Positioning behavior in the definition cycles

General

The cylindrical grinding cycles allow automatic approaching and departing, even in complex machining situations. The cycles approach multiple positions up to the starting point for grinding. During positioning, the cycles modify the active grinding wheel edge.

 
Tip

Modifying the active grinding wheel edge, in turn, affects the position display of the nominal and actual values.

The approach and departure movements depend on the following:

  • Q1058 PRE-POSITIONING MODE:
    • Pre-positioning or no pre-positioning
    • Calculate the inclination angle automatically or use the setting from Q531
  • Q530 INCLINATION BEHAVIOR: MOVE or TURN rotary-axis positioning
  • Q1042 INFEED DIRECTION: outside or inside machining

Approach movement

The approach movement is performed when Cycle 1041 LONG STROKE DEF. or 1042 SHORT STROKE DEF. is called.

If the Z-axis directions of the workpiece coordinate system W-CS and the tool coordinate system T-CS are not parallel, the control will display an error message.

Departure movement

The departure movement is performed when Cycle 1040 END CYLIND. GRINDING is called. The departure movements are the same as the approach movements, but in reverse order.

 
Tip
  • If the NC program is canceled, it is possible to retract the tool from the workpiece with a departure movement in the following situations:
    • Definition cycles 1041 or 1042 were completed with Q1058 PRE-POSITIONING MODE not equal to 0
    • No manual movements performed
    • No transformations modified
  • For this purpose, program Cycle 1040 END CYLIND. GRINDING in the MDI application.

  • After a power interruption, an automatic departure with Cycle 1040 END CYLIND. GRINDING is not possible.

Notes

 
Notice
Danger of collision!
If you program Q1058 PRE-POSITIONING MODE with 0, the control will ignore any safe positions. Q200 SET-UP CLEARANCE, Q260 CLEARANCE HEIGHT, and Q1031 SAFE DIAMETER have no effect. The control moves from the current position directly to the starting point. Risk of collision!
  1. If possible, program Q1058 not equal to 0
  2. Use a simulation to check the machining sequence
 
Notice
Danger of collision!
During the approach and departure movements, the control does not monitor the entire workpiece contour for collisions with the grinding wheel. There is a risk of collision!
  1. Adapt the location on the workpiece in the simulation to the actual machining operation
  2. Use a simulation to check the machining sequence
 
Notice
Danger of collision!
Software limit switches limit the possible inclination angle. If the software limit switches are deactivated in the Editor operating mode in the Simulation workspace, the simulation and the subsequent machining may be different. Risk of collision during machining!
  1. Activate the software limit switches in the simulation

Outside machining with MOVE rotary axis positioning

  1. The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
  2. The control positions the grinding tool with the outermost grinding wheel edge number 2 at the safe diameter Q1031.
  3. The control inclines the grinding tool. The control positions the rotary axes and performs compensation movements in the linear axes. The control determines the center of rotation automatically.
  4. The grinding tool moves in the Z axis to the auxiliary point. The auxiliary point is located at the height of the starting point (i.e., the first reciprocating position).
  5. The grinding tool moves in the X axis to the auxiliary point. The auxiliary point is offset from the starting point by the set-up clearance Q200. If Q200=0, the auxiliary point is located on the X axis at Q1031 SAFE DIAMETER.
  6. Then, the control positions the grinding tool at the starting position.

Outside machining with TURN rotary axis positioning

  1. The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
  2. The control positions the grinding tool with the outermost grinding wheel edge number 2 at the safe diameter Q1031. If the tool is at a position with a value greater than the safe diameter Q1031, it will not be moved.
  3. The control inclines the grinding tool. The control positions the rotary axes only, without performing compensation movements in the linear axes.
  4. If necessary, the control positions the grinding tool at clearance height Q260 again.
  5. If necessary, the control positions the grinding tool at the safe diameter Q1031.
  6. The grinding tool moves in the Z axis to the auxiliary point. The auxiliary point is located at the height of the starting point (i.e., the first reciprocating position).
  7. The grinding tool moves in the X axis to the auxiliary point. The auxiliary point is offset from the starting point by the set-up clearance Q200. If Q200=0, the auxiliary point is located on the X axis at Q1031 SAFE DIAMETER.
  8. Then, the control positions the grinding tool at the starting position.

Inside machining with MOVE rotary axis positioning

  1. The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
  2. The control positions the grinding tool with the outermost grinding wheel edge number 6 at the safe diameter Q1031.
  3. The grinding tool moves in the Z axis to the auxiliary point. The auxiliary point is located at the height of the starting point (i.e., the first reciprocating position).
  4. The grinding tool moves in the X axis to the auxiliary point. The auxiliary point is offset from the starting point by the set-up clearance Q200. If Q200=0, the auxiliary point is located on the X axis at Q1031 SAFE DIAMETER.
  5. The control inclines the grinding tool. The control positions the rotary axes and performs compensation movements in the linear axes. The control determines the center of rotation automatically.
  6. Then, the control positions the grinding tool to the starting position.

Inside machining with TURN rotary axis positioning

  1. The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
  2. The control positions the grinding tool with the outermost grinding wheel edge number 6 at the safe diameter Q1031. If the tool is at a position with a value less than Q1031 SAFE DIAMETER, it will not be moved.
  3. The control inclines the grinding tool. The control positions the rotary axes only, without performing compensation movements in the linear axes.
  4. If necessary, the control positions the grinding tool at clearance height Q260.
  5. The control positions the grinding tool at the safe diameter Q1031.
  6. The grinding tool moves in the Z axis to the auxiliary point. The auxiliary point is located at the height of the starting point (i.e., the first reciprocating position).
  7. The grinding tool moves in the X axis to the auxiliary point. The auxiliary point is offset from the starting point by the set-up clearance Q200. If Q200=0, the auxiliary point is located on the X axis at Q1031 SAFE DIAMETER.
  8. Then, the control positions the grinding tool to the starting position.