Control Definition
2-3 HP6A Manual
The solenoid provides air pressure to the stroking cylinder on the topside forcing the rocker arm down.
The solenoid is electrically controlled from the computer in the control panel, and is kept energized until
the lower limit switch is activated.
Once the lower limit switch is activated the computer will shut off the down air solenoid and energize the
up air solenoid. The up air solenoid provides air pressure to the bottom of the stroking cylinder forcing
the rocker arm to move up, and will remain energized until the upper limit switch is activated. Once
activated it will again force the rocker arm down. These actions will continue seamlessly until the
Start/Stop, Stroke, or E-Stop is pressed. If the machine is running an automatic cycle the stroking will
continue until the cycle is finished or any of the fore mentioned buttons are pressed.
Stroking Speed Control:
The rear cylinder on the carriage provides smooth control of the stroking motion, and stroking speed
control. This hydraulic cylinder pumps liquid back and forth through a ball valve, which is located on the
right side of the carriage.
Opening and closing this valve changes stroking speed. The current strokes per minute are displayed on
the control panel. The strokes per minute can be changed at any time during the honing process.
A reservoir is located on the carriage behind the rocker arm pivot. This reservoir compensates for volume
change due to temperature variations. The reservoir liquid is fed through a check valve, located on the
side of the reservoir.
Hone Head RPM Control:
A potentiometer is located on the left-hand side of the control panel, and is used to vary the speed at
which the hone head rotates. This potentiometer connects to a AC, 3 HP Inverter drive. The hone head
has a variable speed between 85 and 285 RPM’s. Turn the potentiometer clockwise to increase speed
and counter clockwise to decrease speed. Use the formula on page 3.5 to determine Cross Hatch angle,
RPM and Stroke Rate.
Short Stroke / Bottom Dwell Button:
The Short Stroke / Bottom Dwell button is located on the lower left hand side of the main control panel on
the front of the machine. The button is electronically connected to the main computer in the control panel.
This button has two (2) functions. It can be a short stroke at the bottom of the cylinder or it can be a dwell
button at the bottom of the cylinder. Which function is used is determined by a address code setting. The
Address Code that controls this function is number 75. Refer to the Machine Parameter table on page
2.5 of this manual for usage. If programmed for short stroke the control will energize the Up and Down
solenoid in quick succession at the bottom of the cylinder for as long as the button is held in. If it is
programmed for Dwell the head will stay down at the bottom of the cylinder and rotate until the button is
released.
Note: The Short Stroke / Dwell button is generally not needed when using the automatic cycle.
As the Auto Cycle finishes it will straighten out the cylinder. Short stroke is usually only used
when there is a clearance issue at the bottom of the bore that will not allow enough over stroke to
be set.
Finish RPM Bypass Switch:
This switch is for bypassing the preset finish mode RPM setting. In certain circumstances the desired
cross hatch angle can not be obtained using the preset RPM in finish mode. In the off position the
operator can control the spindle RPM using the control knob to obtain the desired cross hatch angle.
Strokes Per Minute Display:
This is the upper left display that counts and displays the number of strokes per minute the Rocker Arm is
transitioning up and down.
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