Jet MBS-827DGVI, MBS-823DGVI Operating Instructions Manual

MBS-823DGVI / MBS-827DGVI

GB - ENGLISH

Operating Instructions

Dear Customer,
Many thanks for the confidence you have shown in us with the purchase of your new JET-machine. This manual has been

prepared for the owner and operators of a JET MBS-823DGVI / MBS-827DGVI metal band saw to promote safety during
installation, operation and maintenance procedures. Please read and understand the information contained in these operating
instructions and the accompanying documents. To obtain maximum life and efficiency from your machine, and to use the
machine safely, read this manual thoroughly and follow instructions carefully.

…Table of Contents

1. Declaration of conformity

2. Warranty

3. Safety

4. Machine dimensions, Transport, Installation and
Dismantling

5. Functional parts of the machine

6. Wie man die Bandsäge korrekt verwendet

7. So stellen sie ihre Maschine richtig ein

8. Routine und Sonderwartungen

9. Technische Daten

10. Wahl des Sägebandes

11. Umweltschutz

12. Lieferbares Zubehör

13. Fehlersuche

1. Declaration of conformity

On our own responsibility we hereby declare that this
product complies with the regulations* listed on page 2.
Designed in consideration with the standards**.

2. Warranty

The Seller guarantees that the supplied product is free
from material defects and manufacturing faults. This
warranty does not cover any defects which are caused,
either directly or indirectly, by incorrect use,
carelessness, accidental damage, repair, inadequate
maintenance or cleaning and normal wear and tear.

Guarantee and/or warranty claims must be made within
twelve months from the date of purchase (date of
invoice). Any further claims shall be excluded.

This warranty includes all guarantee obligations of the
Seller and replaces all previous declarations and
agreements concerning warranties.

The warranty period is valid for eight hours of daily use. If
this is exceeded, the warranty period shall be reduced in
proportion to the excess use, but to no less than three
months.

Returning rejected goods requires the prior express consent
of the Seller and is at the Buyer’s risk and expense.

Further warranty details can be found in the General Terms
and Conditions (GTC). The GTC can be viewed at

www.jettools.com or can be sent by post upon request.

The Seller reserves the right to make changes to the product
and accessories at any time.

3. Safety

3.1 Authorized use

This machine is designed for sawing machinable metal and
plastic materials only.
Machining of other materials is not permitted and may be
carried out in specific cases only after consulting with the
manufacturer.

Never cut magnesium-high danger to fire!

The workpiece must allow to safely be loaded and clamped
for machining.

The proper use also includes compliance with the operating
and maintenance instructions given in this manual.

The machine must be operated only by persons familiar with
its operation and maintenance and who are familiar with its
hazards.

The required minimum age must be observed
The machine must only be used in a technically perfect

condition.
When working on the machine, all safety mechanisms and

covers must be mounted.
In addition to the safety requirements contained in these

operating instructions and your country’s applicable

regulations, you should observe the generally recognized
technical rules concerning the operation of metalworking
machines.

MBS-823DGVI / MBS-827DGVI

Any other use exceeds authorization.
In the event of unauthorized use of the machine, the
manufacturer renounces all liability and the responsibility
is transferred exclusively to the operator.

3.2 General safety notes

Metalworking machines can be dangerous if not used
properly. Therefore the appropriate general technical
rules as well as the following notes must be observed.

Read and understand the entire instruction manual before
attempting assembly or operation.

Keep this operating instruction close by the machine,
protected from dirt and humidity, and pass it over to the
new owner if you part with the tool.

No changes to the machine may be made.
Daily inspect the function and existence of the safety

appliances before you start the machine.
Do not attempt operation in this case, protect the
machine by unplugging the mains cord.

Remove all loose clothing and confine long hair.
Before operating the machine, remove tie, rings, watches,

other jewellery, and roll up sleeves above the elbows.
Wear safety shoes; never wear leisure shoes or sandals.

Always wear the approved working outfit
Do not wear gloves while operating this machine.
For the safe handling of saw blades wear work gloves.
Wear goggles when working
Install the machine so that there is sufficient space for

safe operation and workpiece handling.
Keep work area well lighted.
The machine is designed to operate in closed rooms and

must be placed stable on firm and levelled ground.
Make sure that the power cord does not impede work and

cause people to trip.
Keep the floor around the machine clean and free of

scrap material, oil and grease.
Never reach into the machine while it is operating or

running down.
Stay alert!

Give your work undivided attention. Use common sense.
Keep an ergonomic body position.

Maintain a balanced stance at all times.
Do not operate the machine when you are tired.

Do not operate the machine under the influence of drugs,
alcohol or any medication. Be aware that medication can
change your behaviour.

Keep children and visitors a safe distance from the work
area.

Never leave a running machine unattended.
Before you leave the workplace switch off the machine.

Do not operate the electric tool near inflammable liquids or
gases.
Observe the fire fighting and fire alert options, for example
the fire extinguisher operation and place.

Do not use the machine in a dump environment and do not
expose it to rain.

Insure that the workpiece does not roll when cutting round
pieces.
Use suitable table extensions and supporting aids for difficult
to handle workpieces.

Always adjust the blade guide close to the workpiece.
Remove cut and jammed workpieces only when motor is

turned off and the machine is at a complete standstill.
Work only with well sharpened tools.
Bearbeiten Sie nur ein Werkstück, das sicher auf dem Tisch

aufliegt.
Specifications regarding the maximum or minimum size of

the workpiece must be observed.
Do not stand on the machine.
Never operate with the guards not in place – serious risk of

injury!
Connection and repair work on the electrical installation may

be carried out by a qualified electrician only.
Have a damaged or worn cord replaced immediately.
Make all machine adjustments or maintenance with the

machine unplugged from the power source.
Remove defective saw blades immediately

3.3 Remaining hazards

When using the machine according to regulations some
remaining hazards may still exist

The moving saw blade in the work area can cause injury.
Broken saw blades can cause injuries.
Thrown cutting chips and noise can be health hazards.

Be sure to wear personal protection gear such as safety
goggles and ear protection.

The use of incorrect mains supply or a damaged power cord
can lead to injuries caused by electricity.

MBS-823DGVI / MBS-827DGVI

4. Machine dimensions, Transport, Installation and
Dismantling

4.1 Machine dimensions

MBS-823DGVI

MBS-827DGVI

4.2 Assembling the Saw and the Base

- Join panels A, B, and C by inserting tenon into mortise as
shown in circle diagram 1 and 2.

- Fasten bottom panel D into the joined panels A, B, and C
using setscrews that are provided

- Attach panel F to panel C with provided setscrews.

- Attach control box with two provided setscrews.

- Mount the saw unit on the base as shown in drawing 5.

- Fasten the saw unit to the base with provided set screws.

If the machine needs to be moved in its own packing, use
a forklift truck or sling it with straps as illustrated in
drawing above.

4.3 Minimum requirements for housing the machine

- Main voltage and frequency must comply with the
machine’s motor requirements.

- Environment temperature should fall within –10 ºC to
+50 ºC.

- Relative humidity cannot be over 90%.

4.4 Anchoring the machine

Position the machine on a firm cement floor, maintaining,
at the rear, a minimum distance of 800 mm from the wall;
anchor it to the ground as shown in the diagram, using
screws and expansion plugs or tie rods sunk In cement,
ensuring that it is sitting level.

MBS-823DGVI / MBS-827DGVI

4.5 Instructions for assembly of the loose parts and
accessories

Fit the components supplied:
Detail 1 Mount bar-stop rod
Detail 2 Mount and align the roll-supporting arm as per the

counter-vise table.

4.6 Deactivation of machine

- If the sawing machine is to be out of use for a long period, it
is advisable to proceed as follows:

1) Detach the plug from the electric supply panel

2) Loosen blade

3) Release the arch return spring

4) Empty the coolant tank

5) Carefully clean and grease the machine

6) If necessary, cover the machine.

4.7 Dismantling (due to deterioration and/or obsolescence)

General rules

If the machine is to be permanently demolished and/or
scrapped, divide the material to be disposed of according to
type and composition, as follows:

1) Cast iron or ferrous materials, composed of metal
alone, are secondary raw materials, so they may be taken to

an iron foundry for re-smelting after having removed the
contents (classified in point 3).

2) Electrical components, including the cable and electronic
material (magnetic cards, etc.), fall within the category of
material classified as being assimilated to urban waste
according to the laws of your local, state, or federal
government, so they may be set aside for collection by the
public waste disposal service;

3) Old mineral and synthetic and/or mixed oils, emulsified oils
and greases are considered hazardous or special refuse, so
they must be collected, transported and disposed of at a
special waste disposal service.

NOTE: The standards and legislation concerning refuse is in
a constant state of evolution, therefore is subject to changes.
The user must keep informed of the regulations at the time of
disposal as these may differ from those described above.

5 The machine´s functional parts

5.1 The saw arm

Machine parts consisting of drive members (gear motor or
variable speed motor, flywheels), tightening and guide (blade
tightening slide, blade guide blocks) of tool.

MBS-823DGVI

MBS-827DGVI

MBS-823DGVI / MBS-827DGVI

C1 Manual position

C2 Auto position

5.2 Controls

A. Hydraulic Flow control valve
B. Hydraulic regulation valve
C Trigger Switch
D Blade Tension gauge

C. Fork handle
S. Spring knob

MBS-823DGVI / MBS-827DGVI

MBS-823DGVI / MBS-827DGVI

A. Main connect switch
B. Manual/Auto selector
C. Indicator light
D. Auto start cutting button
E. Emergency push button
F. Blade Speed adjusting knob
G. Blade Speed display

5.3 Vise adjustment

- The device does not require any particular adjustment;
in case of excess play of the sliding guide, tighten slide
screw more.

To move the vise in either direction, the vise jaw must be
unlocked at two points.

- Release the track support by turning handle (1) counter­clockwise.

- Release the vise by moving the lever (2) to the left.

- The vise (5) may now be moved to right position (7) or
left position (6) by pushing it with one hand on the vise
and the other hand on the track handle (1).

- Once in position, move the lever (2) to the right to lock it
into position.

- Lock the track support (1) by turning handle clockwise.

Clamping the Work Piece

- Place work piece between the jaws.

- Use the hand wheel to approach the vise jaws to the work
piece, make the vise jaw to against the material. Lock the
work piece by push down the lever (4).
Push start cutting button (D). When the cutting cycle is
finished, release vise by pulling lever (4) up. Upon releasing
the lever (4), the vise jaw will open. This allows for rapid
loading of same size material.

5.4 Cutting angle adjustment

Cutting at angles

- Using the right side, angles can be cut up to 60 degrees.
This requires that vise jaw to be set on the left side (6).

- Using the left side, angles can be cut up to 45 degrees.
This requires the vise jaw to be set on the right side (7).

- Unlock lever (3) and rotate the saw frame arm until you
reach mechanical stop and check if the index corresponds to
45 degrees; if not, operate on the set screws to make
measures meet.

5.5 The base

- A structure supporting the SAW ARM (revolving arm for
gradual cutting and respective blocking system), the VISE,
the BAR STOP, the ROLLER for the support of the material.
The base houses the cooling liquid TANK and PUMP.

MBS-823 DGVI

MBS-827DGVI

MBS-823DGVI / MBS-827DGVI

The hydraulic cylinder is ideal for the cutting of thin or
stainless steel section bars that determines a constant
lowering and consequently a good efficiency of the blade
throughout the work phase.

By adjusting the flow control valve (A), this device can be
accommodated to the different situations and applications.
(B) level is on/off switch to control hydraulic flow.

5.7 The operation cycle

Before operating, all the main organs of the machine must be
set in optimum conditions.

5.6 Saw frame moving down flow control

C1 Manual position

MBS-823DGVI / MBS-827DGVI

C2 Auto position

Operation Procedure:
A. Trigger switch operation by manual

- Raise the saw arm.

- Close the hydraulic flow control valve on the cylinder (B)
(5.6) by turning the valve clockwise all the way to the end.

- Lift the spring knob (S) to release the pin from its slot.
This will free the fork handle (C). Move the handle to the
manual position (C1). Lift the spring knob (S) and secure
its pin into its slot.

- Use manual/auto selector (B) to select handle icon.

- Preset cutting speed by turning speed selector knob (F).

- Turn main connect switch (A) to the ON position. Check
that the indicator light (C) is on.

- Load work piece and clamp it properly.

- Fully open the hydraulic flow regulation valve (B) (5.6)
by turning the valve counter-clockwise all the way to the
end and also fully open the flow control knob (A) by turn it
counter-clockwise.

- If cutting pipe with thin walls, reduce the saw arm descent
rate by adjusting the flow control valve (A).

- Press the emergency push button (E) down to shut off all
functions. To release the emergency push button rotate the
mushroom shaped button (E) clock-wise. The button will
pop up and then the cutting cycle can be restarted.

- In general, start cuts by slightly turning hydraulic flow
control valve (A) counter-clockwise from 2 to 3 to control the
saw arm descent rate. If the arm descends too quickly, turn
the hydraulic flow regulation valve (B) clockwise all the way
back to stop its descent. A saw arm dropping too quickly
can cause the blade to stall on the work piece and the
machine will shut off. Push down on emergency push
buttons (E) on the panel and (K) MBS-823DG on the base to
immediately stop all machine functions.

B. Auto cutting operation

- Raise the saw arm.

- Close the hydraulic flow control valve (A) by turning the
valve clockwise all the way to the end.

- Lift the spring knob (S) to release the pin from its slot.
This will free the fork handle (C). Move the handle to the
auto position (C2). Lift the spring knob (S) and secure its
pin into its slot.

- Use manual/auto selector (B) to select auto.

- Select cutting speed by turning speed selector (F).

- Turn main connect switch (A) to the ON position.
Check that the indicator light (C) is on.

- Load work piece and clamp it properly.

- Press start button (D) to start machine. Check that the
blade is running in the correct direction.

- Slightly pull the saw arm down to get rid of air bubbles from
the hydraulic cylinder.

- Adjust hydraulic flow control valve (A) by slightly turning
the valve counter-clockwise to let saw arm descend and start
cutting.

- Press the emergency push button (E) down to shut off all
functions. To release the emergency shut off rotate
emergency push button (E) clock-wise. The button will pop
up and then the cutting cycle can be restarted.

- In general, start cuts by slightly turning hydraulic flow
control valve (A) counter-clockwise from 2 to 3 to control the
saw arm descent rate. If the arm descends too quickly, turn
hydraulic flow regulation valve (B)(5.6) clockwise all the way
back to stop its descent. A saw arm dropping too quickly
can cause the blade to stall on the work piece and the
machine will shut off. Push down on emergency push
button (E) to immediately stop all machine functions.

- Press trigger switch (C) to start operation.

- Reset blade speed.

MBS-823DGVI / MBS-827DGVI

Blade cutting direction

6. Advice on using your bandsaw

6.1 Recommendations and advice for using the
machine

The machine has been designed to cut metal building
materials, with different shapes and profiles, used in
workshops, turner's shops and general mechanical
structural work.

Only one operator is needed to use the machine, that
must stand as shown in the picture.

- Do not use blades of a different size from those stated in
the machine specifications.

- If the blade gets stuck in the cut, release the running button
immediately, switch off the machine, open the vise slowly,
remove the part and check that the blade or its teeth are not
broken. If they are broken, change the tool.

- Before carrying out any repairs on the machine, consult the
dealer.

7. Adjusting your machine

7.1 Blade tension assembly

The ideal tension of the blade is achieved rotating the hand
wheel until the needle reaches the proper blade tension on
the tension gauge (A).

The machine will not operate if the micro switch does not
actuate by contacting the tension device (C).

- Before starting each cutting operation ensure that the
part is firmly clamped in the vise and that the end is
suitably supported.

- These figures below show examples of suitable
clamping of different section bars, bearing in mind the
cutting capacities of the machine in order to achieve a
good efficiency and blade durability

If the tension is set properly, but the micro switch (B) does
not contact or trigger properly, make this adjustment.

If the tension is set properly, but the micro switch (B) does
not contact or trigger properly, make this adjustment.

If the tension is set properly, but the micro switch (B) does
not contact or trigger properly, make this adjustment.

- Loosen the setscrews (D).

- Push the micro switch (B) towards the tension device (C).
Make sure that the plunger is pressed properly.

MBS-823DGVI / MBS-827DGVI

- Tighten down the setscrews (D) to secure the micro
switch (B) in place.

7.2 Adjusting the blade guide

- Disconnect the machine from the power source.

- Use a Hex. Wrench to loosen Hex. Socket screw (A) on
the square lock plate.

- Hold the handle (B) and slide blade guide block as close
as possible to the material without interfering with the cut

- Tighten the Hex. Socket screw (A).

- Reconnect the machine to power source.

Blade guide blocks

The blade is guided by means of adjustable pads set in
place during inspection as per the thickness of the blade
with minimum play as shown in the figure.

In case the blade needs to be replaced, make sure to always
install 0.9mm thick blades for which the blade guide pads
have been adjusted. In the case of toothed blades with
different thickness adjustment should be carried out as
follows:

- Loosen nut (C), screw (B) and loosen dowel (D) widening
the passage between the pads.

- Loosen the nuts (H) and the dowels (I) and rotate the pins
(E - G) to widen the passage between the bearings (F).

- To mont the new blade: place the pad (A) on the blade,
loosening the dowel, allow a play of 0.04 mm for the sliding
of the toothed blade, lock the relative nut and screw (B),
Rotate the pins (E - G) until the bearings rest against the
blade as indicated in the figure and then secure the dowels
(I) and nut (H).

- Make sure that between the blade and the upper teeth of
the pad (L) this is at least 0.2 - 0.3 mm of play; if necessary,
loosen the screws that fasten the blocks and adjust
accordingly.

BEFORE PERFORMING THE FOLLOWING OPERATIONS,
THE ELECTRIC POWER SUPPLY AND THE POWER
CABLE MUST BE COMPLETELY DISCONNECTED.

7.Changing the blade

To change the blade:

- Lift the saw arm.

- Loosen the blade with the hand wheel, remove the mobile
blade-guard cover, open the flywheel guards and remove the
old blade from the flywheels and the blade guide blocks.

- Assemble the new blade by placing it first between the pads
and then on the race of the flywheels, paying particular
attention to the cutting direction of the teeth.

- Tension the blade and make sure it perfectly fits inside
the seat of the flywheels.

- Assemble the mobile blade-guide end, the flywheel
guard, and fasten it with the relative knobs. Check that
the safety micro switch is activated otherwise when
electric connection will be restored the machine will not
start.

7.4 Adjusting the blade to the blade wheels

1. Loosen the hex nut screws A, B, and C.

2. Use an Allen wrench on setscrew D to adjust the tilt of
the blade wheel.

-Turning the setscrew D clockwise will tilt blade wheel so
that the blade will ride closer to the flange.

-Turning the setscrew D counter-clockwise with tilt the
blade wheels that the blade will ride away from the
flange.

If the blade rides away too far then it will come off.
After the adjustment is finished, fasten the hex nut screws

in this order: A, B, and C.

A- A tilt in this direction will cause the blade to ride
towards the flange.

MBS-823DGVI / MBS-827DGVI

B- A tilt in this direction will cause the blade to ride away from
the flange.

D- Set screw

Checking the adjustment of the blade

E- Paper
F- Flywheel
G- Blade direction

Use a strip of scrap paper and slide it between the blade and
the blade wheel while it is running.

- If the paper is cut then the blade is riding too close to the
flange. Re-adjust.

- If you notice that the blade is riding away from the flange.
Then re-adjust

WARNING: Always assemble blades having dimensions
specified in this manual and for which the blade guide heads
have been set; otherwise, see chapter on "Description of the
operating cycle" in the section Starting-up.

8. Routine and special maintenance

THE MAINTENANCE JOBS ARE LISTED BELOW, DIVIDED
INTO DAILY, WEEKLY, MONTHLY AND SIX-MONTHLY
INTERVALS. IF THE FOLLOWING OPERATIONS ARE
NEGLECTED, THE RESULT WILL BE PREMATURE WEAR
OF THE MACHINE AND POOR PERFORMANCE.

8.1 Daily maintenance

- General cleaning of the machine to remove accumulated
shavings.

- Clean the lubricating coolant drain hole to avoid excess
fluid.

- Top off the level of lubricating coolant.

- Check blade for wear.

- Rise of saw frame to top position and partial slackening of
the blade to avoid useless yield stress.

- Check functionality of the shields and emergency stops.

MBS-823DGVI / MBS-827DGVI

8.2 Weekly maintenance

- Thorough cleaning of the machine to remove shavings,
especially from the lubricant fluid tank.

- Removal of pump from its housing, cleaning of the
suction filter and suction zone.

- Clean the filter of the pump suction head and the
suction area.

- Use compressed air to clean the blade guides (guide
bearings and drain hole of the lubricating cooling).

- Cleaning flywheel housings and blade sliding surfaces
on flywheels.

8.3 Monthly maintenance

- Check the tightening of the blade wheel screws.

- Check that the blade guide bearings on the heads are
perfect running condition.

- Check the tightening of the screws of the gear motor,
pump, and accident protection guarding.

8.4 Six-monthly maintenance

- Continuity test of the equipment potential protection
circuit.

8.5 Maintenance of other machine parts

The worm drive gearbox mounted on the machine is
maintenance-free guaranteed by its manufacture.

8.6 Öle für das schmierfähige Kühlmittel

Verwenden Sie das biologisch abbaubare
Kühlschmiermittel Art.: 9176. DER MINIMALE
PROZENTSATZ VON ÖL IN WASSER GELÖST
SOLLTE 8 - 10 % BETRAGEN.

8.7 Oils for lubricating coolant

Considering the vast range of products on the market, the
user can choose the one most suited to their own
requirements, using as reference the type SHELL LUTEM
OIL ECO. THE MINIMUM PERCENTAGE OF OIL
DILUTED IN WATER IS 8 - 10 %.

8.8 The gear box

The gearbox requires periodic changing of oil. The oil must
be changed by the first 6 months of a new machine and
every year thereafter.

To change the gear box oil

- Disconnect the machine from the power source.

- Raise the saw arm to vertical position

- Release the drain hole (O) to draw off gear oil by loosening
the hex socket screw (O).

- Replace the screw (O) after oil completely flows off.

- Place the saw arm back to horizontal position.

- Fill Gear box with approximately .3 liter of gear oil through
the hole of the vent screw (Q)

For reference, use SHELL type gear oil or Mobile gear oil
#90.

8.9 Special maintenance

Special maintenance must be conducted by skilled
personnel. We advise contacting your nearest dealer and/or
importer. Also the reset of protective and safety equipment
and devices (of the reducer), the motor, the motor pump, and
other electrical components requires special maintenance.

MBS-823DGVI / MBS-827DGVI

9. Technical characteristics

9.1 Table of cutting capacity and technical details
MBS-823DGVI

Cutting capacity

Electric motor-blade rotation 1.1kW
Flywheel diameter 295mm
Blade dimensions 27x0,9x2460mm
Blade speed cutting 20~85 m/min
Opening vice 260mm
Saw frame tilting 40°
Working table height 900mm
Weight 280 kg

MBS-827DGVI

Cutting capacity

10. Choosing the saw band

Choose a toothing that is appropriate to the workpiece being
processed. Ideally, at least 3 teeth should be in action at the
same time.

The toothing should not be smaller than necessary, as the
cutting speed is reduced if there are too many small teeth
working on the workpiece simultaneously, which causes the
saw band to wear more quickly, and makes the cuts crooked
and distorts them.

The following table shows the approximate toothing of the
saw bands for a specific material thickness. For further
information please contact your saw band dealer.

Electric motor-blade rotation 1.5kW
Flywheel diameter 380mm
Blade dimensions 27x0,9x3160mm
Blade speed cutting 20~85 m/min
Opening vice 355mm
Saw frame tilting 40°
Working table height 900mm
Weight 360 kg

9.2 Noise emission

Acoustic pressure level (EN 11202):
Idling Lpa 71,0 dB(A)
Operating Lpa 83,8 dB(A)

The specified values are emission levels and are not
necessarily to be seen as safe operating levels.

As workplace conditions vary, this information is intended
to allow the user to make a better estimation of the
hazards and risks involved only.

Comments

10/14 toothing provides good cutting results for thin-walled
pipes and profiles.

The choice of toothing (i.e. the number of teeth per inch)
should be such that at least 3 teeth are always in action at
the same time.

MBS-823DGVI / MBS-827DGVI

When cutting thick material, a coarse Tooth Pitch “T” is

needed to accommodate the big chips.

Cutting speed selection

The general rule is the harder the material being cut, the
slower the blade speed.

20 m/min

for stainless steel, alloy steel and bearing bronzes.

30-50 m/min

for mild steel, hard brass or bronze.

65 m/min

for soft brass, aluminium or other light materials.

Saw band lubricant

The lifetime of the saw band can be extended
significantly by lubricating it with stick wax item no.

100103.

NOTE
Some materials, such as stainless steel or aluminium,
require specific oils.

Rounding of teeth
A carefully broken in blade lasts much longer and gives
better performance.

Perfect:
Loose curled chips

If the chips are thin or powdered increase the feed pressure.
If the chips are burned reduce the cutting speed and

decrease the feed pressure.

10.1 Blade structure

Bi-metal blades are the most commonly used. They consist
of a silicon-steel blade backing by a laser welded high speed
steel (HHS) cutting edge. The type of stocks are classified in
M2, M42, M51 and differ from each other because of their
major hardness due to the increasing percentage of Cobalt
(Cc) and molybdenum (Mo) contained in the metal alloy.

10.2 Blade type

They differ essentially in their constructive characteristics

- Shape and cutting angle of tooth,- Pitch

REGULAR TOOTH: Oº rake and constant pitch.

Most common form for transversal or inclined cutting of solid
small and average cross-sections or pipes, in laminated mild
steel and gray iron or general metal.

POSITIVE RAKE TOOTH: 9º - 10º positive rake and constant
pitch.

Particular use for crosswise or inclined cuts in solid sections
or large pipes, but above all harder materials (highly alloyed
and stainless steels, special bronze and forge pig iron).

COMBO TOOTH: pitch varies between teeth and
consequently varying teeth size and varying gullet depths.
Pitch varies between teeth, which ensures a smoother,
quieter cut and longer blade life owing to the lack of vibration.

To break in your new blade, run it at only 30% of normal
pressure for ten minutes.
Then gradually increase to normal pressure.

Feed pressure selection:

A good indication of proper feed pressure is the shape of
the cutting chips.

Another advantage offered in the use of this type of blade in
the fact that with an only blade it is possible to cut a wide
range of different materials in size and type.

MBS-823DGVI / MBS-827DGVI

COMBO TOOTH: 9º - 10º positive rake.

This type of blade is the most suitable for the cutting of
section bars and large and thick pipes as well as for the
cutting of solid bars at maximum machine capacity.
Available pitches: 3-4/4-6.

SETS

Saw teeth bent out of the plane of the saw body, resulting
in a wide cut in the workpiece.

REGULAR OR RAKER SET: Cutting teeth right and left,
alternated by a straight tooth.

Of general use for materials with dimensions superior to 5
mm. Used for the cutting of steel, castings and hard
nonferrous materials.

WAVY SET: Set in smooth waves.

This set is associated with very fine teeth and it is mainly
used for the cutting of pipes and thin section bars (from 1
to 3 mm).

ALTERNATE SET (IN GROUPS): Groups of cutting teeth
right and left, alternated by a straight tooth.

This set is associated with very fine teeth and it is used
for extremely thin materials (less than 1mm).

ALTERNATE SET (INDIVIDUAL TEETH): Cutting teeth
right and left.

This set is used for the cutting of nonferrous soft
materials, plastics and wood.

TYPES OF STEEL

CHARACTERISTICS

USE

I

UNI D DIN

F

AF NOR

GB
SB

USA

AISI-

SAE

Hardne

ss

BRINEL

L HB

Hardness

ROCKWE

LL HB

R=N/mm

2

Constructi
on Steel

Fe360
Fe430
Fe510

St37
St44
St52

E24
E28
E36

---­43
50

----

----

----

116
148
180

67
80
88

360÷480
430÷560
510÷660

Carbon
Steel

C20
C40
C50
C60

CK20
CK40
CK50
CK60

XC20

XC42H1

----

XC55

060 A

20

060 A

40

----

060 A

62

1020
1040
1050
1060

198
198
202
202

93
93
94
94

540÷690
700÷840
760÷900
830÷980

Spring
Steel

50CrV4

60SiCr8

50CrV4

60SiCr7

50CV40

----

735 A

50

----

6150
9262

207
224

95
98

1140÷13

30

1220÷14

00

Alloyed

steels for

hardening

and

tempering

and for

nitriding

35CrMo4
39NiCrMo4
41CrAlMo7

34CrMo4
36CrNiMo4
41CrAlMo7

35CD4
39NCD4
40CADG

12

708 A

37

----

905 M

39

4135
9840

----

220
228
232

98
99

100

780÷930
880÷108

0

930÷113

0

Alloyed

caseharden

ing steels

18NiCrMo7
20NiCrMo2

----

21NiCrMo2

20NCD7
20NCD2

En 325

805 H

20

4320
4315

232
224

100

98

760÷103

0

690÷980

Alloyed
steel for
bearings

100Cr6

100Cr6

100C6

534 A

99

52100

207

95

690÷980

Tool steel

52NiCrMoK

U

C100KU

X210Cr13K

U

58CrMo171

3

56NiCrMoV7C1

00K

C100W1

X210Cr12

----

----

----

Z200C12

Y60SC7

----

BS 1

BD2-

BD3

----

----

S-1

D6-D3

S5

244
212
252
244

102

96
103
102

800÷103

0
710÷980
820÷106

0
800÷103

0

Stainless
steel

X12Cr13
X5CrNi1810
X8CrNi1910

X8CrNiMo1

713

4001
4301

----

4401

----

Z5CN18.

09

----

Z6CDN1

7.12

----

304 C

12

----

316 S

16

410
304

----

316

202
202
202
202

94
94
94
94

670÷885
590÷665
540÷685
490÷685

Copper

alloys ,

Special

brass,

Bronze

Aluminium copper alloy G-CuAl11Fe4Ni4 UNI 5275
Special manganese/silicon-brass G-CuZn36Si1Pb1 UNI5038
Manganese bronze SAE43-SAE430
Phosphor bronze G-CuSn12 UNI 7013/2a

220
140
120
100

98
77
69

56.5

620÷685
375÷440
320÷410
265÷314

Cast iron

Gray pig iron G25
Spheroidal graphite cast iron GS600
Malleable cast iron W40-05

212
232
222

96

100

98

245
600
420

10.3 Workpiece materials and characteristics

MBS-823DGVI / MBS-827DGVI

MBS-823DGVI / MBS-827DGVI

11. Environmental protection

Protect the environment.
Your appliance contains valuable materials which can be recovered or recycled. Please leave it at a specialized institution.

12. Available accessories

Refer to the JET-Pricelist for various saw blades.

MBS-823DGVI / MBS-827DGVI

FAULT

PROBABLE CAUSE

REMEDY

Tooth Breakage

Too fast advance

Decrease advance, exerting less cutting
pressure. Adjust the braking device.

Wrong cutting speed

Change speed and/or type of blade.
See chapter on "Material classification
and blade selection", in the section

Blade selection table according to
cutting and feed speed.

Wrong tooth pitch

Choose a suitable blade. See Chapter
"Material classification and blade
selection".

Chips sticking onto teeth and in
the gullets or material that gums

Check for clogging of coolant drain
holes on the blade-guide blocks and
that flow is plentiful in order to facilitate
the removal of chips from the blade.

Defects on the material or material
too hard

Material surfaces can be oxidized or
covered with impurities making them,
at the beginning of the cut, harder that
the blade itself, or have hardened
areas or inclusions inside the section
due to productive agents used such as
casting sand, welding wastes, etc.
Avoid cutting these materials or in a
situation a cut has to be made use
extreme care, cleaning and remove
any such impurities as quickly as
possible.

Ineffective gripping of the part in
the vise

Check the gripping of the part.

The blade gets stuck in the material

Reduce feed and exert less cutting
pressure.

Starting cut on sharp or irregular
section bars

Pay more attention when you start
cutting.

Poor quality blade

Use a superior quality blade

Previously broken tooth left in the
cut

Accurately remove all the parts left in.

Cutting resumed on a groove
made previously

Make the cut elsewhere, turning the

part.

Vibrations

Check gripping of the part.

13. Troubleshooting

This chapter lists the probable faults and malfunctions that could occur while the machine is being used and suggests possible
remedies for solving them.

13.1 Blade and cut diagnosis

MBS-823DGVI / MBS-827DGVI

FAULT

PROBABLE CAUSE

REMEDY

Tooth Breakage

Wrong tooth pitch or shape

Replace blade with a more suitable
one. See "Material classification and
blade selection" in the Blade Types
section. Adjust blade guide pads.

Insufficient lubricating, refrigerant,
or wrong emulsion

Check level of liquid in the tank.
Increase the flow of lubricating
refrigerant, checking that the hole and
the liquid outlet pipe are not blocked.
Check the emulsion percentage.

Teeth positioned in the
direction opposite the cutting
direction

Turn teeth to correct direction

FAULT

PROBABLE CAUSE

REMEDY

Premature blade wear

Faulty running-in of blade

See "Material classification and blade
selection" in the Blade running-in
section.

Teeth positioned in the
direction opposite the cutting
direction

Turn teeth in correct direction.
Poor quality blade

Use a superior quality blade.

Too fast advance

Decrease advance, exerting less cutting
pressure. Adjust the braking device.

Wrong cutting speed

Change speed and/or type of blade.
See chapter on "Material classification
and blade selection,” in the section

Blade selection table according to
cutting and feed speed.

Defects on the material or material
too hard

Material surfaces can be oxidized or
covered with impurities making them,
at the beginning of the cut, harder that
the blade itself, or have hardened
areas or inclusions inside the section
due to productive agents used such as
casting sand, welding wastes, etc.
Avoid cutting these materials or
perform cutting with extreme care,
cleaning and remove such impurities
as quickly as possible.

Insufficient lubricating refrigerant
or wrong emulsion

Check level of liquid in the tank.
Increase the flow of lubricating coolant,
checking that the coolant nozzle and
pipe are not blocked. Check the
emulsion percentage.

MBS-823DGVI / MBS-827DGVI

FAULT

PROBABLE CAUSE

REMEDY

Sawblade breakage

Faulty welding of blade

The welding of the blade is of utmost
importance. The meeting surfaces
must perfectly match and once they
are welded they must have no
inclusions or bubbles; the welded part
must be perfectly smooth and even.
They must be evenly thick and have
no bulges that can cause dents or
instant breakage when sliding
between the blade guide pads.

Too fast advance

Decrease advance, exerting less
cutting pressure. Adjust the braking
device.

Wrong cutting speed

Change speed and/or type of blade.

Wrong tooth pitch

See chapter on "Material classification
and blade selection", in the section

Blade

selection table according to cutting and
feed speed.

Ineffective gripping of the part in
the vice

Choose a suitable blade. See Chapter
"Material classification and blade
selection.”

Blade touching material at
beginning of cut

Check the gripping of the part.

Remedy

At the beginning of the cutting process,
never lower the saw bow before starting
the blade motor

Blade guide pads not regulated
or dirty because of lack of
maintenance

Check distance between pads (see
"Machine adjustments" in the Blade
Guide Blocks section): extremely
accurate guiding may cause cracks
and breakage of the tooth. Use
extreme care when cleaning.

Blade guide block too far from
material to be cut

Approach head as near as possible to
material to be cut so that only the blade
section employed in the cut is free, this
will prevent deflections that would
excessively stress the blade.

Improper position of blade on
flywheels

The back of blade rubs against the
support due to deformed or poorly
welded bands (tapered), causing
cracks and swelling of the back
contour.

Insufficient lubricating coolant or
wrong emulsion

Check level of liquid in the tank.
Increase the flow of lubricating
refrigerant, checking that the hole and
the liquid outlet pipe are not blocked.
Check the emulsion percentage.

MBS-823DGVI / MBS-827DGVI

FAULT

PROBABLE CAUSE

REMEDY

Steaked or etched blades

Damaged or chipped blade guide
pads

Replace them.

Tight or slackened blade guide
bearings.

Adjust them (see Chapter "Machine
adjustments" in Blade guide section).

Cuts off the straight

Blade not parallel as to the counter
service

Check fastenings of the blade guide
blocks as to the counter-vice so that
they are not too loose and adjust
blocks vertically; bring into line the
position of the degrees and if
necessary adjust the stop screws of
the degree cuts.

Blade not perpendicular due to the
excessive play between the guide
pads and maladjustment of the
blocks

Check and vertically re-adjust the blade
guide blocks; reset proper side guide
play (see Chapter "Machine
adjustments" In Blade guide section).

Too fast advance

Decrease advance, exerting less
cutting pressure. Adjust the braking
device.

Worn out blade

Approach it as near as possible to
material to be cut so that only the blade
section employed in the cut is free, this
will prevent deflections that would
excessively stress the blade.

Wrong tooth pitch

Replace it. Blade with major density of
teeth is being used, try using one with
less teeth (see Chapter "Material
classification and blade selection" in
the Blade Types section).

Brooken teeth

Irregular work of the blade due to the
lack of teeth can cause deflection in the
cut; check blade and if necessary
replace it.

Insufficient lubricating refrigerant or
wrong emulsion

Check level of liquid in the tank.
Increase the flow of lubricating coolant,
checking that the hole and the liquid
outlet pipe are not blocked. Check the
emulsion percentage.

MBS-823DGVI / MBS-827DGVI

FAULT

PROBABLE CAUSE

REMEDY

Faulty cut

Worn out flywheels
Flywheel housing full of chips

The support and guide flange of the band
are so worn out that they cannot ensure
the alignment of the blade, causing faulty
cutting; blade rolling and drawing tracks
can have become tapered. Replace them.
Clean with compressed air.

Streaked cutting surface

Too fast advance

Decrease advance, exerting less
cutting pressure. Adjust the braking
device.

Poor quality blade

Use a superior quality blade.

Worn out blade or with chipped
and/or broken teeth

Replace it.

Wrong tooth pitch

Blade used probably has too large teeth,
use one with more teeth (see "Material
classification and blade selection" in
the Blade Types section).

Blade guide block too far from
material to be cut

Approach it as near as possible to
material to be cut so that only the blade
section employed in the cut is free, this
will prevent deflections that would
excessively stress the blade.

Insufficient lubricating coolant or
wrong emulsion

Check level of liquid in the tank. Increase
the flow of lubricating coolant, checking
that the hole and the liquid outlet pipe are
not blocked. Check the emulsion
percentage.

Noise on guide blocks

Chipped bearings
Worn out or damaged pads

Dirt and/or chips between blade and
guide bearings. Replace them.

Replace them