Due to increased accuracy demands for angle encoders exceeding an inside diameter of 100 mm, Heidenhain has developed the EIB 1500 External Interface Box. The EIB can be used by OEMs to increase accuracy, or as an upgrade path for current installations in the field by adding extra scanning heads. The EIB 1500 is an interpolation and digitizing electronics unit for digital calculations of two scanning heads which are mounted roughly 180 degrees apart. Ideal for use on rotary tables, stages and tilting axes, this interface box solves the periodic accuracy issues that come with bearings and encoder drum centering on rotary axes.
Specifically, eccentricity and bearing error can be compensated when two 1Vpp position values are averaged and converted to one purely serial signal. The EIB 1500 does this when paired with large hollow-shaft angle encoders without integral bearing. The accuracy of the rotary axis can be improved up to a factor of 3 when an EIB 1500 is paired with HEIDENHAIN’s ERM or ERA angle encoders without bearing.
For more information, visit www.heidenhain.com.