
Fundamentals, file management
3.1
Fundamentals
3
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HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
3.1
Fundamentals
Position encoders and reference marks
The machine axes are equipped with position encoders that
register the positions of the machine table or tool. Linear axes are
usually equipped with linear encoders, rotary tables and tilting axes
with angle encoders.
When a machine axis moves, the corresponding position encoder
generates an electrical signal. The TNC evaluates this signal and
calculates the precise actual position of the machine axis.
If there is a power interruption, the calculated position will no
longer correspond to the actual position of the machine slide.
To recover this association, incremental position encoders are
provided with reference marks. The scales of the position encoders
contain one or more reference marks that transmit a signal to the
TNC when they are crossed over. From that signal the TNC can
re-establish the assignment of displayed positions to machine
positions. For linear encoders with distance-coded reference
marks, the machine axes need to move by no more than 20 mm,
for angle encoders by no more than 20°.
With absolute encoders, an absolute position value is transmitted
to the control immediately upon switch-on. In this way the
assignment of the actual position to the machine slide position is
re-established directly after switch-on.
Summary of Contents for TNC 620 Programming Station
Page 4: ......
Page 5: ...Fundamentals ...
Page 28: ...Contents 28 HEIDENHAIN TNC 620 ISO Programming User s Manual 9 2016 ...
Page 57: ...1 First Steps with the TNC 620 ...
Page 77: ...2 Introduction ...
Page 110: ......
Page 111: ...3 Fundamentals file management ...
Page 166: ......
Page 167: ...4 Programming aids ...
Page 194: ......
Page 195: ...5 Tools ...
Page 234: ......
Page 235: ...6 Programming contours ...
Page 284: ......
Page 285: ...7 Data transfer from CAD files ...
Page 304: ......
Page 305: ...8 Subprograms and program section repeats ...
Page 323: ...9 Programming Q parameters ...
Page 384: ......
Page 385: ...10 Miscellaneous functions ...
Page 407: ...11 Special functions ...
Page 433: ...12 Multiple axis machining ...
Page 475: ...13 Pallet management ...
Page 480: ......
Page 481: ...14 Manual Operation and Setup ...
Page 549: ...15 Positioning with Manual Data Input ...
Page 554: ......
Page 555: ...16 Test Run and Program Run ...
Page 590: ......
Page 591: ...17 MOD Functions ...
Page 622: ......
Page 623: ...18 Tables and Overviews ...