Makino V55, Руководство по обслуживанию

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7.10.1.1 Measurement of Axis Backlash
This procedure is used to measure an axis' backlash. Measure backlash
at three points along the axis, then use an average of these measure-
ments as the backlash amount.
If the backlash check readings are high (0.02mm (0.0008")), inspect the
entire feed mechanism for possible mechanical failures. Check the: guide
ways for wear and proper lubrication; ball screw and support bearings for
wear and proper lubrication; ball screw pre-tension.
Before starting this procedure, set the backlash amount in
CNC
parameter
1851 (for the axis being measured) to zero. See
section 7.11
for the proce-
dure to set parameter 1851.
This procedure is for measure-
ment along the X axis. Y and Z
axes are measured in a similar
manner.
1. Mount a magnetic base and
0.002mm or 0.0001"
indicator on the table.
2. In HANDLE mode, move the
X, Y, and Z axes so the
spindle nose contacts the
indicator stylus. Position 1 in
Figure 7-41
.
- Indicate against the spindle end cap and not against the spindle
cooling jacket.
3. Using the MPG, move the axis to position 1 to load the indicator and
set it to zero. Load the indicator in the same direction of axis travel
used in Step
2.
- While performing this step, do NOT change the direction of axis
travel, as this will produce a false backlash reading.
4. Set the Rapid-Traverse rate to 100%.
5. In MDI, command an incremental move of 0.5mm (0.020"), further
loading the indicator (move from position 1 to position 2).
- Key-in: G21 G91 X–.5,
[EOB
],
[INSERT],
and press Cycle
[START].
6. Command the same distance move in the opposite direction (from
position 2 back to position 1).
- Key-in: G21 G91 X.5,
[EOB
],
[INSERT],
and press Cycle
[START].
F
IGURE
7-41
BACKLASH MEASURE
-
MENT
(X
SHOWN
)