XYZ Machine Tools' VMCs can now feature Lehmann 4th and 5th axis machining

Being modular and using Lehmann's CombiFlex system of build, more than 20 different methods of component clamping can be applied, as standard, in conjunction with manual or power-operated devices. As a result, restrictions caused by normal faceplates, chuck jaw and clamping areas of other systems are overcome. The three models - EA507, EA510, EA520, have a clamping torques of 300, 800 and 2,000 Nm, respectively, with an indexing accuracy of 20, 17 and 12 arc-secs. The weight of each unit is 22 kg, 35 kg and 70 kg, respectively, and they able to support workloads of 240 kg, 400 kg and 800 kg, respectively. And the Lehman units unit can achieve 180° positioning within 0.5 secs – half the time rating of competitor units. Lehmann has specialised in NC tables and positioning equipment for over 35 years, during which time more than 10,000 units have been installed. The compact design of the EA 500 series of three units has the rigidity of a cast iron base, with hard chrome plated gear unit housing and an anodised aluminium cover to prevent damage from the likes of swarf and coolant in the machining area. The compact dimensions of each unit also means machine table area and Z-axis stroke are not compromised. The gear-based indexing mechanism can be fine-tuned for backlash, if required during service life, through radial adjustment of the worm. Also, the use of quadruple precision bearings provides maximum radial support against thrust generated, particularly when drilling off-centre. Internal radial spindle clamping is on the maximum diameter, with integrated pressure intensifier and pressure sensors that create a clamping factor between 300 and 4,500 Nm, a factor 10 times that of competitive products. This eliminates any axial displacement of the spindle and loading against the spindle bearing. Built-in intelligence displays history and speed, monitors internal pressure, temperature, moisture, shock and clamping data.