Concentricity test device

A test device for testing whether an axis of a first portion of an article is coaxial with an axis of a second portion of the article, the test device comprising:

• a supporting member;
• a benchmark member fixed to a first end of the support member, the benchmark member comprising a first test portion to position the first portion;
• and
• a test member slidably mounted to a second end of the support member opposite to the first end, and the test member operable to slide toward or away from the benchmark member, the test member comprising a second test portion to position the second portion;
• wherein a central line of the first test portion is coaxial with a central line of the second test portion, within a coaxial tolerance, and wherein after the first portion is positioned to the first test portion, the test member is moved toward the benchmark member, if the second portion is capable of being positioned to the second test portion, the article is qualified, if the second portion is incapable of being positioned to the second test portion, the article is unqualified.