Delta 31-390, 31-392 User Manual
INSTRUCTION MANUAL
6" Edge Sander
(Model 31-390, 391, 392)
PART NO. 406-11-651-0006 - 03-12-02
Copyright © 2002 Delta Machinery
To learn more about DELTA MACHINERY
visit our website at: www.deltamachinery.com.
For Parts, Service, Warranty or other Assistance,
please call
1-800-223-7278 (In Canada call 1-800-463-3582).
2
GENERAL SAFETY RULES
Woodworking can be dangerous if safe and proper operating procedures are not followed. As with all machinery, there
are certain hazards involved with the operation of the product. Using the machine with respect and caution will
considerably lessen the possibility of personal injury. However, if normal safety precautions are overlooked or ignored,
personal injury to the operator may result. Safety equipment such as guards, push sticks, hold-downs, featherboards,
goggles, dust masks and hearing protection can reduce your potential for injury. But even the best guard won’t make
up for poor judgment, carelessness or inattention. Always use common sense
and exercise caution
in the workshop.
If a procedure feels dangerous, don’t try it. Figure out an alternative procedure that feels safer. REMEMBER: Your
personal safety is your responsibility.
This machine was designed for certain applications only. Delta Machinery strongly recommends that this machine not
be modified and/or used for any application other than that for which it was designed. If you have any questions relative
to a particular application, DO NOT use the machine until you have first contacted Delta to determine if it can or should
be performed on the product.
Technical Service Manager
Delta Machinery
4825 Highway 45 North
Jackson, TN 38305
(IN CANADA: 505 SOUTHGATE DRIVE, GUELPH, ONTARIO N1H 6M7)
WARNING: FAILURE TO FOLLOW THESE RULES MAY RESULT IN SERIOUS PERSONAL INJURY
1. FOR YOUR OWN SAFETY, READ INSTRUCTION
MANUAL BEFORE OPERATING THE TOOL. Learn the
tool’s application and limitations as well as the specific
hazards peculiar to it.
2. KEEP GUARDS IN PLACE and in working order.
3. ALWAYS WEAR EYE PROTECTION.
Wear safety
glasses. Everyday eyeglasses only have impact resistant
lenses; they are not safety glasses. Also use face or dust
mask if cutting operation is dusty. These safety glasses
must conform to ANSI Z87.1 requirements. NOTE:
Approved glasses have Z87 printed or stamped on them.
4. REMOVE ADJUSTING KEYS AND WRENCHES. Form
habit of checking to see that keys and adjusting wrenches
are removed from tool before turning it “on”.
5. KEEP WORK AREA CLEAN. Cluttered areas and
benches invite accidents.
6. DON’T USE IN DANGEROUS ENVIRONMENT. Don’t
use power tools in damp or wet locations, or expose them
to rain. Keep work area well-lighted.
7. KEEP CHILDREN AND VISITORS AWAY. All children
and visitors should be kept a safe distance from work area.
8. MAKE WORKSHOP CHILDPROOF – with padlocks,
master switches, or by removing starter keys.
9. DON’T FORCE TOOL. It will do the job better and be
safer at the rate for which it was designed.
10. USE RIGHT TOOL. Don’t force tool or attachment to
do a job for which it was not designed.
11. WEAR PROPER APPAREL. No loose clothing, gloves,
neckties, rings, bracelets, or other jewelry to get caught in
moving parts. Nonslip footwear is recommended. Wear
protective hair covering to contain long hair.
12. SECURE WORK. Use clamps or a vise to hold work
when practical. It’s safer than using your hand and frees
both hands to operate tool.
13. DON’T OVERREACH. Keep proper footing and
balance at all times.
14. MAINTAIN TOOLS IN TOP CONDITION. Keep tools
sharp and clean for best and safest performance. Follow
instructions for lubricating and changing accessories.
15. DISCONNECT TOOLS before servicing and when
changing accessories such as blades, bits, cutters, etc.
16. USE RECOMMENDED ACCESSORIES. The use of
accessories and attachments not recommended by Delta
may cause hazards or risk of injury to persons.
17. REDUCE THE RISK OF UNINTENTIONAL STARTING.
Make sure switch is in “OFF” position before plugging in
power cord.
In the event of a power failure, move switch
to the “OFF” position.
18. NEVER STAND ON TOOL. Serious injury could occur if
the tool is tipped or if the cutting tool is accidentally
contacted.
19. CHECK DAMAGED PARTS. Before further use of the
tool, a guard or other part that is damaged should be
carefully checked to ensure that it will operate properly and
perform its intended function – check for alignment of
moving parts, binding of moving parts, breakage of parts,
mounting, and any other conditions that may affect its
operation. A guard or other part that is damaged should be
properly repaired or replaced.
20. DIRECTION OF FEED. Feed work into a blade or
cutter against the direction of rotation of the blade or cutter
only.
21. NEVER LEAVE TOOL RUNNING UNATTENDED.
TURN POWER OFF. Don’t leave tool until it comes to a
complete stop.
22.
STAY ALERT, WATCH WHAT YOU ARE DOING, AND
USE COMMON SENSE WHEN OPERATING A POWER
TOOL. DO NOT USE TOOL WHILE TIRED OR UNDER
THE INFLUENCE OF DRUGS, ALCOHOL, OR
MEDICATION. A moment of inattention while operating
power tools may result in serious personal injury.
23. MAKE SURE TOOL IS DISCONNECTED FROM
POWER SUPPLY while motor is being mounted,
connected or reconnected.
24. THE DUST GENERATED by certain woods and wood
products can be injurious to your health. Always operate
machinery in well ventilated areas and provide for proper
dust removal. Use wood dust collection systems whenever
possible.
25.
WARNING: SOME DUST CREATED BY POWER
SANDING, SAWING, GRINDING, DRILLING, AND
OTHER CONSTRUCTION ACTIVITIES contains
chemicals known to cause cancer, birth defects or other
reproductive harm. Some examples of these chemicals
are:
· lead from lead-based paints,
· crystalline silica from bricks and cement and other
masonry products, and
· arsenic and chromium from chemically-treated lumber.
Your risk from these exposures varies, depending on how
often you do this type of work. To reduce your exposure
to these chemicals: work in a well ventilated area, and
work with approved safety equipment, such as those
dust masks that are specially designed to filter out
microscopic particles.
SAVE THESE INSTRUCTIONS.
Refer to them often and use them to instruct others.
ADDITIONAL SAFETY RULES FOR
ABRASIVE FINISHING MACHINES
1. DO NOT OPERATE THIS MACHINE UNTIL it is
assembled and installed according to the instructions.
2. OBTAIN ADVICE from your supervisor, instructor, or
another qualified person if you are not familiar with the
operation of this machine.
3. FOLLOW ALL WIRING CODES and recommended
electrical connections.
4. USE THE GUARDS WHENEVER POSSIBLE. Check
to see that they are in place, secured, and working
correctly.
5. CHECK BELTS for wear and tension. If the belt is
damaged or can’t be tensioned properly, replace it.
6. CHECK FOR CORRECT BELT INSTALLATION, and
insure that the belt is tracking properly.
7. KEEP ARMS, HANDS, AND FINGERS away from
abrasive surfaces.
8. AVOID AWKWARD OPERATIONS AND HAND
POSITIONS where a sudden slip could cause a hand
to contact the sanding surface.
9. NEVER WEAR GLOVES or hold the workpiece with a
rag when sanding.
10. NEVER START THE MACHINE with the workpiece
against the sanding surface.
11. NEVER START THE MACHINE before clearing the
table of all objects (tools, scrap pieces, etc.).
12. MAINTAIN MINIMUM CLEARANCE between the
table and the sanding surface.
13. USE A BACKSTOP when using the belt finishing
machine in a horizontal position.
14. FEED THE WORKPIECE AGAINST THE
ROTATION OF THE SANDING SURFACE. Hold
the workpiece securely on the table.
15. USE A DUST COLLECTION SYSTEM.
16. CLEAN THE MACHINE AND DUST
COLLECTION SYSTEM THOROUGHLY BEFORE
AND AFTER SANDING METAL. Combining wood
dust and metal filings (or aluminum filings and
metal filings) can create a fire hazard. DO NOT
sand magnesium. It is highly flammable.
17. FOR DRUM SANDERS, DO NOT SAND
WORKPIECES SHORTER THAN 7" or thinner
than 1/32".
18. PROPERLY SUPPORT LONG OR WIDE
workpieces.
19. DISCONNECT THE MACHINE from the power
source before installing or removing accessories,
before adjusting or changing set-ups, or when making
repairs.
20. DISCONNECT THE MACHINE from the power
source, and clean the table/work area before leaving
the machine. LOCK THE SWITCH IN THE “OFF”
POSITION to prevent unauthorized use.
21. ADDITIONAL INFORMATION regarding the safe and
proper operation of this machine is available from the
Power Tool Institute, 1300 Summer Avenue,
Cleveland, OH 44115-2851. Information is also
available from the National Safety Council, 1121
Spring Lake Drive, Itasca, IL 60143-3201. Please refer
to the American National Standards Institute ANSI
01.1 Safety Requirements for Woodworking
Machines and the U.S. Department of Labor OSHA
1910.213 Regulations.
WARNING: FAILURE TO FOLLOW THESE RULES MAY RESULT IN SERIOUS PERSONAL INJURY.
3
SAVE THESE INSTRUCTIONS.
Refer to them often
and use them to instruct others.
4
POWER CONNECTIONS
A separate electrical circuit should be used for your tools. This circuit should not be less than #12 wire and should be
protected with a 20 Amp time lag fuse. If an extension cord is used, use only 3-wire extension cords which have 3prong grounding type plugs and matching receptacle which will accept the tool’s plug. Before connecting the motor to
the power line, make sure the switch is in the “OFF” position and be sure that the electric current is of the same
characteristics as indicated on the tool. All line connections should make good contact. Running on low voltage will
damage the motor.
WARNING: DO NOT EXPOSE THE TOOL TO RAIN OR OPERATE THE TOOL IN DAMP LOCATIONS.
MOTOR SPECIFICATIONS
Your tool is wired for 230 volt, 60 HZ alternating current. Before connecting the tool to the power source, make sure
the switch is in the “OFF” position.
GROUNDING INSTRUCTIONS
WARNING: THIS TOOL MUST BE GROUNDED WHILE IN USE TO PROTECT THE OPERATOR FROM
ELECTRIC SHOCK.
SINGLE PHASE INSTALLATION 31-390
The motor on your tool is wired for 230 Volt, single phase
operation. The power cord is equipped with a plug that
has two flat current carrying prongs in tandem and one
round or "U" shaped longer ground prong. This is used
only with the proper mating 3-conductor grounding type
receptacle, as shown in Fig. A.
When the 230 Volt, three prong plug is plugged into a
grounded 3-conductor receptacle, as shown in Fig. A,
the long ground prong on the plug contacts first, so the
tool is properly grounded before electricity reaches it.
THREE PHASE INSTALLATION 31-391
The motor on your tool is to be wired for 230 Volt, three
phase operation, a power cord and plug is not supplied
with the tool. To bring power to the tool proceed as
follows:
1. Remove cover from the starter box.
2. Bring the three phase power cord through the entrance hole in the bottom of starter box and connect the
three power leads to terminals Ll, L2 and L3 and the
ground wire to one of the terminals on the grounding
strip shown in Fig. B.
3. Turn the tool on and off and check if the sanding belt
is rotating in the right direction. The sanding belt should
turn counterclockwise when looking down on the belt.
4. If the sanding belt is rotating in the wrong direction,
DISCONNECT THE TOOL FROM THE POWER
SOURCE and interchange any two of the three leads
that are connected to terminals Ll, L2, L3, Fig. B.
5. Replace cover on the starter box.
PERMANENTLY CONNECTED TOOLS:
If the tool is intended to be permanently connected the
tool should be connected to a grounded metal
permanent wiring system; or to a system having an
equipment-grounding conductor.
WARNING: IN ALL CASES, MAKE CERTAIN THE
MACHINE IN QUESTION IS PROPERLY
GROUNDED. IF YOU ARE NOT SURE HAVE A
QUALIFIED ELECTRICIAN CHECK THE MACHINE.
1. All grounded, cord-connected tools:
In the event of a malfunction or breakdown, grounding
provides a path of least resistance for electric current to
reduce the risk of electric shock. This tool is equipped with
an electric cord having an equipment-grounding
conductor and a grounding plug. The plug must be
plugged into a matching outlet that is properly installed
and grounded in accordance with all local codes and
ordinances.
Do not modify the plug provided - if it will not fit the outlet,
have the proper outlet installed by a qualified electrician.
Improper connection of the equipment-grounding
conductor can result in risk of electric shock. The
conductor with insulation having an outer surface that is
green with or without yellow stripes is the equipmentgrounding conductor. If repair or replacement of the
electric cord or plug is necessary, do not connect the
equipment-grounding conductor to a live terminal.
Check with a qualified electrician or service personnel if
the grounding instructions are not completely understood,
or if in doubt as to whether the tool is properly grounded.
Use only 3-wire extension cords that have 3-prong
grounding type plugs and matching 3-conductor
receptacles that accept the tool’s plug, as shown in Fig. A.
Repair or replace damaged or worn cord immediately.
2. Grounded, cord-connected tools intended for use on
a supply circuit having a nominal rating between 150 250 volts, inclusive:
If the tool is intended for use on a circuit that has an
outlet that looks like the one illustrated in Fig. A. The tool
will have a grounding plug that looks like the plug
illustrated in Fig. A. Make sure the tool is connected to
an outlet having the same configuration as the plug. No
adapter is available or should be used with this tool. If
the tool must be re-connected for use on a different type
of electric circuit, the re-connection should be made by
qualified service personnel; and after re-connection, the
tool should comply with all local codes and ordinances.
Fig. A
FUNCTIONAL DESCRIPTION
FOREWORD
Delta Model 31-390 is a large capacity Edge Sander for fast, efficient, straight and bevel edge sanding with the added
ability to handle contour sanding jobs. The standard unit includes; motor, stand legs, push-button controls, magnetic
starter, transformer, overload protection, laminate coated tables, graphite platens, three sanding drums with 80 grit
medium abrasive sleeves and 6" x 132" belt, sealed ball bearing idler pulley, rubber contact motor pulley, belt guard with
hinged end caps and instruction manual.
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GROUNDED OUTLET BOX
CURRENT
CARRYING
PRONGS
GROUNDING BLADE
IS LONGEST OF THE 3 BLADES
31-390 ONLY:
Use proper extension cords. Make sure your extension
cord is in good condition and is a 3-wire extension cord
which has a 3-prong grounding type plug and matching
receptacle which will accept the tool’s plug. When using
an extension cord, be sure to use one heavy enough to
carry the current of the tool. An undersized cord will
cause a drop in line voltage, resulting in loss of power
and overheating. Fig. C, shows the correct gauge to use
depending on the cord length. If in doubt, use the next
heavier gauge. The smaller the gauge number, the
heavier the cord.
EXTENSION CORDS
Fig. C
MINIMUM GAUGE EXTENSION CORD
RECOMMENDED SIZES FOR USE WITH STATIONARY ELECTRIC TOOLS
Ampere Total Length Gauge of
Rating Volts of Cord in Feet Extension Cord
0-6 230
up to
50 18 AWG
0-6 230 50-100 16 AWG
0-6 230 100-200 16 AWG
0-6 230 200-300 14 AWG
6-10 230
up to
50 18 AWG
6-10 230 50-100 16 AWG
6-10 230 100-200 14 AWG
6-10 230 200-300 12 AWG
10-12 230
up to
50 16 AWG
10-12 230 50-100 16 AWG
10-12 230 100-200 14 AWG
10-12 230 200-300 12 AWG
12-16 230
up to
50 14 AWG
12-16 230 50-100 12 AWG
12-16 230
GREATER THAN 100 FEET NOT RECOMMENDED
Fig. B
UNPACKING AND CLEANING
Carefully unpack the tool, two legs and all loose items
from the shipping container(s). Remove the protective
coating from all unpainted surfaces. This coating may be
removed with a soft cloth moistened with kerosene (do
not use acetone, gasoline or lacquer thinner for this
purpose). After cleaning, cover the unpainted surfaces with
a good quality household floor paste wax.
Fig. 2, illustrates the basic sander (A) removed from the
shipping container. Place the sander (A) on a supporting
surface that will hold 375 lbs., such as two saw horses,
which will allow safe and efficient assembly of the legs.
Fig. 2
A
CONNECT
THREE POWER
LEADS TO
TERMINALS
L1 - L2 - L3
AND GREEN
LEAD TO THE
GROUND
STRIP
GROUND
STRIP
BRING POWER
LEAD THRU
ENTRANCE
HOLE IN
BOTTOM OF
STA RTER
ENCLOSURE
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