Effects of Cutting Fluids• Selection of a cutting fluid based on:1. Workpiece material (工件材料)-應力腐蝕破裂2. Machine tool components (工具母機組件)-內部金屬/非金屬相容性3. Biological considerations (生物學考量)4. Environment (環境)-金屬片(鉛…)/微粒子• Machine-tool operator is in close proximity to cutting fluids, thus health effects is a primary concern• Progress has been made in ensuring the safe use of cutting fluids• Recycling involves treatment of the fluids with various additives(添加劑, biocides (殺菌劑), deodorizers (除臭劑) and water treatment