Machine Repair Procedure: Turret Zero Return Method for Mori Seiki Lathes (Servo-driven Turret Type) with Fanuc CNC Control
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In the event that you need to adjust (or have lost) the turret zero-return position on a Mori Seiki lathe with a servo-driven turret, you will find the follwing information useful. Adjustment may be needed after a crash involving the turret. If the turret is unclamped an rotating when the turret strike occurs, it would be likely that you would need to adjust the turret zero point. Also, if you have a dead battery for the encoder or have disconnected the encoder cable from the motor during other work, you might find that the machine will display an alarm “300: nth Axis Needs Zero Return”. Generally, you will find at this point that the parameter 1815.4 for the turret axis has changed to a “0″.
This procedure applies to the following Mori Seiki lathes:
SL-150
SL200
SL-250
SL-300
SL-400
DL-15
DL-150
DL-150Y
SL-153SY
1. Remove all tool holders from the turret.
2. Turn on Parameter Write Enable (PWE). Set parameter # 1815.4 for the turret axis only to “0″ (if it isn’t a “0″ already).
The turret axis may be 3,4, or 5, depending on the model of the machine.
SL-XXX (3-digit model, no live-tool)
1815
X
Z
3-Turret
SL-XXXMC (3-digit model, with live-tool)
1815
X
Z
C-Spindle index
4- Turret
A- Milling
SL-150SMC (3-digit model, with live-tool, with sub-spindle)
1815
X
Z
C- Spindle index
B- Sub-spindle axis
5- Turret
A- Milling
DL-15, 150
1815 (Head #1, Head#2)
X
Z
B-Turret
DL15MC
1815 (Head #1, Head #2)
X
Z
C- Spindle index
B- Turret
A- Milling
DL-15Y, DL-150Y, SL-153SY
These machines are using Fanuc’s “Loader Control” function to control the turret. To gain access to this function, select Head #1 then press [Shift] and [Help] keys at the same time. You should see the letters “LC” at the bottom RH corner of the screen display. To clear this function, power off/ on.
(In the LC mode)
1815
X- Head #1 Turret
Z- Head #2 Turret
3. Set NC parameter 3115 for the turret axis to a “0″. This will activate the position display for the turret axis.
4. Acivate the “Field Adjustment Mode” by holding in the [Feed Hold] button and turning the panel edit key right from center vertical position to the right horizontal, then back to the left vertical position. You should see the red l.e.d. above the feed-hold button begin flashing. On DL machines, be sure that you are in Head#1.
5. Press the [Custom] button. Press [9][5] then [Input].
6. Display the parameter D148.5 by typing [1][4][8][.][5] [Input]. Key in [1] then press the [Exec] soft-key under the screen.
D148.5
“0″: Turret adjustment mode is not effective
“1″: Turret adjustment mode is effective
7. Display the parameter D149.1 by typing [1][4][9][.][1] [Input]. Key in [1] then press the [Exec] soft-key under the screen.
D149.1
“0″: Axis movement is possible only when the turret is clamped
“1″: Axis movement is possible even if the turret is unclamped
8. Note: for turret with milling (live-tool), set D149.6 to a “1″ while in the Field Adjustment Mode.
D149.6
“0″: Rotory tool interlock is valid
“1″: Rotory tool interlock is invalid
9. At this point, you will be able to clamp and unclamp the turret using the turret station select buttons on either side of the turret manual index button. Press the turret manual index UP button to unclamp the turret. You should hear this when it happens.
10. Next we need to be able to move the turret using the handwheel. Select the handle mode and set the multiplier to “100″. You will now see that when you select the axis to move with the hand-wheel, you now have a choice “T”. This is displayed only when you are in the turret adjustment mode. This is the turret axis selection. On machines that have a rotory switch for axis selection, set the switch to “Z”, be in Head#1, have D148.5 set to “1″, and have the turret unclamped. The turret will move using the handwheel.
11. Quickly move the turret several station using the handwheel.
Note: The Fanuc serial absolute encoder software must be initialized before it can issue a valid “marker pulse” to the CNC. As a result, the first time the encoder is powered on after it has lost its memory, the encoder must be initialized before attempting the zero-return sequence. If this is not done, you may see the following alarms:
309 n Axis ZRN Impossible
or more typically
090 Zero Return Incomplete
If the turret does not move at all in response to step# 9, it is probably due to the turret axis being interlocked. On “Y”, “MC”, “S” or “SMC” model machines, the turret will not move unless the milling spindle is oriented. To permit this, you can set D149.6 to a “1″ to cancel the interlock. However, DO NOT DO THIS UNTILL ALL THE MILLING TOOLS ARE REMOVED FROM THE TURRET. If you don’t, you may rotate the milling tools into the mill driver, causing further damage.
12. Rotate the turret clockwise until station #1 is as close as possible to the cutting position. You can use a dial indicator at a station that is parallel with the X axis to verify this. The X axis will still move with the handwheel also. When you find the position, mark the turret in relation to a non-rotating point with a marker or paint pen. This will be very helpful if the procedure does not work for some reason and you have to start over. Also, select the “Relative” position display and origin the turret axis for the next step.
13. Rotate the turret counter-clockwise by 5 dgrees according to the relative position display.
14. Select the ZRN mode on the operation panel, then press and hold the turret manual index button.
15. The turret will rotate and stop at the new zero point. Check that NC parameter 1815.4 for the turret axis is now a “1″. The turret will not clamp yet. Leave it unclamped for now.
16. Origin the turret axis relative position again. Indicate the O.D. tool slot on the turret face that is at the cutting position. If the grid-shift parameter for the turret axis is correct (parameter 1850) the slot will be parallel with the X axis movement of the turret and the indicator will not move. If the slot is not parallel with the X axis movement, select the Handle mode. Set the multiplier to “1″ and rotate the turret until the slot is parallel. Note the current relative position display for the turret axis. You will need to calculate a change of the grid-shift parameter for the turret axis. This is done as follows:
Example: if the relative position is “000.186″ mm:
For SL series machine: 000.186 x 5000= 930
For DL series machines: 000.186 x 1000= 186
Therefore, “930″ or “186″ would be the amount of the change to the current setting of the grid-shift parameter 1850. Note: These are the amount by which you will change the current setting, not the actual numbers that you would set for the grid-shift parameter. Add or subtract based on which direction you need to move.
19. After changing the grid-shift, you will get an alarm “000 Power Must Be Off”. This is normal. Power off the control, wait approximately 15 seconds then power back on. You will have to repeat step#4 through step# 15.
20. When you complete step# 15 and the turret stop point (the new zero point) is parallel with the turning tool pocket at the cutting position, you can press the manual turret index station select DOWN button. The turret will clamp. You should hear this happen also. Watch the turret when it clamps. If you see rotation as the clamping takes place, you either need further adjustment of the grid-shift or the mechanical alignment of the turret is off.
21. If the turret does not move when clamping, adjustments are complete. Set NC parameter 3115.0 for the turret axis back to a “1″.
22. Press the E-stop button. This will automatically set all turret adjustments parameters back to “0″.
23. Check D151.2 (Turret OK Memory) is now a “1″. If it is not, you will have to set D126.0 (Memory Parameter Change OK) to a “1″ to be able to change the state of D152.2. After setting D151.2 to a “1″, set D126.0 back to a “0″.
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