Speedy shark bites into cycle times
Since its recent UK launch, Leader CNC reports that the new Gruppo Parpas Shark machining centre has been causing a stir in the marketplace. The Shark line of high speed, fixed bed and moving column machining centres delivers high precision and speed that generates dynamic performance levels.

The construction of the Shark range is the result of painstaking Finite Element Analysis (FEA) to optimise the frequency and rigidity calculations of the machine base. With a cage-shaped column and central sliding saddle, the Shark has a thermo-symmetric structure that guarantees maximum rigidity and precision over the complete work envelope regardless of machining conditions.
Built upon this base are high quality linear guideways and roller bearings that are said to permit optimum acceleration and accuracy without heat generation. These foundation blocks provide a machining centre that is suitable for machining applications in the aerospace, power generation and mould and die sectors. The machine bed is available with 3, 4 or 5m in the X axis with a Y and Z axes travel of 1200 and 1600mm respectively. The Shark can comfortably machine components in this spacious work area at a rate of 15m/min with a rapid traverse of 35m/min and acceleration/deceleration of 1.5m/min.
The new machine has a variety of rotating spindle heads available to offer the customer full 4th-axis machining capability. The numerous spindle heads that are driven by powerful torque motors can provide continuous and contemporary positioning accuracy of 0.001° throughout a full rotation of 360°. With complete spindle cooling for thermal stability, the Shark series offers spindle speeds up to 7000, 10000, 20000 or 22000rpm. For heavy cutting, the operator can benefit from the high pressure coolant system or a through-tool coolant facility to immediately evacuate swarf from the work envelope.
To maximise material removal rates and rigidity, the Shark is available with a robust BT or HSK spindle taper that can be fed cutting tools from either a laterally positioned stock drum tool carousel with a quick change arm facility or via a chain magazine that can be fixed to the machine moving column. The stock drum is available with 24, 30 or 40 tool positions whilst the larger chain magazine provides 40, 50 or 60 tool stations.
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