Section 7 Troubleshooting HP7A Manual
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7-4
Chatter in bore.
Vertical lines extending from the top to the bottom of the bore.
Possible Cause: Bad Bearings.
If a bearing goes bad in the upper gearbox, it will tend to leave a vertical pattern in the cylinder.
When honing especially hard blocks, the chatter becomes a lot more noticeable. A bearing can go
bad from normal or hard usage and from a machine crash in the bottom of the bore. Contact the
factory for a loaner gearbox while yours is being repaired.
Slow Stock Removal.
Possible Cause: Diamonds need dressing.
For diamond dressing instructions refer to Maintenance section of this manual.
Machine not stroking.
Possible Cause: Feed Ring not set correctly
If you are making a small adjustment to the Feed Ring it is important to back off the hand wheel
several notches (5 to 10) before pressing the Auto Cycle button again. The HP7A takes at least two
strokes to calculate the Strokes Per Minute and the load on the stones. If there is not enough stoking
time before the “0” on the feed ring is reached, the control does not have enough data to calculate the
correct stopping time for the hone head.
Possible Cause: Upper Stop Senor Adjustment
If the upper stop sensor is not reading the machine can stroke and then stop at the top of the cylinder
and not return towards the bottom. This can be intermittent. The hone head will continue to rotate
even after travel has stopped. Refer to the Upper Sensor adjustment in the Maintenance section of
this manual.
Possible Cause: Stroke Lever
Sometimes the stroking speed lever on the front right hand side of the spindle carriage has been
moved into the full upright position. This will not allow any hydraulic uid to pass. Therefore, the
machine will not be able to stroke.
Possible Cause: Solenoid or Board Failure.
As with all electronic devices, solenoids will eventually fail. To determine if the solenoid is bad, turn
the spindle on and press the stroke button. Does the stroke button light up?
If not then the I/O board should be replaced.
If the light does come on, but the rocker arm still does not stroke, leave the light on and locate the
stroking solenoids in the back of the carriage. There is a small button on these solenoids so they
can be manually activated. Use a small Allen wrench or similar device to depress these buttons.
The rocker arm should go down. If you release the buttons the rocker arm should go back up. If the
rocker arm does not go down when the buttons are depressed check all air lines for kinks.
If the rocker arm goes down as stated, turn the machine power off, check all wiring at solenoids, and
in the rear enclosure. If the machine still does not stroke after checking the wiring, contact the factory
for possible solenoid or board replacement.
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