Roper Whitney U616 User manual

MODEL NO. U616 UNIVERSAL FINGER BRAKE
OPERATION, PARTS & MAINTENANCE MANUAL
Model: Purchased From:
Serial #: Date Received:
MADE IN THE USA

Distributed by:
Trick-Tools
80 Truman Road
Pella, IA 50219
Phone:1-877-VAN-SANT
E-mail: [e-mail]
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ABOUT THIS MANUAL
CONTENT This manual contains information on the Roper Whitney floor mounted universal
finger brake for 16 gauge material, Model U616.
The contents include a machine description, safety precautions, instructions for
installation, adjustment, operation, maintenance, and repair; and a parts list
providing a listing of repair parts.
AUDIENCE The manual is written with the experienced sheet metal operator in mind. The
operator should be familiar with tooling, machine setup, materials, work
methods, and setup and finished product inspection. Experienced operators not
familiar with the equipment covered will be able to set up and run the machine
from the manual. Novice operators can be trained from the manual, but
additional instruction may be needed.
It is strongly recommended that anyone using the equipment covered read the
manual thoroughly, and understand the material presented.
INFORMATION The setup and operating instructions are based on the intended application of
USAGE the machine as defined by Roper Whitney. Use of the machine for other
applications is not precluded, but use for purposes specifically excluded is not
recommended, and may void warranty provisions.
Material in this manual is confidential, and Roper Whitney reserves all rights in
this regard.
ADDITIONAL If you have questions concerning usage or operating techniques not covered by
ASSISTANCE this manual, or if you encounter maintenance or repair problems, Roper Whitney
field service and product support personnel can provide you with assistance.
Before calling, please obtain the following information.
* machine type
* machine serial number
* description of application you wish to attempt
* description of problem you have encountered
Pageii

About This Manual ii
Warranty Provisions iv
Section 1: Safety Precautions 1
General Precautions ....................................................................................................................... 1
Safety Precautions During Operation.............................................................................................2
Section 2: Machine Description 3
Section 3: Specifications 4
Section 4: Receiving and Installation 5
Receiving ........................................................................................................................................ 5
Unloading........................................................................................................................................ 5
Unpacking ....................................................................................................................................... 5
Site Preparation .............................................................................................................................. 6
Setting the Brake ............................................................................................................................ 7
Leveling the Brake .......................................................................................................................... 7
Anchoring the Brake ....................................................................................................................... 7
Installing the Counterweights ......................................................................................................... 8
Section 5: Setup 9
Setting Clamping Pressure ............................................................................................................. 9
Adjusting for Material Thickness................................................................................................... 10
Setting Up for Narrow or Offset Bends......................................................................................... 11
Setting Up the Bend Angle Stop................................................................................................... 12
Section 6: Operation 13
General Instructions...................................................................................................................... 13
Clamping the Material ................................................................................................................... 13
Bending the Material..................................................................................................................... 14
Bending of Multiple Thicknesses .................................................................................................. 14
Hemming....................................................................................................................................... 15
Section 7: Periodic Maintenance 16
Lubricating Rotating Components ................................................................................................ 16
Lubricating Sliding Components................................................................................................... 16
Lubricating Adjusting Nuts and Screws........................................................................................ 16
Adjusting the Clamping Collars..................................................................................................... 17
Section 8: Maintenance Adjustments 18
Brake Crowning Adjustments ....................................................................................................... 18
Preloading Adjustment.................................................................................................................. 20
Section 9: Repair Parts List 22
TABLE OF CONTENTS
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Page iv
FOREWORD
Thismanualhas been preparedfortheowner and operatorsofRoperWhitney No. U616brake. Its
purpose,asidefrom operations instructions, istopromotesafety through the useofacceptedoperating
procedures. Readallinstructions thoroughlybeforeoperating thebrake.
Alsocontainedin this manualisthe parts listforyour brake. It isrecommendedthatonly RoperWhitney
orfactoryauthorized parts beusedas replacements.
Warranty Statement: 3 YEAR LIMITED WARRANTY
Roper Whitney (“Manufacturer”) warrants, commencing with the date of shipment to first end-user
(“Customer”) and for a period of thirty-six (36) months thereafter, all machinery and parts manufactured
by Manufacturer to be free of defects in workmanship and material. This warranty remains in force for
the above time period only if all of Manufacturer’s operational procedures are followed and
recommended maintenance is performed. If, within such warranty period, any machinery or parts
manufactured by Manufacturer shall be proved to Manufacturer’s satisfaction to be defective, such
machinery or parts shall be repaired or replaced, at Manufacturer’s option. All warranty claims are made
F.O.B Manufacturer’s plant, providing such machinery or parts are returned freight prepaid to
Manufacturer’s plant or designated service center for Manufacturer’s inspection. All failed parts or
components must be returned to Manufacturer prepaid for inspection before credit will be issued for new
parts or components. Manufacturer’s obligation hereunder shall be confined to such repair or replacement
and does not include any charges, direct or indirect, for removing or replacing defective machinery or
parts. No warranty shall apply to machinery, or parts or accessories, which have been furnished, repaired,
or altered by others so as, in Manufacturer’s judgment, to affect the same adversely or which shall have
been subject to negligence, accident or improper care, installation, maintenance, storage, or other than
normal use or service, during or after shipment. No warranty shall apply to the cost of repairs made or
attempted outside of Manufacturer’s plant or designated service center without Manufacturer’s
authorization. No warranty shall apply with respect to machinery or part not manufactured by
Manufacturer, including but not limited to motors, accessories, electrical and hydraulic components, if such
machinery or part is subject to warranty by the manufacturer of such machinery or part. No warranty
claims by Customer will be honored with respect to any machinery or part from which the name and date
plate has been removed or is otherwise no longer located or exhibited on such machinery or part. THE
FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY AND IMPLIED
WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. MANUFACTURER SHALL NOT BE SUBJECT TO
ANY OTHER OBLIGATIONS OR LIABILITIES WHATSOEVER WITH RESPECT TO MACHINERY, PARTS,
ACCESSORIES, OR SERVICES MANUFACTURED OR FURNISHED BY IT OR ANY UNDERTAKINGS, ACTS,
OR OMISSIONS RELATING THERETO. UNDER NO CIRCUMSTANCES SHALL MANUFACTURER BE
LIABLE FOR ANY CONSEQUENTIAL OR OTHER DAMAGES, EXPENSES, LOSSES, OR DELAYS HOW SO
EVER CAUSED.
THERE ARE NO WARRANTIES THAT EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF.
Note: Consumable tooling is not covered under the 3 year manufacturer’s warranty.
RETURN OF THE PRODUCT REGISTRATION CARD FURNISHED WITH THE PRODUCT IS NECESSARY TO OBTAIN
WARRANTY COVERAGE THEREON. CARD MUST BE FULLY COMPLETED, SIGNED BY THE PURCHASER, AND IF
APPLICABLE, SIGNED BY THE DISTRIBUTOR. RETURN REGISTRATION CARD TO:

SAFETY LABELS
Do not operate the U616 Brake without the proper safety labels in place. If your machine is
missingthefollowing labels,pleasecontact RoperWhitneyCo. oryourauthorizedRoper Whitney
distributortoorder.

SECTION 1
SAFETY PRECAUTIONS
Before using the Roper Whitney manual brake, carefully read and fully under
stand the safety precautions outlined in this section. GENERAL
PRECAUTIONS pertain to the general workplace, and to the attitudes and work
habits you bring to the job. SAFETY PRECAUTIONS DURING OPERATION
pertain to work on the brake, and are repeated in other areas of the manual
where they pertain.
Do not consider this section to be all-inclusive on the subject of safety. It is
intended to be a general guide to safety practices as they pertain to the
machines covered by this manual. No set of guidelines can substitute for a
common-sense, informed, proficient, safety-conscious attitude on your part.
GENERAL Notify management or supervision whenever you feel there is any hazard
PRECAUTIONS involving the equipment or the performance of your job.
Never permit untrained individuals to operate this equipment without close
supervision. Be sure you know and understand the task at hand, and the
hazards associated with it.
Observe and follow safety instructions for your work area. Pay special attention
to posted warnings, and warning labels on the equipment. Do not place speed
above safety.
Wear appropriate clothing. Loose or hanging clothing or jewelry, finger rings,
etc. can be hazardous. Use the appropriate safety equipment, such as eye and
hearing protection, and safety-toe shoes. If gloves are worn to protect from
cuts, be sure they are snug-fitting and not likely to be snagged by moving
equipment.
Keep the work area neat and orderly. Be sure it is well lit, that extra tools are
put away, trash and refuse are in the proper containers, and dirt, chips or debris
have been removed from the working areas of the machine. Be sure the floor
area is clean and dry, and that extension cords and similar trip hazards have
been removed.
Use the proper tools for the job. Inspect them before use to see that they are in
good working condition. Replace broken or defective tools and equipment.
Use only approved cleaning materials: do not use explosive or flammable liquids
to clean the machine. Discard used cleaning materials in the appropriate
containers.
Do not use compressed air to clean debris, chips, dirt, or grit from the machine,
or from your clothing. Remove chips and grit from the machine with a suitable
brush; never with your hands.
Page 1

SAFETY Do not attempt to operate the brake in excess of its rated capacity. Do not
PRECAUTIONS attempt to form wire, nails, rods or pipe on the machine.
DURING
OPERATION Avoid any pinch points created by movement of the machine's components.
Exercise care around the bending apron counterweights. Stand clear of the ends
of the brake during the bend cycle or whenever the bending apron is moved. Do not
loosen the set screws securing the counterweight rods while the bending apron is
in the vertical position.
WARNING
SERIOUS INJURY MAY OCCUR
The counterweight and rod can drop suddenly through the holder.
Always use the apron lift handles to apply the bending force. Under no
circumstances use the counterweight rods for leverage. Failure to heed this
warning can cause personal injury or damage to the counterweight rods.
Always stand clear of the apron lift handle travel arc during the bend cycle to
avoid being struck by the handles.
WARNING
SERIOUS INJURY MAY OCCUR
Avoid pinch points created by the clamping and bending components.
Always stand clear of clamping handles. If the brake has not been properly
adjusted for material thickness; clamping action on one end of the brake may
cause the opposite clamping handle to snap forward due to the twisting stress
created on the upper beam. (this can also indicate that the clamping collars
need adjustment. Refer to Section VII, Periodic Maintenance.) When
opening the upper beam make sure the handles are moved to the horizontal
position to avoid accidental forward movement of the handles caused by the
weight of the upper beam.
If you observe unusual noises or vibrations during machine operation, check the
machine condition immediately. Do not attempt to operate the equipment
further until the causes of unusual behavior have been found and corrected.
Page 2

SECTION 2
MACHINE DESCRIPTION
UPPER BEAM & CLAMP
TENSIONING MEMBERS
FINGERS
COUNTERWEIGHT
CLAMPING LEVER
Figure 1. Major Components of the Universal Finger Brake.
Page 3
Roper Whitney floor mounted Universal Finger Brakes are precision machines
for use in bending mild steel and other sheet metals, including aluminum, brass,
bronze, copper, duralumin; lead, monel metal, silver, carbon and stainless steel
within rated capacity.
The brakes are rated to form a 1” minimum wide flange over entire length of
brake on a single thickness of material of the rated gauge capacity with work
angle support installed. Bending capacities are reduced by four (4) gauges
when the apron work support is removed.
Major components are shown in Figure 1.
Fabricated of sturdy steel plate with appropriate gussets, braces and trusses;
three basic longitudinal members (upper-beam, lower-beam and bending leaf/
apron) control the clamping pressure and stress incurred in overcoming the yield
strength of the material being formed. Provisions for adjusting clamping force
and tensioning of the longitudinal members are incorporated in the design of the
bending brakes.
COUNTERWEIGHT
CLAMPING LEVER
BENDINGAPRON
TENSIONING MEMBERS
LOWER BEAM AND
MACHINE BED

SECTION 3
SPECIFICATIONS
FEATURE MODEL U616
Bed Length 73 in.
Capacity on mild steel, 1” flange
With bending bar and angle in place 16 Ga.
With bending angle removed 20 Ga.
With bending bar and angle removed 24 Ga.
Minimum Reverse Bend (bending bar and angle removed) 1/4 in.
Maximum lift of beam 1 5/8 in.
Front to Rear Adjustment of Beam 1 1/8 in.
Approximate Shipping Weight 1350 lbs.
Packing Heavy wood skids and blocking with a plastic cover
Page 4

SECTION 4
RECEIVING AND INSTALLATION
RECEIVING When you receive your finger brake, check immediately for obvious damage,
which may have occurred during transit, to the skidding material or to the brake
itself. Also check to see that all material listed on the bill of lading is present.
Since Roper Whitney equipment is normally sold F.O.B., factory in Rockford, IL,
our responsibility for transit damage ceases when the transportation company
signs the bill of lading indicating it has received the items listed in good
condition.
Report discovered damage or shortages to the carrier. Make a notation on the
delivery waybill, and have the delivering driver sign it, acknowledging the
damage or shortage.
Submit claims for repair or replacement to the carrier; include any extra shipping
charges. Notify Roper Whitney Company promptly of any damage or shortages.
If you discover concealed damages or shortages after the carrier has departed,
you may still file a claim for concealed damage. This should be done as quickly
as possible. Again, notify Roper Whitney Company promptly of such damages
or shortages.
UNLOADING The brake is shipped on a skid of 3" x 6" wood timbers. It is secured to this skid
with four (4) carriage bolts, which should remain secured while the machine is
unloaded and moved about. The skid and brake may be moved using a suitable
fork lift.
WARNING
WHEN IN MOTION, THE SKIDDED BRAKE MAY BE TOP HEAVY
When lifting or moving the skidded brake with a forklift, secure the brake laterally to
the forklift.
UNPACKING The two counterweight arms (rods) and their counterweights are mounted
separately on the wooden skid for shipment. Remove these from the skit and
set to one side.
WARNING
THE COUNTERWEIGHT ARMS AND COUNTERWEIGHTS ARE
HEAVY
Use care when removing them from the skid to avoid injury.
Page 5

The clamping handles at each end of the brake are wrapped and wired in the down
position to prevent damage and to prevent the handles from being used to move
the brake. Remove the wires and wrapping.
Wooden blocks are positioned between the upper and lower beam jaws to prevent
damage during shipment. Lift the clamping handles and remove the blocks.
The bending leaf (apron), is wired to the center truss stud of the lower beam to
prevent movement during transit. Remove the wire.
Remove the four (4) carriage bolts, nuts, and washers securing the brake to the
skidding. DO NOT REMOVE THE BRAKE FROM THE SKID AT THIS TIME.
WARNING AND CAUTION
SERIOUS INJURY CAN RESULT OR THE BENDING BRAKE CAN BE DAMAGED
Do not operate the brake on the skid. The brake must be attached to the floor.
The machine is top heavy and can tip if not securely anchored. The skid does
not provide a suitable anchoring platform.
SITE The brake must be placed on a firm floor which does not sag and which does
PREPARATION not have any “spring” to it. The floor must be generally level, with no twisting or
unevenness in the surface. The floor must also be capable of accepting 1/2” lag
screws or bolts for the purpose of securing the brake.
There must be adequate area around the brake for free movement of the
operator and the handling of large sheets of metal. Allow 4 to 6 feet behind the
brake, 6 to 8 feet in front of the brake, and 3 feet on either end of the brake.
To move the brake off the skid, and to its mounting position, use an overhead
crane or a fork lift with the forks above the brake. If a fork lift is used, secure a
lifting hook on the lift forks. Pass a sling under brake and secure each end on
the lifting hook as shown in Figure 2.
CAUTION
THE BENDING BRAKE CAN BE DAMAGED
Do not move the brake using lift truck forks directly under any machine members.
Page 6

SETTING THE Using the overhead crane, lift the brake from the skid and place it in its desired
BRAKE location. Be sure the brake is properly balanced.
WARNING
THE BRAKE TENDS TO BE TOP HEAVY AND CAN TWIST
IN THE SLING
Use care when moving the brake from the skid to avoid injury.
Figure 2. The proper lifting method for moving the brake.
LEVELING THE Raise the upper beam to its maximum height using the eccentric lifting levers.
BRAKE (See Figure 2) Place an accurate spirit-level on the bed at each end of the bar.
Shim under the legs of the brake until the bed bar shows the machine is level
front-to-rear. This will remove any twist from the bed. Side-to-side leveling is
not necessary to proper operation of the brake.
ANCHORING THE Anchor the leveled brake to the floor using 1/2” lag screws or bolts through the
BRAKE leg mounting holes. Tighten securely, making sure pressure is exerted on the
leveling shims.
Page 7

INSTALLING THE Have an assistant raise the bending apron to the horizontal position, and hold it
COUNTER- in that position while the counterweights hare installed.
WEIGHTS Install a counterweight in the mounting hole in each end of the bending apron.
Adjust the counterweights so that they balance the bending apron in the
horizontal position.
Tighten two set screws securely on each counterweight shaft.
WARNING
THE COUNTERWEIGHTSARE HEAVY
Use care when installing the counterweights to avoid injury. Be sure the set screws
are tightened enough so the counterweights will not drop when the bending apron
is returned to the vertical position.
Page 8

SECTION 5
SETUP
Your new Roper Whitney Brake is pre-set and should not require field
adjustment. The machine has been adjusted and pretensioned at the
factory.
SETTING Excessive clamping pressure is not required or desirable. It has a tendency to
CLAMPING counteract the normal preloading adjustments and may interfere with obtaining
PRESSURE straight and uniform bends. Use only enough clamping pressure to keep the
material from slipping.
TOGGLE ASSEMBLY
UPPER TOGGLE
PIN LOCK NUT
TOGGLE ANCHOR
LOWER TOGGLE
PIN LOCK NUT
Figure 3. Clamping Pressure Adjustments.
Be sure the gauge thickness of the material to be formed to is within the rated
capacity of the machine. Then adjust clamping pressure as follows:
1. At each end of the brake, loosen both toggle pin lock nuts slightly before
beginning adjustment (see Figure 3).
2. Place small sample pieces of the material to be formed between the
upper beam radius bar and the bed at each end of the machine. Clamp
in position.
3. At each end of the machine, tighten the lower toggle pin lock nut against
the toggle anchor just enough to hold material firmly when the clamping
lever is against the forward stop (see Figure 3).
Set-up adjustments are for clamping pressure, material thickness, setting up for
narrowor offset bends, setting bend angle control, and setting up of the optional
rear material stops.
Should your brake require adjustment, follow instructions below:
Page 9
CLAMPING LEVER

SETTING 4. At each end of the machine, tighten upper toggle pin lock nut against the
CLAMPING toggle anchor (see Figure 3).
PRESSURE 5. At each end of the machine, pull the clamping lever forward against the
stop. Each end should require equal effort. Adjust one end, if
necessary, according to the general procedure above.
ADJUSTING FOR Under normal circumstances, clearance between the apron edge and the upper
MATERIAL beam radius bar should be approximately (2) times the material thickness for 16
THICKNESS ga. mild steel. For lighter gauge material, less clearance is required. One and
a half (1 1/2) times material thickness is usually sufficient. Soft material, such
as aluminum, may be formed with a clearance equal to the material thickness.
CAUTION
THE BENDING BRAKE CAN BE DAMAGED
Clearance must never be less than the material thickness.
Make the adjustment as follows:
1. With the upper beam lowered to the normal operating position, but not
clamped tightly against the bed, loosen the thickness adjustment
clamping screws located on both ends of the brake (see Figure 4).
2. Raise the apron to the 90 degree position.
CLAMPING LEVER
ANGLE STOP
STUD
THICKNESS ADJUSTMENT
CLAMPING SCREW
THICKNESS
ADJUSTMENT
SCREW
ANGLE STOP COLLAR
ANGLE STOP COLLAR
SET SCREW
ANGLE STOP ROD
Page 10
Figure 4. Material Thickness and Angle Adjustments.

ADJUSTING FOR 3. Move the upper beam forward or back until proper clearance is achieved
MATERIAL by turning the thickness adjusting screw located at rear of the leg bracket
THICKNESS on each end of the machine (see Figure 4). Final adjustment must
always be toward the front of the brake to remove backlash from the
adjusting screws.
4. Retighten the clamping screw on each end of the machine (see
Figure 4).
SETTING UP It is sometimes necessary to remove the bending reinforcing angle to make
FOR NARROW narrow or offset bends. In extreme conditions, it may also be necessary to
OR OFFSET remove the bending bar. The bending bar is made of tough, wear resistant
BENDS material to protect the edge of the apron and should be removed only when
absolutely necessary to make tight reverse bends.
Removing the bending reinforcing angle reduces capacity by four (4) gauges.
The rated 16 ga. capacity is reduced to 20 ga. capacity. Removing both the
bending reinforcing angle and the bending bar reduces the 16 ga. capacity to
24 gauge capacity.
BENDING REINFORCING
ANGLE
BENDING BAR
(LOCATED BEHIND THE
BENDING REINFORCING
ANGLE)
Figure 5. Removal of the Bending Reinforcing Angle and the Bending Bar
Remove the bending reinforcing angle and the bending bar as follows:
1. Support the bending reinforcing angle and remove retaining screws.
Withdraw the angle from the machine (see Figure 5).
2. Support the bending bar and remove retaining screws. Withdraw the bar
from the machine (see Figure 5).
3. After the bending operation is complete, be sure to replace the removed
components, attaching them with the retaining screws. Tighten the
screws securely.
Page 11

SETTING UP THE The bend angle stop can be adjusted for multiple or precision bends. Adjust the
BENDANGLE angle stop as follows:
STOP 1. Loosen the angle stop collar set screw and move the angle stop collar
out toward the end of the angle stop rod. (See Figure 4.)
2. Have an assistant move the apron to the desired position and hold it
while you adjust the collar. Be sure to take spring-back into account
when setting the angle.
3. Move the angle stop collar against the angle stop stud and tighten the
angle stop collar set screw to retain it in that position.
Page 12

SECTION 6
OPERATION
GENERAL Operation of the brake is entirely manual, and the operator has full control of the
INSTRUCTIONS operation at all times.
Do not attempt to operate the brake in excess of its rated capacity. Do not
attempt to form wire, nails, rods or pipe on the machine.
If you are bending large sheets of material which are difficult to handle, you may
wish to use an assistant to help in loading, clamping, and bending.
If you observe unusual noises or vibrations during machine operation, check the
machine condition immediately. Do not attempt to operate the equipment
further until the causes of unusual behavior have been found and corrected.
WARNING
PINCH POINTS CAN CAUSE SERIOUS INJURY
Avoid any pinch points
created by movement of the machine’s components.
CLAMPING THE Insert the material to be bent under the upper beam clamping mechanism, lining
MATERIAL up both sides so they are even with the upper beam. Position short pieces of
material in the center of the brake to equalize strain during bending.
Clamp the material by lowering the upper beam with the clamping levers.
If the brake has not been properly adjusted for material thickness; clamping
action on one end of the brake may cause the opposite clamping handle to
snap forward due to the twisting stress created on the upper beam.
When opening the upper beam make sure the handles are moved to the
horizontal position to avoid accidental forward movement of the handles caused
by the weight of the upper beam.
WARNING
THE UPPER BEAM CLAMPING MECHANISM CAN CAUSE SERIOUS
INJURY
Always stand clear of the clamping handles. Do not place fingers near
or under the upper beam.
Page 13

BENDING THE Bend the material to the desired bend angle using the apron lift handles to apply
MATERIAL the bending force. Under no circumstances use the counterweight rods for
leverage.
If the material being bent is long and protrudes from the machine, lift it during
the bending operation to avoid creases or crimps caused by material weight.
WARNING
THE COUNTERWEIGHTSAND CLAMPING HANDLES
CAN CAUSE INJURY
Always stand clear of the ends of the brake during the bend cycle.
Always stand clear of the apron lift handle travel arc during the bend cycle.
CAUTION
THE COUNTERWEIGHT RODS CAN BE DAMAGED
Using the counterweight rods to apply bending force can damage them.
BENDING OF To avoid adjusting for every piece on a run of parts, do all the single-thickness
MULTIPLE bending operations first, then adjust and do the multiple thickness bending.
THICKNESSES Never bend against hems or seams until an adjustment has been made to
compensate for the clamping of multiple thicknesses of material. Never bend
against hems or seams until the upper beam is set back for clearance of the
multiple thicknesses of material. See SETUP, SECTION 5, for adjustment
instructions.
CAUTION
MACHINE COMPONENTS CAN BE DAMAGED
Failure to compensate for multiple thicknesses of material may result
in breakage of the clamping mechanism.
Failure to set the upper beam back for extra clearance may result in
indentations on the upper beam jaw.
Page 14