Noise

• Compressed air is forced through the tool, spinning a blade inside the tool before the air escapes from the vent ports. This creates a high-pitched sound that can damage the ear drums with prolonged use. Hearing protection needs to be worn when working with air-powered tools. Many small engraving tools are quieter than 85 decibels but still cause hearing loss over time.
  
  

Human Error

• Air-powered high-speed tools have two speeds, stop and go. High-speed starts on slippery surfaces can send the tool out of control. Loose attachments on the tool can fly off and become projectiles. Many air-powered tools use a quick connect. When this is not fitted properly into the locked position, the air hose could become a sweeping whip. Parts can become loose and need to be constantly checked.
  
  

Friction

• High-speed grinders, sanders and drills create heat at the site, causing the wood or metal to heat up. The air from the tool can send the heated dust or shavings to other areas, landing on flammable material. Grinders and sanders can sometimes grip the part you are sanding, which can rip the unit out of your hand and into your body. Rapid vibration after a while can create numbness in your hands, causing you to lose your grip.
  
  

Air Troubles

• The most dangerous risk of using high-speed air-powered tools is a pressure blow out. This could happen in the air line or the tool itself. When a part fails, the air still has to go somewhere and can build up fast and cause damage. Sometimes the tool can start on its own if left connected to a charged air line. Unexpected movements or erratic operation can occur when the pressure changes or the tool is poorly lubricated.