Control Definition
2-1 HP6A Manual
Chapter 2 Control Definition:
The following information describes the sequence of control actions.
Description of Operation:
The HP6A hone has several modes of operation, all modes of operation are listed below.
• Target Load
• Target Load with auto short stroke and auto dwell options.
• Plateau Mode
Target Load (Standard):
In this mode of operation the operator will set a Roughing load and a Finish load on the control panel for
the HP6A to operate at. For this example we will set the Roughing load at 70 and the Finish load at 30.
These are percentages of full motor load. Once the automatic cycle is started the machine will
automatically feed the stones out one increment at the bottom of each stroke until the Roughing load is
reached. Once the Roughing load is reached the machine will maintain that load by feeding out when the
load drops below 70 percent. This process will continue until the feed ring activates the Finish load
sensor.
Once the Finish sensor (located on the rear of the Gearbox) has been activated the machine will
automatically switch to Finish mode and display the set Finish load value. The machine will no longer
feed out. It will continue stroking until the displayed load value matches the set Finish value. Once these
values match machine will automatically stop at the top of the cylinder.
Note: To set the Finish load the Finish sensor must be activated, otherwise the machine will
display the Roughing load.
Target Load (Auto Short Stroke and/or Auto Dwell):
This mode operates the same as the Target Load (standard) with some options. You are able to turn the
Auto Short Stroke and Auto Dwell on and off in the Roughing as well as Finish modes of operation. Refer
to the Machine Parameter table on page 2.5 for these address codes and their settings.
Short Stroke:
When the controller notices that the load in the lower ¼ of the bore is 10% higher than the average of the
rest of the cylinder it will automatically short stroke to remove the taper. The short stroke cycle consists of
ten (10) short strokes at the bottom of the cylinder and then four (4) normal length strokes. After this
cycle the controller will again compare the loads and short stroke again if necessary.
Dwell:
When the controller notices that the load in the lower ¼ of the bore is 10% higher than the average of the
rest of the cylinder it will automatically dwell to remove the taper. The amount of dwell time can be set in
the Machine Parameter table on page 2.5. After this cycle the controller will again compare the loads and
short stroke again if necessary.
Note: This feature should only be used on blocks that have a interference problem in the lower
portion of the bore that does not allow enough over stroke to be set. If this mode of operation is
used continuously without setting the proper amount of over stroke, the stones can get uneven
wear on them, increasing the amount of taper and problems in honing.
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