polishing and have a softer texture. The resulting grinding effect may differ more.

Meaning of 60 grit and 80 grit flap disc

We all know that flap discs are also called flexible grinding discs, which are mainly used in the manufacturing industry, construction industry, the fields of metal and non-metal materials for rust removal and grinding. But flap discs can be divided into 60 grits, 80 grits, 100 grits, 120 grits, 240 grits, and 320 grits. What do these numbers mean? What are the differences between them?

In fact, these numbers, 60, 80, 120, 240, 320, represent the grit size of the abrasive particles. The smaller the number, the larger the grit size and the sharper it is; the larger the number, the finer the grit size and the smoother the grinding surface. If the surface is rough, you can first use 60 grit or 80 grit to grind it, then gradually move to 320 grit to achieve better results.

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