HEIDENHAIN iTNC 530 Service Manual page 414

Touch probe with signal transmission via cable (e.g. TS 220)
Various styli can be inserted into the touch probes. The styli feature a rated break point.
Touch probe for tool measurement (e.g. TT 140)
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The machine operator inserts the touch probes by hand into the spindle.
They serve to align workpieces, set datums and calibrate workpieces.
Power supply and signal transmission via the cable.
This touch probe is used to measure tools (length, radius, individual teeth).
Tools can be examined for breakage.
Tool wear can be determined.
HEIDENHAIN Service Manual iTNC 530