Floating adjusting device for light-load working condition

The invention discloses a light-load working condition floating adjusting device which comprises an adjustable receiving disc and a three-jaw chuck which are axially connected, the adjustable receiving disc is elastically connected with the three-jaw chuck, and a cam mechanism used for adjusting the three-jaw chuck is arranged on the adjustable receiving disc. The cam mechanisms are arranged at the positions, away from the axis, of the adjustable receiving disc, axial or radial run-out of parts on the three-jaw chuck can be corrected through simultaneous rotation of the cam mechanisms or rotation of part of the cam mechanisms, and adjustment operation is convenient and rapid; a lever dial indicator is matched, so that a clamped part can be accurately and reliably adjusted in the axial direction and the radial direction; the size of the rotatable adjusting block can be changed according to different conditions so as to change the adjustable quantity; through the combined use of the supporting force spring and