Troubleshooting
5-3
HP6A Manual
and then measure the bottom of the same stones. If the bottom of the stones measure out
smaller than the top, this will also create taper in the cylinder.
Possible Cause: Incorrect Pressure settings.
It is possible to set the Rough and Finish load setting improper for a certain type of cylinder. If
there is very little support around a cylinder, using a high rough setting can cause the walls of the
cylinder to push out while honing, and then to come in when there is no longer pressure on the
cylinder wall. This would create a hour glass shaped cylinder. You can account for this by
lowering the rough and finish settings. A lower rough setting will not push the walls out as much.
A lower finish setting gives the hone head additional time to remove material from the block to
straighten it.
Possible Cause: Diamonds need dressing.
For diamond dressing instructions refer to page 3.8 of this manual.
Symptom: Erratic Finish Sizes
If the hone is not maintaining size from one bore to the next.
Possible Cause: Hone Head not connected properly.
The most common cause of erratic cylinder size is a wrong connection between the Driven
Coupling (514-6-44 page 7.2) and Coupler Sleeve (514-6-41 page 6.15). When changing the
hone head and yoke be sure not to put any upward pressure on the cone (514-9-7A page 7.2),
this will cause the driven coupling not to engage correctly with the coupler sleeve. When not
engaged correctly the driven coupling can move around and cause the stones not to feed out
correctly.
Possible Cause: Fluctuating Power.
If the incoming power to the machine is fluctuating more than 10 volts AC, it will cause the load
display to fluctuate. Since the machines stopping times are set on the load value this can cause
size variance. The power company can usually monitor the power and make recommendations
for fixing the problem.
Possible Cause: Spindle Speed Changes.
Changing the spindle speed between cylinders will increase the load on the motor and thus the
machine will shut off at a different size. Do not change the spindle speed between bores.
Symptom: 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.
Symptom: Slow Stock Removal.
Possible Cause: Diamonds need dressing.
For diamond dressing instructions refer to page 3.8 of this manual.
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