HEIDENHAIN TNC 335 Technical Manual - Manual (Page 47)

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TNC 360 5 Encoders 3-19
5 Encoders
The HEIDENHAIN contouring controls are designed for the installation of incremental linear and
angular encoders.
The control controls the actual position with a measuring step of 0.001 mm or 0.001°. Encoders with
a graduation period of 0.001 mm or 0.001° to 1 mm or 1° may be used.
It does not matter whether the encoder or encoder has one or several reference marks.
However, HEIDENHAIN recommends the use of encoders with distance-coded reference marks,
since the traversing distance when homing on the reference marks is thereby reduced to a
minimum. See chapter "Machine Integration."
5.1 Linear encoders
Measurement of length is best performed by a linear encoder. Insofar as it is compatible with the
accuracy requirements, linear measurement can also be made using a rotary encoder on the
ballscrew.
HEIDENHAIN recommends use of the following linear encoders:
LS 103 C, LS 106 C, LS 405 C, LS 406 C, LS 706 C, LB 326, ULS 300 C.
For linear measurement with the aid of a rotary encoder and a ballscrew you could use, for example,
an ROD 450.
5.2 Angle encoders
For direct angular measurement in the A, B or C axes the following incremental angle encoders are
available: ROD 250 C, ROD 700 C, RON 255 C, and RON 705 C.
In order to meet accuracy requirements, HEIDENHAIN recommends line counts of at least 18 000.