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OPERATOR’S MANUAL
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE
BANT-A-MATIC® SELF-FEED DRILLS
Models 8248-B( )-( )
SECTION
M106
MANUAL
21
Released: 4-1-68
Revised: 12-12-94
Form: 3262-2
IMPORTANT: READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
OPERATING PRECAUTIONS
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Keep hands and clothing away from rotating end of tool.
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Wear suitable eye protection while operating tool.
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Disconnect air supply from tool before removing/installing bit
or performing other maintenance procedures.
ROUTINE LUBRICATION REQUIREMENTS
Lack of or an excessive amount of lubrication will affect the perfor-
mance and life of this tool. Use only recommended lubricants at
below time intervals:
EVERY 8 HOURS OF TOOL OPERATION - Fill lubricator reser-
voir of recommended F.R.L. with spindle oil (29665).
EVERY 160 HOURS OF TOOL OPERATION - Inject NLGI #1
“EP” grease (33153), 1 to 2 strokes, thru grease fitting in gear
housing. NOTE: Spindle must be extended from outer sleeve suf-
ficiently to expose grease fitting in gear housing. Gearing should
contain approximately 1/8 oz. (3.5 g) of grease.
AIR SUPPLY REQUIREMENTS
For maximum operating efficiency, the following air supply specifi-
cations should be maintained to this air tool:
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AIR PRESSURE - 90 PSIG (6 bar)
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AIR FILTRATION - 50 micron
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LUBRICATED AIR SUPPLY
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HOSE SIZE - 5/16” (8 mm) I.D.
An ARO® model C28231-810 air line FILTER/REGULATOR/LU-
BRICATOR (F.R.L.) is recommended to maintain the above air
supply specifications.
MOUNTING
The nose end of the outer sleeve (41) is provided with 1-7/16” -
18 L.H. threads [remove thread guard (47) for use] and a 1-7/16”x
1/2” long pilot diameter for fixture mounting. Foot and flange type
mounting brackets are available for tool mounting.
RECOMMENDED LUBRICANTS
Afterdisassembly is complete, all parts, except sealed or shielded
bearings, should be washed with solvent. To relubricate parts, or
for routine lubrication, use the following recommended lubricants:
Where Used
- Description
Air Motor
29665 1 qt. Spindle Oil
“0” Rings & Lip Seals
36460 4 oz. Stringy Lubricant
Gears and Bearings
33153
5 lb. “EP” - NLGI #1 Grease
SET-UP PROCEDURE
WARNING: Keep clear of rotating end of unit with hands and/or
clothing. Keep fingers/hands from being pinched between hous-
ing or valves and adjustment screws and/or trip bracket.
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Loosen two screws (29) and remove cover (1).
Allow a minimum distance of 1/4” between the drill point of the
unit and the workpiece. This is necessary for the air motor to
start and reach free speed before the drill point touches the
workpiece.
Determine the TOTAL STROKE LENGTH the drill must travel
to perform the drilling operation - see illustration below.
Loosen jam nut (8) and turn adjustment screw “A” so the dis-
tance between the end of the screw and the stud (26) equals
the total stroke length.
Tighten jam nut (8).
Loosen jam nut (8) and turn adjustment screw “B” (valve-in-
head models only) so the distance between the end of the
screw and the button bleed valve (25) is slightly GREATER
than the distance set for adjustment screw “A”.
Start and let the unit advance until the adjustment screw “A”
makes contact with the stud (26).
Carefully, and be aware that the unit is going to retract, turn the
adjustment screw “B” until it depresses the button bleed valve
(25) enough to cause the unit to retract.
lighten jam nut (8).
See “FEED RATE CONTROL VALVES”, page 2.
ADJUSTMENT SCREW “6”
7
DEPTH OF DRILLING
OPERATION
THIS DISTANCE MUST
TOTAL STROKE LENGTH
ADJUSTMENT SCREW “‘A’
For parts and service information, contact your local ARO distributor, or the Customer Service Dept. of the Ingersoll-Rand Dis-
tribution Center, White House, TN at PH: (615) 672-0321, FAX: (615) 672-0601.
A
R0 Tool Products
Ingersoll-Rand Company
INGERSOLL-RAND,
1725 U.S. No. 1 North
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P.O. Box 8000
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Southern Pines, NC 283888000
01994 THE ARO CORPORATION. PRINTED IN U.S.A.