Siemens SINUMERIK 802D sl Manual de servicio descargar pdf (Pagina 29)

Setting-up

4.2 Limit stops

Manual Machine Plus Turning

Programming and Operating Manual, 06/2009, 6FC5398-6CP10-1BA0

4.2.2 Turning against a stop

Example:

The following example explains the operating principle of limit stops using the axis direction

keys.

You can also use the handwheel to perform the machining operation.

Task

The following shoulder with a finishing allowance of 0.2 mm must be turned:

● 100 mm in the Z direction

● 50 mm final diameter in the X direction

The end face starts at 0 mm int he Z direction. The blank diameter is 70 mm.

Operating sequences for infeeding to stop

1. Position the axes in front of the workpiece (e.g., X +75 mm/Z +5 mm).

2. Check the machining technology data.

3. Set the following limit stops:

– -X at 50.4 mm

– -Z at –99.8 mm (due to finishing allowance)

– +Z at +5 mm

4. Delete the limit stop for +X; it is not required.

5. Start the spindle.

6. Using the handwheel, infeed to the 1st depth of cut in the X direction.

7. Start machining in the Z axis in the negative direction using the axis direction switch.

When the limit stop position in Z –99.8 mm is reached, the Z axis stops automatically.

The message "Limit stop –Z reached" is displayed.

8. Switch-out the axis direction switch.

9. Using the handwheel, retract the tool from the workpiece in the X direction.

10. Using the axis direction switch and rapid traverse override, move the tool in a positive Z

direction towards the workpiece until the axis stops.

The message "Limit stop +Z reached" is displayed.

11. Switch-out the axis direction switch.

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Siemens SINUMERIK 802D sl Manual de servicio Pagina 29