Stepped collet

An arbor comprising:

• a body including a mandrel portion;
• a bladder circumscribing at least part of the mandrel portion of the body;
• a radially expandable sleeve circumscribing at least part of the bladder and including a plurality of circumferentially spaced and longitudinally extending displacement reliefs;
• a collet body having an axis, an inboard section having a first end and a generally axially spaced-apart second end, and an onboard second section projecting axially outward of the second end of the inboard section,
• the inboard section being generally hollow and including an outer surface, and an inner surface configured to receive a radially outward force moving at least part of the inboard section radially outward;
• a wall extending radially inwardly from adjacent the second end of the hollow inboard section;
• the outboard section cantilevered from the wall, extending generally parallel with the hollow inboard section, being generally split and including an outer surface to cooperate with a workpiece, and the outer surface of the outboard section having a diameter smaller than the diameter of the outer surface of the inboard section;
• a plurality of circumferentially spaced apart first slots radially extending through the outboard section, the wall and at least part of the inboard section and longitudinally extending through the outboard section, the wall and only part of the inboard section;
• a plurality second slots radially extending through the inboard section and the wall and longitudinally extending through the inboard section and the wall but not the outboard section;
• and
• the sleeve is received between the bladder and inboard section and underlying at least the portion of each of the slots in the inboard section overlying the bladder.

A collet comprising:

• a collet body having an axis, an inboard section having a first end and a generally axially spaced-apart second end, and an outboard section projecting axially outward of the second end of the inboard section,
• the inboard section axially extending along the axis and being of generally hollow cylindrical shape and including an outer surface, and an inner surface configured to received a radially outward force moving at least part of the outer surface radially outward;
• a wall extending radially inwardly from adjacent the second end of the inboard section;
• the outboard section extending axially outwardly from the wall and being of generally split cylindrical shape and including an outer surface to cooperate with a workpiece;
• a first set of displacement reliefs including a first plurality of circumferentially spaced slots radially extending through at least portions of the inboard and outboard sections and axially extending from an outer end of the outboard section through the outboard section, the wall and through at least a portion of the inboard section;
• a second set of displacement reliefs circumferentially interdigitated with respect to the first set of displacement reliefs and including a second plurality of circumferentially spaced slots radially extending through at least a portion of the wall and through at least a portion of the inboard section to the outer surface thereof and axially extending from an outer end of the wall through at least a portion of the inboard section;
• a first set of holes extending generally axially through the wall;
• and
• a second set of holes extending generally axially through the inboard section;
• wherein the first set of displacement reliefs also includes first subsets of the first and second sets of holes wherein the first plurality of circumferentially spaced slots extends through the first subsets, and the second set of displacement reliefs also includes second subsets of the first and second sets of holes wherein the second plurality of circumferentially spaced slots extends from the second subset of the first set of holes and through the second subset of the second set of holes.