Adjustable eccentricity orbital tool

A random orbital sander comprising:

• a housing;
• a motor disposed within the housing, the motor capable of rotating in a first direction and a second direction;
• a drive shaft rotatably driven by the motor about a drive axis;
• a bearing freely rotatable about a bearing axis and disposed parallel to and eccentrically with respect to the drive axis to define an eccentric offset between the bearing axis and the drive axis;
• a sanding platen supported by the bearing, the sanding platen having a planar surface adapted to receive sandpaper;
• an input sleeve interposed between the bearing and the drive shaft and driven by the drive shaft, the input sleeve having an input axis spaced from the drive axis;
• an output sleeve encircling the input sleeve and positioned within and engaging the bearing, the output sleeve being rotatable about the input axis, the output sleeve circumferentially aligned with the input sleeve in order to minimize the height of the sander;
• and
• a stop member cooperating with the output and input sleeves to allow for rotation of the sanding platen while preventing axial movement of the input and output sleeves;
• wherein the output and input sleeves have cooperating surfaces which limit the relative movement of the sleeves, such that rotation of the motor in the first direction causes the cooperating surfaces to engage in a first limit position such that the eccentric offset is at a maximum, resulting in a large eccentric orbit and a maximum stock removal rate, and rotation of the motor in the second direction causes the cooperating surfaces to engage in a second limit position such that the eccentric offset is at a minimum, resulting in a smaller eccentric orbit and a minimum stock removal rate.