Lathe Z-axis absolute encoder back to reference point - Database & Sql Blog Articles

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Phenomenon: The Z-axis of the lathe is controlled by a 1FT6 motor (the built-in absolute encoder of the motor). The parameter MD34100=755.8 is checked. However, after returning to the reference point on the operation panel, the position of the axis is 1300. According to this phenomenon, the CNC machining program was found. It was found that this command G00Z1300, and the mechanical drawings were additionally checked, and the range of the lead screw stroke was also 800.
Ask: According to my understanding, the axis should be displayed after the reference point is the value of MD34100, which is 755.8, not 1300.

A: The landlord observes the working condition of the machine tool very carefully and should be worth learning! The understanding of the landlord: "The axis should return to the reference point should show the value of MD34100", is correct. In fact, the Z axis of the lathe uses the absolute encoder to return to the reference point. Then, each time the machine is turned on, the zero position of the Z axis is MD34100REFP_SET_POS: the position of the machine coordinate. This value is the position you specify, and it is also in the machine coordinate system. The position of the Z coordinate, ie MCS, is not a position of the Z axis in the workpiece coordinate system - WCS.
The reason why the axis is displayed on the panel is 1300. This value is a value in the workpiece coordinate system of the Z coordinate of the machine. The G54 of the Z axis should be 1300-755.8=544.2. If you switch the coordinate system to WCS, It will be found that the zero return at this time shows the value 755.8 defined by MD34100.

By the way, for the absolute value encoder, the following steps are strictly followed when adjusting the reference position of the coordinate motor:
1. Set machine parameters:
30240ENC_TYPE- is set to 4, indicating the encoder feedback type (note that the activation condition is PO, that is, the power-on is effective)
34200ENC_REFP_MODE- is set to 0, indicating the absolute encoder position setting (note that the activation condition is PO, that is, the power-on is effective)
34210ENC_REFP_STATE - set to 0, indicating absolute encoder status: initial
2. Enter the "manual" mode and move the coordinates to a known position.
3. Enter the known position value in the following parameters
34100REFP_SET_POS: Position of machine coordinates
4. Activate the adjustment function of the absolute encoder
34210ENC_REFP_STATE: 1 absolute encoder status: adjustment status
5. Activate the machine parameters: press the reset button on the machine control panel to activate the above set parameters.
6. Enter the reference point mode through the machine control panel
7. Press the direction key in the direction of returning to the reference point, no coordinate moves, but the system automatically sets the following values:
34090REFP_MOVE_DIST_CORR: reference point offset
34210ENC_REFP_STATE-2: Absolute encoder status, indicating that the display position on the screen is set to the position set by MD34100.
At this point, the machine reference point setting is completed, and the adjustment encoder zero is also completed.

The above description can help the landlord understand the absolute encoder back to zero.