Free-floating hydraulic clamping device using expandable arbor

A workholder for securing a work piece by engaging at least one bore contained in said work piece and locating on a second bore of said work piece, said workholder comprising:

• a support platform;
• a bore clamping device mounted to said support platform, said bore clamping device having a cylindrical expandable arbor extending upward from said support platform for positioning in and engaging a bore of the work piece, the arbor having a first end and a second end, the first end having a plurality of outwardly extending serrations that are operable to engage a bore in the work piece, the arbor further having a longitudinally extending slot that extends from the second end to a tapered internal section of the first end;
• a wedge positioned within the slot, the wedge having a tapered end portion that engages the tapered section of the slot so as to cause the serrations to move outwardly and engage the bore of the work piece;
• a locator assembly integral with the bore clamping device, the locator assembly having a locator pin extending upwardly from said support platform for positioning within and locating said second bore;
• and
• whereby said locator pin positions said work piece for clamping by said clamping device.

A workholder for securing a work piece by engaging a bore contained in said work piece, said workholder comprising:

• a support platform;
• a bore clamping device mounted to said support platform, said bore clamping device having a cylindrical expandable arbor for engaging said bore,
• the cylindrical expandable arbor having a first end and a second end, the first end having a plurality of outwardly extending protrusions that engage the bore in the work piece, the arbor further having a slot with a tapered internal section;
• a wedge positioned within the slot, the wedge having a tapered end portion that engages the tapered internal section of the slot;
• and
• a hydraulic cylinder for selectively activating the arbor and advancing the wedge to a position where the protrusions of the arbor engage the bore of the work piece and the hydraulic cylinder draws the arbor towards the support platform.

A workholder for securing a work piece by engaging a bore contained in said work piece, said workholder comprising:

• a support platform, a cavity located in the support platform;
• at least one spring located in the cavity;
• a clamping device assembly mounted to said support platform, the clamping device assembly having an expandable arbor with an internal slot, a wedge located within the slot, and a support member operable to receive said arbor, the wedge having a pair of wings extending from opposing sides of the slot and protruding from the arbor to engage said spring;
• and
• an actuating device for moving the arbor.