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.
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.
- 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
- If possible, program Q1058 not equal to 0
- Use a simulation to check the machining sequence
- Adapt the location on the workpiece in the simulation to the actual machining operation
- Use a simulation to check the machining sequence
- Activate the software limit switches in the simulation
Outside machining with MOVE rotary axis positioning
- The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
- The control positions the grinding tool with the outermost grinding wheel edge number 2 at the safe diameter Q1031.
- 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.
- 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).
- 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.
- Then, the control positions the grinding tool at the starting position.
Outside machining with TURN rotary axis positioning
- The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
- 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.
- The control inclines the grinding tool. The control positions the rotary axes only, without performing compensation movements in the linear axes.
- If necessary, the control positions the grinding tool at clearance height Q260 again.
- If necessary, the control positions the grinding tool at the safe diameter Q1031.
- 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).
- 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.
- Then, the control positions the grinding tool at the starting position.
Inside machining with MOVE rotary axis positioning
- The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
- The control positions the grinding tool with the outermost grinding wheel edge number 6 at the safe diameter Q1031.
- 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).
- 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.
- 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.
- Then, the control positions the grinding tool to the starting position.
Inside machining with TURN rotary axis positioning
- The control positions the grinding tool with grinding wheel edge number 9 at Q260 CLEARANCE HEIGHT.
- 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.
- The control inclines the grinding tool. The control positions the rotary axes only, without performing compensation movements in the linear axes.
- If necessary, the control positions the grinding tool at clearance height Q260.
- The control positions the grinding tool at the safe diameter Q1031.
- 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).
- 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.
- Then, the control positions the grinding tool to the starting position.