Exposed Linear Encoders - DR. JOHANNES HEIDENHAIN GmbH - #2

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Exposed Linear Encoders Linear encoders measure the position of linear axes without additional mechanical transfer elements. This eliminates a number of potential error sources: • Positioning error due to thermal behavior of the recirculating ball screw • Reversal error • Kinematic error through ball-screw pitch error Linear encoders are therefore indispensable for machines that must fulfi ll high requirements for positioning accuracy and machining speed. Exposed linear encoders are designed for use on machines and installations that require especially high accuracy of the measured value. Typical applications include: • Measuring and production equipment in the semiconductor industry • PCB assembly machines • Ultra-precision machines such as diamond lathes for optical components, facing lathes for magnetic storage disks, and grinding machines for ferrite components • High-accuracy machine tools • Measuring machines and comparators, measuring microscopes, and other precision measuring devices • Direct drives Mechanical design Exposed linear encoders consist of a scale or scale tape and a scanning head that operate without mechanical contact. The scale of an exposed linear encoder is fastened directly to a mounting surface. The fl atness of the mounting surface is therefore a prerequisite for high accuracy of the encoder. Information on • Absolute Angle Encoders with Optimized Scanning • Angle Encoders with Integral Bearing • Angle Encoders without Integral Bearing • Magnetic Modular Encoders • Rotary Encoders • Encoders for Servo Drives • Linear Encoders for Numerically Controlled Machine Tools • Interface Electronics • HEIDENHAIN Controls is available on request as well as on the Internet at www.heidenhain.de This catalog supersedes all previous editions, which thereby become invalid. The basis for ordering from HEIDENHAIN is always the catalog edition valid when the contract is made. Standards (ISO, EN, etc.) apply only where explicitly stated in the catalog.