FLEXIBLE WORKHOLDER FOR AUTOMATED TOOL AND CUTTER GRINDING

Ideal for automated tool and cutter grinding of small batch sizes of all cutting tool types, this workholder clamps diameters between five mm and 20 mm without additional components or time-consuming changeovers, at high repeat accuracies of less than 0.005 mm.

For automated tool and cutter grinding, the unique PRISMO holder from Schunk Inc. (Morristown, NC) can clamp diameters between five mm and 20 mm without additional components or time-consuming changeovers, at high repeat accuracies of less than 0.005 mm. These are ideal conditions for automated manufacturing of small batch sizes of all cutting tool types.

The principle function is based on a precise clamping sleeve with prism guidance. Each of the five chuck jaws are guided by a double prism. A third prism is on the clamping face, which directly contacts the tool shank. The holder always adjusts itself to the individual tool diameter. This is an important difference versus conventional operations where the clamping bore is cylindrically ground. Even deep hole drills and fluted tools can be clamped precisely with the PRISMO. During the clamping operation, the five hardened and coated chuck jaws intermesh. The basic sleeve and the robust design provide a high stiffness to the holder.

The chuck has an overhang length of 2.5 x D with a tool diameter of 20 mm. In order to avoid contamination and to offer permanently high precision, it is rinsed with clean oil during the grinding operation. Regardless of which tool diameter is to be machined, the X-axis of the grinding toolholder remains unchanged. All the chuck jaws actuate on the identical axial position. Time-consuming additional programming and the interference due to incorrect axis offsets are problems of the past.

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