Abstract: A method for measuring concentricity of one cylindrical member arranged in a second cylindrical member includes the steps of inserting a tool in the second cylindrical member, moving a first set of elements carried by the tool into engagement with the inner surface of the bore, establishing a “zero” position for the first set of elements, measuring for each element the distance of movement from the “zero” position of that element to the position where that element engages the inner surface of the bore. The method further entails adjusting the position of first cylindrical member relative to the second member within a tolerance range based on the distances measured from the “zero” positions.

Abstract: A tool for determining concentricity between a sleeve and a rod to be arranged within the sleeve includes a body portion having a major axis and housing an array of elements constrained for linear motion therealong, a nose portion configured for insertion into the bore of the sleeve and including radially extendable probe pins for engaging the inner surface of the sleeve, the probe pins being movable into engagement with the sleeve inner surface by movement of the array of elements in the body portion in a first direction parallel with the major axis, locking screws carried by the housing body and engageble with one element of the array of elements for locking the array and hence the pins in an extended position, and a measuring mechanism for measuring the distance that the pins have been extended from a zero extension position.