21
ETM–949 | ETM–949EVS
10. Check for correct operation using the coarse feed
handle. If operating correctly, start the drive motor
and engage the power feed mechanism. Verify that
the power feed lever correctly engages and disengag-
es when driven by the drive motor.
10.6 TABLE LEAD SCREW BACKLASH
ADJUSTMENT
Refer to Figure 24.
The milling machine table is moved by a lead screw and
nut for each machine axis. For proper operation, there
must be clearance between the lead screw and the nut,
which results in backlash. A second lead screw nut is
provided to eliminate most of the backlash. The following
procedures provide instructions for obtaining acceptable
backlash.
Cross Feed Backlash Adjustment:
1. Use the cross feed crank to move the table to the
extreme rear of its travel.
2. Remove the pleated way cover.
3. Open the two chip guards enough to expose the
cross-feed adjustment nut (the nut that is toward the
rear of the nut bracket is not adjustable – only the front
nut is adjustable).
4. Loosen the two nut locking screws.
5. Turn the nut slightly to tighten it against the opposing
nut.
6. Tighten the two nut locking screws.
7. Using the cross-feed crank, move the table to the
middle position.
8. Set up a dial indicator to check cross-feed backlash.
Gently move the cross feed crank back and forth while
watching the dial indicator. Backlash should be be-
tween 0.003 inch and 0.005 inch.
9. If necessary, repeat the steps above to set backlash.
10. Install the pleated way cover.
Longitudinal Backlash Adjustment:
Refer to Figure 24.
1. Only one of the longitudinal lead screw nuts can be
adjusted. The other nut is fixed. The left hand nut is
typically adjustable. This can be determined by
looking at the nut from the underside of the table.
2. Loosen the two nut locking screws.
3. Turn the nut slightly to tighten it against the opposing
nut.
4. Tighten the two nut locking screws.
5. Using the longitudinal table crank, move the table to
the middle position.
6. Set up a dial indicator to check longitudinal backlash.
Gently move the crank back and forth while watching
the dial indicator. The backlash should be between
0.003 inch and 0.005 inch.
If necessary, repeat the steps above to set backlash.
Fig. 24
Table Lead Screw Components
Feed nut - end view
Cross-feed section view
Longitudinal feed section view
Slots allow adjustment
of thread tightness
Lock Screws
Threads in bore
accept lead screw
Leadscrew nut set
Knee
Casting
Graduated dial
Dial holder
Bearing retainer ring
Bearing
Bracket
Adjustable
nut
Rollpin
Sealed ball
bearings
Right bearing bracket
Bearing
retaining ring
Bearing bracket
cap screws
Longitudinal
lead screw nut set
Adjustable
nut
Left bearing bracket
Dial
lock
ring
Graduated
dial
Shim(s)
Dial holder
Nut bracket
(same part as cross-feed
section view)
Nut bracket
(same part as longitudinal
feed section view)
Summary of Contents for ETM-949
Page 9: ...9 ETM 949 ETM 949EVS Fig 2 ETM 949 DIMENSIONS ...
Page 12: ...12 MILL Fig 5 Fig 4 Motor Switch ...
Page 25: ...25 ETM 949 ETM 949EVS TABLE ASSEMBLY ETM 949 ETM 949EVS ...
Page 48: ...48 MILL 14 0 WIRING DIAGRAM ETM 949 ...
Page 49: ...49 ETM 949 ETM 949EVS WIRING DIAGRAM ETM 949EVS E type inverter ...
Page 50: ...50 MILL WIRING DIAGRAM ETM 949EVS B type inverter ...
Page 51: ...51 ETM 949 ETM 949EVS NOTES ...
Page 52: ...52 MILL NOTES ...