1. Material Characteristics: Both marble and glass are brittle and can crack under excessive force. Adjust water pressure and cutting speed appropriately to avoid damage.

2. Cutting Speed: Reduce the cutting speed to minimize heat and vibration, which can cause cracks in the material.

3. Nozzle and Abrasive Selection: Choose the right nozzle size and fine abrasive particles to ensure precision and smooth edges. Finer abrasives are typically used for brittle materials.

4. Support and Stabilization: Secure the marble and glass properly to prevent movement or vibrations during cutting, ensuring accurate results.

5. Cooling and Lubrication: While the waterjet provides cooling, additional cooling measures may be necessary for thicker materials to prevent heat-induced cracking.

6. Safety Precautions: When cutting glass, wear protective gear such as goggles and gloves to guard against flying debris.

By adjusting cutting parameters and taking safety measures, you can achieve high-quality cuts in marble and glass with a waterjet machine.