Spindle-Orientation; Spindle Orientation With Module 9171; Spindle Orientation With Marker M2712; Sequence Of Spindle Orientation With Marker M2712 Or Module 9171 - HEIDENHAIN TNC 415 Technical Manual

4.3 Spindle-orientation

In order to use the TNC on machines with automatic tool-changers an orientation of the main spindle
(S-axis) is necessary. This requires a controllable spindle. The orientation is carried out by a
miscellaneous function M19 or another M-function, and must be initiated by the PLC-program. The
spindle orientation functions asynchronously to the NC positioning movements. The PLC must not
acknowledge the oriented stop until M2007 is set. MP3010 determines whether the control
operates with or without spindle-orientation (see Section 4, "Main spindle").
There are three ways in which the PLC can orient the spindle:
•
with Module 9171
•
with Marker M2712
•
through initiator with M2501

Spindle orientation with Module 9171

Module 9171 makes it possible to define the velocity, angle and the direction of rotation for spindle
orientation. Marker M2712 is set as long as the spindle is being oriented. See the description of
Module 9171 in the "PLC-Programming" chapter.

Spindle orientation with Marker M2712

If spindle orientation is activated with M2712, the nominal position is taken from D592. The nominal
position is based on the reference point and can, for example, be set in machine parameter
MP4210.x. It must be copied into the Doubleword D592. The nominal position can also be take from
the "Orientation" cycle (CYCL DEF 13). In this case, MSB of D592 = 1 and the other bits are set to 0.
This must be realized through the PLC program. Marker M2408 is set during execution of Cycle 13.
The speed of spindle orientation is taken from MP3520.1.
For the orientation of a stationary spindle, the direction is taken that has the shortest path to the
stop position, provided that at the start the distance between the nominal and actual positions is not
greater than the positioning window (MP3420). If the distance is greater than the positioning
window, the spindle will be positioned according to Marker M2656 with M03 or M04.

Sequence of spindle orientation with Marker M2712 or Module 9171

The spindle speed is reduced along the ramp from MP3410.1 to the speed for spindle orientation.
Once this speed has been reached the spindle is in the control loop and is oriented to the nominal
position along the ramp from MP3410.1.
If the spindle does not have to remain in the control loop after reaching the nominal position, marker
M2499 must be set. The spindle is not free of the control loop until this marker has been set. If
M2499 remains set, the control loop is opened after each orientation as soon as the positioning
window is reached.
The spindle can be oriented down to 0.1 degree. This value results from the line number of the
installed rotary encoder (ROD 426.xxx8 with 1024 lines) and the 4-fold evaluation in the TNC. A
positioning window is defined with MP3420. Marker M2007 is set once the spindle is in the
positioning window after orientation.
Machine parameter MP3430 was introduced to make it possible to easily compensate rotary
encoder misalignment resulting from imprecise mounting. The offset of the nominal and actual
position of the reference mark is entered here for compensation during spindle orientation.
The reference mark is immediately evaluated by the NC the first time the spindle is switched on.
The reference mark can be evaluated once again for special applications if Marker M2615 is set.
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