During end cover to stator match marking, which method should be avoided to prevent damage?

Using a hammer and punch along with an etching tool on components like stator end covers can lead to damage because both methods introduce forces or material changes that can compromise the integrity of the stator. The hammer and punch method can create stress points or fractures, while an etching tool can remove material, potentially affecting the fit or leading to leaks if the stator is part of a sealed system.

In contrast, using a felt pen for match marking is a gentler method that does not involve altering the material or introducing stress. It allows for clear and precise markings without the risk of causing physical damage to sensitive components during the match marking process. Therefore, for the safety and integrity of the stator, it is advisable to avoid both the hammer and punch and the etching tool.