Ingersoll-Rand 8655-B()-(), 8656-B()-(), 8657-B()-() manual General Description and Operation

GENERAL DESCRIPTION AND OPERATION

The tapping cycle is started by manually actuating and releasing “START’ valve at the tool. The start valve must be held long enough to allow the stop signal valve to close (page 9); about one

(1) second duration for most applications.

NOTE: For very low spindle speeds with medium to fine pitch lead screw, the signal duration may need to be increased beyond one second. For very high spindle speeds and short stroke settings, the signal duration may need to be decreased and positively con- trolled - consult factory in this case.

The unit will advance the tap to a pre-set depth and automatically retract to the initial position whereupon the unit will stop with all air

to the unit shut-off. To aid set-up procedure, ‘RETRACT” and “STOP” may be manually initiated at the tool by actuating one of two trip tabs located inside the nameplate cover. Swing cover up for for access (page 4).

WARNING: Do not use fingers to manually actuate trip tabs - use a blade type screwdriver or similar tool.

The ARO Lead Screw Tapper may be used in a single unit ap- plication or a multiple unit application.

The maximum stroke length of unit is 2”. Maximum stroke length of unit with dual spindle head is 1-1/4”.

	,-ACCESSORY	PORT “C”
	REMOTE	START	PORT “B”
PORT “D” - CONNECT TO	SECONDARY		EXHAUST EXIT
SENSOR VALVE - PORT “F”-				PORT “F” - SENSOR	VALVE
				-SENSOR	VALVE

-PORT “A” -TO SUPPLY AIR TO

REMOTE RETRACT PORT “E”

SENSOR VALVE - PORT “G”

		PRIMARY	EXHAUST EXIT
ALL PORTS 1/18” N.P.T.		DRIVE GEARING
-MANUAL	START VALVE	AUXILIARY	GEARING

AIR TUBES

,

The three basic sections of the Lead Screw Tapper are arranged for efficient maintenance. The following is a brief description of the sections and their functions.

VALVE SECTION is composed of a two-way and a four-way spool valve, both being a two position, double pilot pressure oper- ated type.

The tap function is manually actuated by the operator while the “RETRACT” and “STOP” functions are automatically actuated by the tool. The start valve must be depressed with a short duration of dwell when starting a cycle from the automatically stopped posi- tion. Hold valve down only so long as necessary to properly start the advance (1 second). “RETRACT’ and “STOP” trip tabs need only be depressed briefly to achieve proper response.

Located between and piloting within the “RETRACT” and “STOP” valves isactuator (40521-1) with the two trip tabs (40523-1) pilot-

ACCESS PORT FOR LEAD NUT

TENSION ADJUSTMENT

ing on the actuator with set screws provided to hold a positive set- ting between either trip tab and the actuator (page 4). It is the purpose of the adjustable trip tabs to provide contact with the bracket on the traversing spindle drive and properly actuate the “RETRACT” and “STOP”valves to achieve the proper mode. The “START”and “RETRACT” functions may be manually operated at the tool or remotely operated through remote inlet ports using rec- ommended tubing, fittings and valves (see page 19 for remote control hook-up).

Each time the “START”valve is depressed, the unit will start in the advancing (forward) mode.

To start in the retract mode when the unit has been stopped in mid-stroke, depress and hold retract tab to the left and press the “START” valve and release retract tab after retraction com- mences (see warning note above).

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