HEIDENHAIN ND 287 User Manual - Manual (Page 79)

ND 287
79
II – 2 Installation Set
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Error compensation
The distance a cutting tool travels, measured by an encoder, can in
certain cases, differ from the actual tool travel. This error can occur
due to ball screw pitch error or deflection and tilting of axes.
This error can either be linear or non-linear. You can determine these
errors with a reference measurement system, e.g. the VM 101 from
HEIDENHAIN. From an analysis of the error it can be determined
which form of compensation is required (linear or non-linear).
The ND 287 can compensate these errors. Each axis can be
programmed separately with the appropriate compensation.
The ND can also compensate errors caused by temperature
influences
. A linear encoder must be connected to input X1, and an
analog module (option) with a temperature sensor must be connected
to input X2.
Only non-linear error compensation is available when
using rotary encoders.