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Accurate axis slides

Each guide rail of this metal cutting machine is fitted with a stainless-steel measurement tape marked with grooves on a millimeter pitch. A reading head on the slide excites the primary of an inductive measurement sensor. The steel tape modifies and reflects the induced magnetic field back to the secondary side of the reading head sensor.

Measurement systems integrated into the guide rail components of metal cutting machines withstand dust, swarf, and cooling oil.

Output is an analog sine wave and cosine wave whose signal amplitudes vary with slide movement. The signal wavelength of 1,000 microns corresponds to the millimeter pitch on the steel tape. An interpolation unit in the electronics divides up the measured millimeter, producing a resolution down to 0.25 microns.

Patrick Scott, Rexroth Star; 14001 South Lakes Dr., Charlotte, NC 28273; Tel: (800) 438- 5983; E-mail: info@starliner.com .  

Benchless lathe

One to three identical columns, positioned around a central spindle, define this turning machine's unorthodox configuration. System layout, however, permits simultaneous production operations—only possible until now on multiple-spindle lathes. In addition, maintenance is easy since the open structure is accessible from all angles.

Each column can hold a standard cutting tool, robot, or tailstock. A three-lobed design, optimized with SolidWorks software, distributes stress for machine stability.

Hydrostatic bearing blocks support both Z and X axes for excellent damping, rigidity, and accuracy. A permanent magnet synchronous motor from Parvex SA (see Global Design News, September 1998) forms the electric spindle. No currents in the rotor and no iron losses in the rotor laminations ensure low spindle temperatures.

Highly rigid, the design can be used for machining parts after heat treatment. Other system benefits include few components, standardized modules, and interchangeable elements.

J. M. Delacou, ACCIM, Tel: +33 2 51 91 88 70; Fax: +33 2 51 91 88 71; E-mail: info@accim.fr .

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