96-8100 1-15-96
HAAS AUTOMATION, INC.
TROUBLESHOOTING
SERVICE
MANUAL
VF-SERIES
16
l Ensure the roller bolts on the shuttle of the ATC are tight against the v-guides on the ATC holding arm. If the lower right
roller bolt is loose against the v-guide, the upper right bolt is probably bent. See the following section (ATC Crashing)
or "Roller Bolt Replacement", for roller bolt replacement. NOTE: Bent roller bolts are a symptom of another problem with
the ATC. Repair the bent roller bolt and then isolate the ATC problem.
l Check Parameter 71 against the values that are in the documentation sent with the machine.
l Ensure the balls on the drawbar move freely in the holes in the drawbar when the tool release button is pressed. If they
do not move freely, the ATC will be pushed down about ¼ before the tool holder is seated in the taper, resulting in
damage to the roller bolts on the ATC shuttle. Replace drawbar.
´ Tool holders twist against extractor fork during a tool change.
l Check the alignment of the ATC in the X and Y axes ("Automatic Tool Changer Alignment" section).
´ Tool holders spin at all pockets of the ATC when the ATC shuttle retracts.
l ATC is misaligned in the Y axis. Realign ATC ("Automatic Tool Changer Alignment" section). NOTE: Observe the
direction the tool holder rotates, as this will be the direction in which the Y axis of the ATC needs to be moved.
´ Tool holders spin only at certain pockets of the ATC when the ATC shuttle retracts.
l Check all the extractor forks to ensure they are centered in the pocket of the ATC. Also, see above. See "Extractor Fork
Replacement" section, if necessary.
NOTE: If the ATC shows the problem as described here, each extractor fork must be checked and centered to eliminate
the possibility of the ATC being aligned against an incorrectly-centered fork.
4.2 CRASHING
Crashing of the ATC is usually a result of operator error. The most common ATC crashes are outlined as follows:
´ Shuttle crashes into spindle when a tool change is commanded (tool holder is in
the pocket facing the spindle head).
l Rotate the carousel to an empty pocket. Refer to the Programming and Operation manual for correct operation.
NOTE: This crash is fairly common and is a result of operator error. If the ATC is stopped in the middle of tool change
cycle, the operator must command the ATC to an empty pocket before the machine will operate correctly. Repeated
crashes of this type can damage the I/O board, the slip clutch, and the shuttle motor in the ATC.
´ During a tool change spindle crashes into top of the tool holder after a turret rotation.
When the spindle head moves down over the top of the tool holder during a tool change, the pull stud will bind inside
the drawbar bore of the spindle, forcing the ATC down, bending the upper right roller bolt on the ATC shuttle
or completely breaking it off. Tool holder is not held correctly in the extractor fork, possibly held only in one side of
the extractor and at an odd angle.
l Check all of the extractor forks on the ATC.
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