HEIDENHAIN TNC 306 Technical Manual - Manual (Page 44)

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TNC 416/TNC 406/TNC 306 Measuring systems 3–29
5 Measuring systems
HEIDENHAIN contouring controls are designed for the installation of incremental linear and angular
measuring systems.
The control measures the actual position with a measuring step of 0.001 mm or 0.001°. Measuring
systems 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 measuring system has one or several reference marks. However,
HEIDENHAIN recommends measuring systems with distance-coded reference marks, since this
reduces the traversing distance when homing on the reference marks to a minimum. See chapter
"Machine Integration."
5.1 Linear measuring systems
Measurement of length is best performed by a linear measuring system. 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 measuring systems:
LS 103 C, LS 106 C, LS 405 C, LS 406 C, LS 706 C, LB 326, ULS 300 C
For linear measurement using a rotary encoder and a ballscrew it would be possible to use, for
example, the ROD 450.
5.2 Angular measuring systems
For direct angular measurement in the A, B or C axes the following incremental angular measuring
systems are available: ROD 250 C, ROD 700 C, RON 255 C, and RON 705 C.
To meet accuracy requirements HEIDENHAIN recommends line counts of at least 18 000.