MACHINE ELEMENT ALIGNMENT POSITIONER

A compact portable positioner includes a movable table on a main body with ball bearing means between the table and the body for allowing precise transverse and/or longitudinal movement in the horizontal plane. Lifting means support the main body to provide the third dimensional adjustment so that movement of the table in either plane does not upset previous adjustment. The ball bearing means comprises a plurality of balls held captive by an apertured plate means held in a frame of suitable resilient material, such as polyethylene foam. The frame is attached to the table and the body to provide biasing means for urging the table to the home position. Adjusting and fixing means in the horizontal plane preferably includes opposed jackscrews and may include nonparallel vertical cam surfaces and jackscrews having frusto-conical terminal ends. The lifting means may be mechanical screws resting on indented bearing plates, or alternatively hydraulic lift cylinders with a control circuit having check valves and bypasses to effect operation.