SET-UP Procedure

SET-UP PROCEDURE: The ARO Lead Screw Tapper is adapt- able to many applications. Its maximum stroke of 2” can be re- duced to a minimum stroke of 3/16” by adjusting the “RETRACT’ and “STOP” trip tabs, located beneath the nameplate door. Any stroke setting of less than 2” can be positioned at any point within the 2” length by properly setting the trip tabs.

When shipped from the factory, the spindle is in its full retracted position with the internal sleeve bracket addressing the “STOP” trip tab and the inside edge of the trip tab directly under the zero (0) index line on the gauge plate (step 1). The unit is thus properly cal- ibrated forstroke indication. In this position, the unit should remain stopped when air is admitted to the main air inlet.

IMPORTANT NOTE: Adjustment of the trip tabs should be made BEFORE connecting air pressure to the tool or with the air supply line to the tool shut off and exhausted (drained) of compressed air.

Prior to setting the stop trip tab, the spindle will have to be ad- vanced at least 1/4” in order to allow moving the stop tab to the left (trip bracket 41235 must be moved away from trip tab). To accom- plish this, rotate chuck until trip bracket has moved sufficiently for- ward to allow the stop trip tab to be moved to the desired position.

The purpose of setting the stop trip is to prevent excessive “cut- ting of air” during the advance cycle, decreasing cycle time and increasing production.

The following example of set-up (figure 1) is given to explain the setting of the “RETRACT” and “STOP” trip tabs.

1.Determine the distance between the tap and the desired tap penetration into the workpiece (3/4” in illustration). Loosen set screw in retract trip tab one (1) turn and slide tab so the inside edge of the tab is aligned with the 3/4” mark on the in- dex scale. Tighten set screw (step 1).

2.To determine the distance necessary to retract the tap to suf- ficiently clear the workpiece (9/16” in illustration), subtract a constant of 1/16” from the 9/16” (9/16” - 1/16” = 1/2”). Sub- tract the remainder (1/2”) from the previously set desired tap penetration (3/4”) to yield 1/4” (3/4” - 1/2” = 1/4”). Loosen set screw one turn in stop trip tab and slide tab so the inside edge of tab is aligned with the 1/4” mark on the index scale (step 2). Subtraction of the constant 1/16” is necessary to allow for the spindle over-running the set stop position by l/l 6”.

Once set, the depth control will consistently repeat within .005”, assuming stable air pressure is maintained (90 p.s.i.g.) at the air inlet.

BEFORE STARTING tool, be sure pitch of tap and lead screw match. Thread pitch is etched on both the lead screw and lead screw nut.

RETRACT TAB-’		STOP TAB
ACTUATOR	40521-1	L TRIP BRACKET	41235
DESIRED	TAP PENETRATION

1/16 CLEARANCE

TOTAL DESIRED RETRACT LENGTH

FIGURE 1

(PUSH LEFT TO RETRACT)	TAB
	(PUSH RIGHT TO STOP)

POSITION OF TRIP TABS AFTER UNIT HAS BEEN ADVANCED AND STOPPED, SHOWING 1/16” OVERRIDE

STEP 2

POSITION OF TRIP TABS AFTER COMPLETE CYCLE AND WITH 1/16” OVERRIDE

FIGURE 2

8655-B()-(), 8657-B()-(), 8656-B()-(), 8658-B()-() and 8659-B()-() specifications

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