WAHLI machining centres from Swit zerland are high precision machining centres with advanced features. There are a number of models already in use in New Machine Tools the aerospace industry — in this country with British Aerospace, and overseas with the Thomson Group, for the Aerospace MBB, Dassault, Pratt and Whitney and Aerospaciale. Now Wahli have introduced a new, Industry high accuracy horizontal machining centre to the range — the Wahli 53. A novel feature of this machine is its twin spindle design for machining two com ponents at once for high productivity (the machine is also available as a single More than half the Wahli machines They are particularly suited to tool spindle version). sold have been for integration into room and small batch production work As with other Wahli machines, the machining cells, the majority of them because they offer the capability of W53 is built to machine to very high incorporating these advanced features. combining manual operation with CNC accuracies, with AC axis drives and a control in combinations to suit the direct measuring system using glass particular application, thus reducing set Fehlmann precision drilling boring scales. up time to a minimum. and milling machine The standard version includes a 4th Fehlmann precision drilling, boring and The latest machine to be introduced rotary axis under CNC control, with a milling machines from Switzerland are to the range is the Picomax 51 DC. The circular encoder for high precision in use with British Aerospace, Flugzeug- main feature of the new machine is the component positioning and movement. werke Pilatus and the Thomson Group DC spindle drive offering a speed range A very rigid pallet changing system is among others. from 50 to 9200 rpm from a 4 kW also fitted as standard. A 5th axis under motor. Up to six speeds can be pre CNC control can be included as an selected and called up by means of a option if required. push button. The machine is equipped The X, Y and Z travels are 700, 500 with spindle orientation. and 700 mm respectively. The pallet The Picomax 51 DC is designed dimensions are 500 x 500 mm (630 x especially for high precision tool room, 500 mm as an option). prototype and short order work, where The spindle motor is 10 kW. Standard minimum set up time and high accuracy spindle speed range is 40 to 7000 rpm are important. giving a maximum torque of 160 Nm. Positioning of the co-ordinate table is An optional low speed range of 40 to manual via hardened and ground lead 4600 rpm is available, giving a maximum screws giving a positional accuracy torque of 240 Nm. within 0.01 mm and repeatability within Single or duplex tool magazines are 0.002mm. A 'Visulesta 3' VDU gives a provided which can be used on either read out of the X, Y, and Z axes, the single or twin spindle machine, with positioning in increments of 5 μm, capacities from 24 up to 192 tools. Tool ensuring machining to jig boring accur change speed is programmable according acy, with 50 sets of stored co-ordinates to the weight of the tool. and optional graphics. Control is either the Fanuc 15MA, There is a range of 6 automatic Siemens 880 or NUM 760. vertical spindle feed rates from 0.02 to The machine can be integrated initially 0.32 mm per revolution. For larger or retrospectively with rotary or linear batch work, depths can be set on the 8 palletised storage systems. Loading and position rotary stops. The self locking unloading of components can be by fine feed on the Z axis enables milling independant handling systems such as operations to be undertaken. gantry loaders or robots. This is made The machine is fitted with the possible through the use of hydraulically standard Fehlmann manual quick change actuated fixtures which can be mounted tool system. A spindle head positioning on the standard machining centre pallets. device makes it possible to select three This flexibility of component handling different heights to accommodate various enables integration with post process tool lengths and workpiece heights up to washing stations and with gauging 560 mm spindle nose to table. Clamping stations with dimensional feed back. of the spindle head is automatic. Integration with cell management and networking management computers Umak Ltd, Group House, Macka- is available as a further extension to the down Lane, Birmingham B33 0LQ. machine's contemporary specification. Tel: 021-783 1414. AIRCRAFT ENGINEERING — August 1989 25
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Aug 1, 1989
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