A tire or tire casing inspection machine, comprising: a sealable enclosure formed within a housing, the sealable enclosure adapted to be selectively subjected to positive gage pressure and/or vacuum when testing a tire or tire casing disposed within the sealable enclosure; a table disposed within the sealable enclosure and connected to a portion of the housing, the table having an opening that is adapted to be aligned with a bead hole of the tire or tire casing disposed on the table; a shearographic assembly connected to the housing and disposed within the sealable enclosure in alignment with the opening of the table, the shearographic assembly being selectively moveable to protrude through the opening relative to the table and rotatable about an opening centerline such that it can scan multiple portions of the tire or tire casing disposed on the table from various perspectives; at least two conveyor strips extending parallel to one another and associated with the table, the at least two conveyor strips being sized and positioned on the table such that they do not interfere with visibility of top and bottom sidewall portions of the tire or tire casing disposed on the table relative to the shearographic assembly, the at least two conveyor strips adapted to carry and selectively move the tire or tire casing relative to the machine; an incoming conveyor disposed adjacent the housing and adapted to stage and deliver the tire or tire casing to the at least two conveyor strips; and a centering device disposed along the incoming conveyor, the centering device configured to align tires or tire casings of various diameters in a transverse direction that is perpendicular to a longitudinal direction of travel defined by the at least two strip conveyors, the centering device comprising: two alignment arms, and two linkages pivotally connected at their ends to one another and a respective one of the two alignment arms to, together, form an M-shape, wherein a base of the M-shape at the ends of the two arms alignment arms is pivotally connected to a frame of the incoming conveyor, and wherein the two linkages can be placed above or below the path of the tire or tire casing. a sealable enclosure formed within a housing, the sealable enclosure adapted to be selectively subjected to positive gage pressure and/or vacuum when testing a tire or tire casing disposed within the sealable enclosure; a table disposed within the sealable enclosure and connected to a portion of the housing, the table having an opening that is adapted to be aligned with a bead hole of the tire or tire casing disposed on the table; a shearographic assembly connected to the housing and disposed within the sealable enclosure in alignment with the opening of the table, the shearographic assembly being selectively moveable to protrude through the opening relative to the table and rotatable about an opening centerline such that it can scan multiple portions of the tire or tire casing disposed on the table from various perspectives; at least two conveyor strips extending parallel to one another and associated with the table, the at least two conveyor strips being sized and positioned on the table such that they do not interfere with visibility of top and bottom sidewall portions of the tire or tire casing disposed on the table relative to the shearographic assembly, the at least two conveyor strips adapted to carry and selectively move the tire or tire casing relative to the machine; an incoming conveyor disposed adjacent the housing and adapted to stage and deliver the tire or tire casing to the at least two conveyor strips; and a centering device disposed along the incoming conveyor, the centering device configured to align tires or tire casings of various diameters in a transverse direction that is perpendicular to a longitudinal direction of travel defined by the at least two strip conveyors, the centering device comprising: two alignment arms, and two linkages pivotally connected at their ends to one another and a respective one of the two alignment arms to, together, form an M-shape, wherein a base of the M-shape at the ends of the two arms alignment arms is pivotally connected to a frame of the incoming conveyor, and wherein the two linkages can be placed above or below the path of the tire or tire casing. two alignment arms, and two linkages pivotally connected at their ends to one another and a respective one of the two alignment arms to, together, form an M-shape, wherein a base of the M-shape at the ends of the two arms alignment arms is pivotally connected to a frame of the incoming conveyor, and wherein the two linkages can be placed above or below the path of the tire or tire casing.