Here are some key safety tips based on the provided documents:

1. Ventilation and Respiratory Protection: Use exhaust ventilation on permanent machining jobs to control dust. If ventilation is not sufficient, wear an approved respirator to protect against inhalation of harmful particles like asbestos or hexavalent chromium [1].

2. Handling Hazardous Materials: Avoid using compressed air for cleaning areas suspected of containing hazardous materials like asbestos or hexavalent chromium. Instead, use wet methods or a vacuum with a HEPA filter [2].

3. Personal Protective Equipment (PPE): Always wear appropriate PPE when handling materials that may contain hazardous substances. This includes gloves, masks, and protective clothing to prevent skin contact and inhalation [1].

4. Waste Disposal: Dispose of potentially harmful fluids and materials according to local environmental regulations. Use leakproof containers and never pour waste onto the ground or into water sources [1].

5. Crushing and Cutting Prevention: Ensure equipment is properly supported before performing maintenance. Do not rely on hydraulic cylinders alone, as equipment can fall if controls are moved or if a hydraulic line breaks [1].

6. Fire and Explosion Prevention: Keep flammable materials away from hot surfaces and ensure proper storage of fuels and lubricants. Regularly inspect and maintain equipment to prevent leaks that could lead to fires [3].

7. Burn Prevention: Allow engines and other hot components to cool before performing maintenance. Be cautious of hot fluids and steam, and relieve system pressure before disconnecting lines [4].

These tips are essential for maintaining a safe working environment and preventing accidents and health hazards.