Heidenhain - Magnetic Modular Encoders

The robust ERM magnetic modular encoders are especially suited for use in production machines. Due to their large inside diameters as well as the small dimensions and compact design of the scanning head they are highly suitable for:

The C-axis of lathes
Spindle orientation on milling machines
Auxiliary axes
Integration into gear stages

The signal period of approximately 400µm, and the special MAGNODUR procedure for applying the grating, achieve the accuracies and shaft speeds required by these applications.

Accuracy
C axes on lathes is typically used for the machining of bar-stock material. Here the graduation of the ERM modular encoder is usually on a diameter that is twice as large as the work-piece to be machined. The accuracy and reproducibility of the ERM also achieve sufficient work-piece accuracies for milling operations with lathes (classical C-axis machining).

Measuring standard
HEIDENHAIN encoders incorporate measuring standards of periodic structures known as graduations. Magnetic encoders use a graduation carrier of a 'magnetisable' steel alloy. A 'write' head applies strong local magnetic fields in different directions, so that a graduation consisting of north poles and south poles is formed with a grating period of 400µm (MAGNODUR process). Due to the short distance of effect of electromagnetic interaction, and the very narrow scanning gaps required, finer magnetic graduations are not practical.

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Heidenhain - Magnetic Modular Encoders