Original Saw Company 3691-01-03 User manual

This manual is provided for your convenience in the use
and care of your saw. These instructions include opera-
tion, precautions, preventative maintenance and other
pertinent data to assist you in assuring long life and de-
pendable service from your saw.
WARNING: FOR YOUR SAFETY READ AND UNDERSTAND THIS MANUAL
PRIOR TO USING THE SAW. REVIEW ALL SAFETY RULES AND OPERATING
INSTRUCTIONS FREQUENTLY.
Horizontal Beam Saw
TYPE 3
16” models 3691-01-03
20” models 3691-01-05
22.5” models 3691-01-07
For Serial number 20230350092 forward
(May 2023)
Made in USA
Operations & Maintenance Manual
Original Saw Company
465 Third Ave SE
Britt, IA 50423 USA
PH 641-843-3868
Getting Started
Unpacking, general machine precautions, wiring,
installation

Serial Nu
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TABLE OF CONTENTS
SECTION PAGE
Service Record ……………………………………………………………………………. 2
Warranty Information ……………………………………………………………………… 3
Power Tool Safety ……………………………………………………………….………… 4-5
Preventative Maintenance …………………………………………………………….. 5- 6
Symbols / Decals ………………………………………………………………………….. 7
Decal Locations ……………………………………………………………………………. 8-9
Saw Components and Controls ……………………………………………………..….. 10-11
Product Specifications …………………………………………………………………....10-11
ANSI Conformance ………………………………………………………………….…….. 12
Saw Assembly and Installation …………………………………………………....……..13-17
Electrical Connections ………………………………………………………….... 14-16,29-30
Arbor Rotation ……………………………………………………………....……….…… 14
Changing Motor Voltage …………………………………………………….………... 14, 29
Operating Instructions ………………………………………………………………...….18- 22
Industrial Use Warranty Information
Your new Original Radial Arm Saw is precision manufactured under strict quality standards. In the un-
likely event there is trouble with your machine, the Original Saw Company warrants the machine for the
period of one year from the date of purchase. The warranty covers defects in materials and workman-
ship. We will cover the cost of the defective part and ground shipping. If a replacement part is sent
under warranty the defective part must be returned to Original Saw Company or you will be charged for
the replacement. The part must also be accompanied by a return goods authorization number. This
number can be obtained by calling customer service at 1-800-733-4063. When the part is returned it
may be repaired or replaced at our discretion. The part must be shipped prepaid to: The Original Saw
Company, Attn. Warranty Replacement Counter, 465 Third Avenue SE, Britt, Iowa 50423.

GENERAL RULES FOR SAFE OPERATION OF POWER TOOLS
1. KNOW YOUR POWER TOOL. Read the owner’s manual carefully. Learn the applications and
limitations as well as the specific potential hazards of the tool.
2. GROUND ALL TOOLS.
3. KEEP GUARDS IN PLACE. Keep guards in working order.
4. KEEP WORK AREA CLEAN. Cluttered areas and benches invite accidents.
5. AVOID DANGEROUS ENVIRONMENTS. Don’t use power tools in damp or wet locations. Keep
work area well lit.
6. KEEP CHILDREN AWAY. All visitors should keep a safe distance from the work area.
7. DON’T FORCE TOOL. The tool will do a better job if used at its designed rate.
8. WEAR PROPER APPAREL. Loose clothing, gloves or jewelry may get caught in moving parts.
Rubber footwear is recommended when working outdoors.
9. USE PROTECTIVE GLASSES. If operation is dusty also wear a dust mask.
10. DON’T OVER REACH. Keep proper balance and footing at all times.
11. MAINTAIN TOOLS WITH CARE. Tools kept sharp and clean provide the best and safest
performance. Follow instructions for lubricating and changing accessories.
12. DISCONNECT TOOLS FROM POWER SOURCE. When not in use, before servicing, when changing
accessories, blades, or cutters, the tool should be disconnected and locked out.
13. REMOVE ADJUSTING KEYS AND WRENCHES. Make it a habit to ensure keys and adjusting
wrenches are removed prior to starting tool.
14. USE RECOMMENDED ACCESSORIES. Consult your distributor or Original Saw Company for
recommended accessories. Using improper accessories may cause hazards.
15. SECURE YOUR WORK. Use clamps or a vise to hold work when practical.
16. NEVER LEAVE TOOL RUNNING WHILE UNATTENDED.
17. ONE OPERATOR ONLY. The person who operates the saw should also position the work.
18. DO NOT REMOVE SMALL SCRAPS FROM THE TABLE WITH YOUR FINGERS.
POWER TOOL SAFETY
CAUTION
NOTE:
This manual is not totally comprehensive. It does not and
cannot cover every possible safety and operational factor

Modifications:
 • Any modifications to the machine including in-
corporation into an assembly, addition of integrat-
ed feeds or other changes are the responsibility of
the end user and the end user must ensure ongo-
ing compliance.
Additional Safety Actions to be Take by End
User
 • Lock out Tag out procedures to be adopted dur-
ing all maintenance.
 • Lock out Tag out procedures to be observed
when changing blade
Functional Testing
 • Braked run down times test—tested monthly
(30 second brake run down )
Instructions for Use:
 • Always observe the safety instructions and
applicable regulations.
 • Ensure the material to be sawn is firmly secured
in place.
 • Apply only a gentle pressure to the tool and do
not exert side pressure on the saw blade.
 • Avoid overloading.
 • Install the appropriate saw blade.
 • Do not use excessively worn blades.
 • The maximum rotation speed of the tool must
not exceed that of the saw blade.
 • Do not attempt to cut excessively small pieces.
 • Allow the blade to cut freely. Do not force.
 • Allow the motor to reach full speed before
cutting.
Preventative Maintenance
Original Radial Arm Saws are designed to provide
you with precision cutting with a minimal amount
of maintenance. The frequency of the mainte-
nance depends on the amount of use and the
desired cutting quality.
Always disconnect and lockout power supply
before performing maintenance.
Daily
 • Wipe down the machined tracks in the arm,
this will prevent wood pitch buildup on the
machined surfaces
 • Dust off and remove excess saw dust
Monthly
 • Repeat daily tasks but use denatured alco-
hol or paint thinner to wipe down tracks
 • Remove arbor nut, collars, and saw blade.
Inspect the saw blade teeth for sharpness
and broken tips. Replace or re-sharpen as
necessary
 • Remove end cap and remove carriage and
rest on the table (do not remove wiring) then
wipe off the bearings with denatured alcohol
or paint thinner to remove all wood pitch
buildup, DO NOT lubricate the tracks this will
case premature track wear due to sawdust
sticking to the tracks.
 • Inspect arbor, are the arbor bearings still
tight and free of play? If not then they will
need to be replaced by a technician or at a
electric motor shop.
 • Inspect all wiring to check for cracks, re-
place if worn or cracked.
 • Using compress air blow out the cooling
ducts in the motor by blowing through from
the arbor side of the motor to the back o the
motor, (use Personal Protection equipment ie

MANTAINENANCE RECORDS
Preventative Maintenance … Continued
 • After many years of use your saw may need
replacement parts. If any of the following
wears out all others listed should be checked
also.
 • Roller head bearings: Check for free, smooth
rotation. Do not attempt to lubricate.
 • Arm Tracks: If the saw is used primarily for
short cut-offs, the tracks may wear making it
difficult to adjust the roller head bearing for full
length arm travel. Arms can generally be re-
machined—contact Original Saw for pricing
and shipping instructions.
 • Motor bearings: Check for free, smooth rota-
tion. Do not attempt to lubricate.
Use this space to record service or use
page 2 for a more detailed recording for
your Original radial arm saw.

SYMBOLS / DECALS
Always replace damaged, missing, or illegible decals.
Contact Original Saw at 641.843.3868 for replacement
parts.
6
.
Denotes hearing and eye
protection required.
7
.
Denotes guards required to be
in place.
8
.

Denotes general safety hazard.
See operators manual for more
information pertaining to these
areas.
9
.
Denotes lift point.

Denotes risk of injury, loss of life,
or
damage to the tool in case of not
observing the instructions in this
Denotes risk of electrical shock.
Denotes risk of pinching hazard.
Denotes hazard of rotating
blade.
Denotes hazard of entangle-
ment.
1
.
2
.
3
.
4
.
5
.

SYMBOLS / DECALS
Guard:
Index # 4 Hazzard Rotating blade
# 6 Hearing and eye protection
# 7 Guards required to be in place
- rotation direction
- use blades rated at 3600 rpm
Beam:
 #8 denotes general caution
safety hazards
 #7 denotes guards required to
be in place
 #6 denotes eye and hearing
protection required.
Frame:
Index # 9 Denotes lift point
Note there are 2 on front of frame
Caution
E-stop yellow Surround
Caution
# 3 denotes a pinch point between
bevel stop and roller head
# 5 denotes hand entanglement

SYMBOLS / DECALS
Frame:
Index # 9 Denotes lift point
Note there are 2 on front of frame
Caution
# 5 denotes hand entanglement .

Frame: machine frame and legs
Fence—for material being
cut to be placed against
Power feed cam track rails and rear
stop.—to control length of cross cut
travel
Components and Controls
Limit switch –power feed
system
Power feed cam track rails and
front stop.—to control length of
cross cut travel
Fence clamps—to allow
for fence to be moved or
repositioned.
Power feed drive motor and
gearbox assembly.

Components and Controls
Pneumatic clamping cylinders
Chain Guard for carriage drive chain
Fence—for material being cut to be placed
against
Mist coolant tank

SAW ASSEMBLY AND INSTALLATION

L1,L2,L3
PowerInfrom
T1,T2,T3
PowerInfrom
DCpowersupply
Voltagespecific
Thermaloverload
Thermalseng
Resetbuon(C)
Check Arbor Rotation (3 Phase Only)
Check arbor rotation with arbor nut and arbor collars removed. Open line disconnect to the saw to remove arbor nut and collars, close the line
disconnect and start saw. The rotation of the arbor must be clockwise as indicated on the arrow on the nameplate. If the rotation is counterclock-
wise, the incoming wires are not properly connected to the switch box. To change the direction reverse any two of the wires leading to the switch
box from the power supply.
Changing Voltage on dual voltage motors and Resetting Thermal Protection
Dual voltage motors can be operated on either of the two voltages indicated on the motor nameplate. The voltage setting from
the factory can be found on the tag attached to the guard stud. Note Ty3 and newer models have DC power supplies that are
voltage specific. To change the voltage:
1. Change the motor lead connections as shown on the diagram on the inside cover of the motor con-
duit box. This is also found on page 29-30 in this manual. Disconnect and lockout the power sup-
ply before attempting voltage change.
2. Change the DC power supply to the proper input voltage Note: power supplies are voltage specific
and cannot be adjusted from 230 volt to 460 volt primary voltage. This is also found on pages 24-
25 of the parts manual.
3. Replace or adjust the thermal overload protectors (D) using dial (A), see figures below) with those
rated at the desired amperage range. If the overloads trip you will need to press reset button (C)
to resume operation or set the thermal for auto-reset.
4. Contact your dealer or customer service via phone at 800-733-4063 or email at
[email protected] for correct information on thermal overload protectors.
Overload Protection
Your saw is equipped with automatic reset thermal overload protection. To restart after thermals have tripped, wait
until the motor cools, then press the saw start button. If overloads continue to trip, the machine is being overload-
ed. Do not continue to operate under these conditions. This could indicate an electrical problem take the time to find
the trouble and correct it—see the electrical trouble shooting section of this manual. The main power supply branch
circuits should be fused by the use of fuses or breakers as follows using time delay fuses:

SAW ASSEMBLY AND INSTALLATION
Connecting Electrical Current
The motor is properly connected to the VFD at the factory for operation on the electrical voltage
specified. Make sure incoming voltage from your power supply conforms to the voltage specified
on the cover of VFD enclosure.
Open the power feed / VFD enclosure cover and insert power supply cable (customer supplied
hole). Connect wires to the terminal strip marked “incoming power” 3 phase; Attach the ground
wire to the ground lug inside enclosure. Do not attach any wire anywhere else in the enclosure.
Wiring must conform to the National Electrical Code and any applicable local codes.
Saws equipped with Variable Frequency Drives and power feed unit
R/L1 S/L2
Incoming power
Ground bar

Recommend Copper Wire Sizes (A.W.G.)
To obtain maximum efficiency from your saw motor, the feeder wire from the power source to the machine should comply with the table below.
Electrical Connection—
Recommended Copper Wire Sizes 
1 Phase 3 Phase 3 Phase 3 Phase
Up to 60' from power supply 200-240 V 200-240 V 440-480 V 550-600 V
3 hp #8 AWG #8 AWG #10 AWG #10 AWG
5 hp #6 AWG #8 AWG #10 AWG #12 AWG
7.5 hp N/A #6 AWG #8 AWG #10 AWG
 
60 - 100' From power supply 200-240 V 200-240 V 440-480 V 550-600 V
3 hp #6 AWG #6 AWG #8 AWG #10 AWG
5 hp #2 AWG #6 AWG #6 AWG #8 AWG
7.5 hp N/A #4 AWG #6 AWG #6 AWG
 
100 - 160' From power supply 200-240 V 200-240 V 440-480 V 550-600 V
3 hp #4 AWG #4 AWG #6 AWG #8 AWG
5 hp #0 AWG #2 AWG #6 AWG #6 AWG
7.5 hp N/A #2 AWG #4 AWG #6 AWG
 
Over 160' From power supply 200-240 V 200-240 V 440-480 V 550-600 V
3 hp #2 AWG #2 AWG #4 AWG #4 AWG
5 hp #00 AWG #2 AWG #2 AWG #4 AWG
7.5 hp N/A #0 AWG #2 AWG #2 AWG
Recommended Fuse / Breaker Size 
(Locatedinthedisconnectenclosure)1 Phase 3 Phase 3 Phase 3 Phase
200-240 V 200-240 V 440-480 V 550-600 V
3 hp 60 AMP 20 AMP 20 AMP 20 AMP
5 hp 90 AMP 30 AMP 20 AMP 20 AMP
7.5 hp N/A 45 AMP 20 AMP 20 AMP

instructions for Changing the Motor Voltage
1) Disconnect and lockout power– Electrical shock could occur if this is not done.
2) Reconnect motor and transformer leads as shown in the chart above to match
your required voltage. Paying careful attention to make sure the brake coil lines are
still attached to motor leads #7 and #8.
3) Reset the dial for the proper amperage setting shown in the chart above. If your
Changing the Motor Voltage
If your machine requires a different voltage, follow the instructions below. The motor will
need to be rewired according to the diagrams below. The thermal overloads must be reset
or replaced with the proper pieces to maintain thermal motor protection.
Motorleadwiringdiagram

Mounting the Blade (Caution! Disconnect power source before mounting blade)
1. Place the hex box wrench over the arbor nut and place the long allen wrench in the arbor shaft end
hole. Place a wood striking block under the allen wrench to avoid marring the tabletop. Push down on
the hex wrench to loosen nut (left hand thread). (See figure 2)
2. Remove the nut and first arbor collar. Wipe the arbor collar faces and mounting area on the blade.
Guard Mounting note guard is installed when machine is shipped
(Caution! Disconnect/lockout power source before mounting guard)
See parts listing and diagram on page 26
1. Remove the 1/4”x 20 Hex nut from the right front lower guard mounting stud and remove the retainer
washer.
2. Remove the right lower guard by sliding it backward and down.
3. Place the guard over the blade, tilting the guard to the right so the HDPE lower guard sections
clears the end of the arbor.
FIGURE 1 FIGURE 2
Adjusting the Saw Guard
The guard can be pivoted by loosening the (2) nuts on back of guard mounting bracket .
CAUTION—DO NOT ADJUST THE GUARD, OR ANTI-KICKBACK WHILE BLADE IS
MOVING. KEEP ALL ADJUSTING MECHANISMS TIGHT.
SAW ASSEMBLY AND INSTALLATION
!Caution disconnect / lock out power source before mounting blade!
!!! CAUTION !!!
FOR ILLUSTRATION PURPOSES ONLY , THE GUARDS HAVE BEEN REMOVED FOR THE PHOTOS USED IN THIS
MANUAL. IN ACTUAL USE BOTH UPPER AND LOWER GUARDS MUST REMAIN IN PLACE FOR SAFE CUTTING

General Safety Precautions
1. Be sure the blade rotates clockwise when facing the saw from the left side. Blade must rotate to
the front of the saw.
2. Be sure all clamp handles are tight before turning motor on.
3. Keep the blade sharp and properly set.
4. Hold material firmly against the guide strip when cutting.
5. Be sure the blade and arbor collars are clean and the recessed side of the collars are against
blade.
6. Never oil or grease arm trackways or motor.
7. Do not start machine without proper tool guard.
8. Keep motor air slots clean.
9. Return roller head to full rear after each operation.
General Cautions When Using the Lower Blade Guard:
1. The lower blade guard will provide protection from contact with the side of the blade. It is not
designed to prevent contact with the front or rear of the blade. When the lower guard contacts
the fence or material being cut it will rise up exposing the blade. Be careful to keep your hands
out of the line of the cut.
2. Lower blade guards may become caught in prior kerfs in the fence or table. Replace guide fence
frequently. If guard becomes caught stop saw before attempting to remove.
3. Short cut-off pieces of wood may become caught between the lower guard and the blade. If this
happens shut off the saw and wait until blade stops to remove the piece.
4. The lower blade guard’s effectiveness is limited in bevel operations. It may have to be raised out
of the way when setting the bevel angle. Be sure the power is off/locked out and blade is
completely stopped before making any adjustment.
5. Catching the lower guard in saw kerfs when changing the saw setup can be avoided by elevating
the saw until the bottom of the guard clears the fence.
6. When ripping narrow strips the lower guard may have to be raised to rest on top of the guide
fence. Be sure to use a pusher stick to feed the work.
Operating Instructions

Revolving the Motor Vertically in the
Yoke
Raise the arm to allow the saw blade sufficient
clearance above the table top. Release the
bevel clamp handle , grasp the saw guard
with the left hand and lift the bevel latch han-
dle. The motor can now be swung to a bevel
position as indicated on the bevel scale. Lock
Bevel latch
Bevel clamp
standard manual
clamp / material stop …. continued
During operations where the arm is swung left
or right could put the clamp in the path of
the blade. If this is going to happen simply
add scrap board that will allow the clamp to
be moved further out on the table and clear
the blade path. (Red arrow 1)
Operating Instructions * Note some photos show radial arm saw for
pictorial purposes
1
2