A pneumatic die grinder is a handheld rotary tool powered by compressed air. It is mainly used for grinding, polishing, deburring, finishing, and shaping metal or other hard materials. It is widely used in fabrication workshops, automobile garages, foundries, and maintenance work. How Does It Work?
• The tool is connected to an air compressor.
• Compressed air enters the grinder and rotates an air motor (rotor & vanes) inside.
• The motor spins the collet and spindle at very high speed (usually 20, 000–25, 000 RPM).
• A grinding stone, burr, or rotary tool attached to the collet performs the required operation.
• Speed is controlled by a throttle lever or trigger. Types of Pneumatic Die Grinders
• Straight Type – Long and straight body; used for general grinding and polishing.
• Angle Type (90°) – Head is at 90 degrees; used in tight or hard-to-reach areas.
• Extended/Long Reach Type – Long spindle for deep cavity work.
• Heavy Duty Type – Used for industrial and continuous applications.
Important Points
• Requires clean and dry compressed air (usually 6–8 bar pressure).
• Lightweight and suitable for continuous use.
• Less heating compared to electric grinders.
• Needs regular lubrication (air oil).
• Use proper safety equipment: gloves, goggles, ear protection.
• Common accessories: carbide burrs, mounted points, flap wheels, polishing pads.
Applications
• Deburring and chamfering
• Weld cleaning
• Mould and die finishing
• Surface preparation
• Rust removal
SAPSONS pneumatic die grinder is a high-speed, air-powered rotary tool used for precision grinding and finishing work in industrial applications.
