Canadian Council of Independent Laboratories (CCIL) Practice Exam

The allowed planeness deviation for the ends of cylinders is indeed more than 0.05mm. This standard is crucial in manufacturing processes where precision is vital. The reason for this particular limit is that deviations in planeness can affect the alignment and functioning of the cylinder with other components in a mechanical system. If the ends are not sufficiently flat, it could lead to issues such as uneven wear, improper sealing, or misalignment, which can compromise the performance and durability of the product. Standards often establish these tolerances to ensure that the cylinders meet the operational requirements without excessive wear or malfunction during use. Deviations greater than this threshold would indicate a significant manufacturing defect, potentially impacting the overall integrity of the assembly involving the cylinder. Therefore, adhering to the specified deviation helps maintain quality control in the manufacturing process.