Patent ID: 7937849
Filing Date: 2011-05-10
Classification: G01B

Abstract:
1. A tool for determining concentricity between a sleeve and a rod to be arranged within the sleeve, comprising: a body portion having a major axis and housing an array of elements constrained for linear motion therealong, a nose portion having a major axis and extending from said body portion and configured for insertion into the bore of the sleeve and including independently extendable probe pins for engaging the inner surface of the sleeve, the probe pins being arranged normal to one another and being movable in a direction radially outward from said nose portion into a first extended position in which the free end of each pin is engaged with the sleeve inner surface, each probe pin being movable into said first position by movement of a respective independent array of elements in the body portion in a first direction parallel with the body portion major axis, locking elements carried by the body portion, each said locking element being engagable with one element of each array of elements within said body portion for locking the array and hence the pins in an extended position, and a measuring mechanism carried by the body portion for determining the distance that the pins have been independently extended from a zero extension position based on a measured movement of at least one element of each array of elements.