Finitura Every lining, after vulcanization and final tests, can be finished off in order to respect eventual dimensional tolerances, to make better its performance or to modify the appearance. The finishing operation can be performed both with hand tools and machine tools, in consideration of the grade of finishing or precision required. Hand tools finishing It is important to level the coupling surfaces. Use appropriate tools to reach points of uneasy access. The type of tool must be carefully selected in connection with the type and hardness of the lining. Machine tools finishing If required, the linings can be machined by means of machine tools: lathe, grinder, drilling machine, milling machine, etc. In case of hard rubber linings, pay attention to cut and feeding speeds. Soft rubber linings can be processed only by polishing wheels whose characteristics must be carefully checked before use. Special machining of flanges On the flat part of the pipes flanges, the lining can be machined to an high degree by means of special equipment expressly studied for lined flanges.