Ingersoll-Rand 8670-( )-3( ), 8670-( )-1( ) manual Mounting, SET-UP Procedure

top of valve housing. The unit will immediately retract to the initial position, whereupon the unit will stop with all air to the unit shut off.

The needle type retract feed control valve regulates the flow of air from the piston, thus regulating the rate of retraction of the unit. The model 8670-( ) is furnished with a hydraulic check to control the rate of forward feed of the unit-see page 12 for set-up proce- dure.

SPECIAL NOTE: There are two needle valves (34617) contained in the valve block. One needle valve is for the retract feed control. The other needle valve [visible only after the removal of the name- plate (45184)) should not be adjusted or removed. If this needle valve should ever be removed, the correct assembled position is -the top of the needle valve flush with the top of the valve block.

The unit may be operated remotely thru the use of the start and retract signal ports located in top of the valve housing, using rec- ommended fittings, tubing and valves - see page 16.

The auxiliary supply port is pressurized whenever air is present at the air inlet of the tool.

The depth signal port is momentarily pressurized at the comple- tion of the forward feed stroke when the retract valve (44981) is actuated and can be used to activate a remote valve for the pur- pose of starting another tool or an accessory function.

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The tool retracted signal port is located in rear of piston rod (44928-). The port is pressurized when motor starts and remains pressurized during the drilling cycle, until motor shuts off when unit is fully retracted.

The valve section can be easily removed from tool for servicing and replaced with a spare unit, eliminating excessive down-time of tool. See page 4 for removal instructions.

MOTOR AND GEARING SECTION

The motor and gearing section has been designed into a single unit that can be easily removed from tool and replaced with a spare unit while it is being serviced or repaired, eliminating exces- sive down-time of tool. See page 4 for removal from tool.

HOUSING AND VALVE SECTION

The housing and valve section consists of a main housing, which houses the piston section and motor and gearing section, and the valve housing, which houses the retract valve that is actuated by the adjustment screw contained in the trip bracket. The retract valve components are accessible by removing striker plate (44987) from rear of valve housing. The piston and components are accessible by separating the main housing from the valve housing. See page 4 for disassembly procedure.

MOUNTING

The nose end of tool housing is provided with 2-7/8”-16 I.h. threads and a 2.873” x2-1/4” long pilot diameter for fixture mount- ing. A foot type mounting bracket and nose housing are available

as accessory items for tool mounting (see accessories section). The tool can be mounted in any position desired without impairing the function of the tool (see set-up procedure).

SET-UP PROCEDURE

At the time the model 8670-( ) self-feed drill is set up for opera- tion, a minimum distance of 1/4” must be maintained between the work piece and the point of the drill bit, with the drilling unit in the fully retracted position. This will allow the air motor to start and reach free speed before the drill reaches the work piece.

STROKE ADJUSTMENT

Determine the total stroke length the drill must travel to perform the drilling operation (see figure 1). Adjust the length of the stroke by loosening the two cap screws (Y99-42) which secure the trip bracket to the piston rod. Position the trip bracket on the piston rod so the distance between the trip bracket and the striker plate is somewhat greater than the desired stroke length and tighten the two screws (Y99-42), securing trip bracket on piston rod. Next, ro- tate adjustment screw (Y157-64) so the distance between the leading edge of the screw and the striker plate equals the desired total stroke length. A final adjustment of the adjustment screw can be made while testing the drilling operation on a few scrap work pieces to insure desired drilling depth is obtained.

FEED CONTROL VALVES

The models 8670-( ) are shipped from the factory with the retract feed regulating valve set at a fairly slow rate of feed. Turn valve counterclockwise to increase rate of feed. Turn valve clockwise to decrease rate of feed.

TIMING VALVES (59231 METERING NEEDLE)

The timing valve (59231 metering needle), located at the rear of the valve section, is used to regulate the time lapse between the time the drill bit has reached the pm-set drilling depth and the time the unit retracts. The timing valve can be adjusted so the unit will retract immediately, up thru a range of approximately seven se- conds (0 - 7 seconds). Turn the timing valve clockwise (in) to in- crease the time delay. Turn the valve counterclockwise (out) to decrease the time delay.

NOTE: A final adjustment of the adjusting screw (Y157-64) may be necessary after adjusting the timing valve to insure precise depth of drilling operation.

RETRACT VALVE

ADJUSTMENT SCREW

TOTAL STROKE LENGTH

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