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 JBG-150/200 bench grinder to promote safety during installation, operation
and maintenance procedures. Please read and understand the informati on contained in these oper ating instructions and the
accompanying documents. To obtain maximum life and effi ciency from your machine, and to use the machine s afely, read
this manual thoroughly and follow instructions carefully.
…Table of Contents
1. Declaration of conformity
2. JET Warranty
3. Safety
Authorized use
General safety notes
Remaining hazards
4. Machine specifications
Technical data
Noise emission
Contents of delivery
5. Transport and start up
Transport and installation
Assembly
Mains connection
Starting operation
6. Machine operation
7. Setup and adjustments
Changing the abrasive wheel
Adjusting the spark guard
Adjusting the tool rest
8. Maintenance and inspection
9. Troubleshooting
10. Available accessories
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. JET Group Warranty
The JET Group makes every effort to
assure that its products meet high
quality and durability standards and
warrants to the original retail
consumer/purchaser of our products
that each product be free from
defects in materials and workmanship
as follows:
2 YEARS ON ALL MECHANICAL
PARTS
1 YEAR ON ALL ELECTRICAL
PARTS
This Warranty does not apply to
defects due to directly or indirectly
misuse, abuse, negligence or
accidents, normal wear-and-tear,
repair or alterations outside our
facilities, or to a lack of maintenance.
The Jet group limits all implied
warranties to the period specified
above, from the date the product was
purchased at retail.
To take advantage of this warranty,
the product or part must be returned
for examination, postage prepaid, to
an authorized repair station
designated by our office.
Proof of purchase date and an
explanation of the complaint must
accompany the merchandise.
If our inspection discloses a defect,
we will either repair or replace the
product, or refund the purchase price
if we cannot readily and quickly
provide a repair or replacement, if
you are willing to accept a refund.
We will return repaired product or
replacement at JET’S expense, but if
it is determined there is no defect, or
that the defect resulted from causes
not within the scope of JET’S
warranty, then the user must bear the
cost of storing and returning the
product.
The JET Group reserves the right to
make alterations to parts, fittings, and
accessory equipment which they may
deem necessary for any reason
whatsoever.
3. Safety
3.1 Authorized use
This machine is designed for grinding
metal materials only without use of
water.
Machining of other materials is not
permitted and may be carried out in
specific cases only after consulting
with the manufacturer.
Never cut magnesiumhigh danger to fire!
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.
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.
Use safety goggles at all times.
Use ear protection at all times.
Wear a face and dust mask when
working in a dusty environment.
Do NOT stop the abrasive wheel by
forcing the machine or by using
sideways pressure.
The material to be cut must be held
firmly so it can not move during
the cutting operation.
Never cut pieces that are too small.
Support long work pieces with helping
roller stands.
Never place your hand near the
cutting area while machine is in
operation.
Do not perform any operation
freehand; always have the
workpiece supported by the tool
rest.
Allow the abrasive wheel to come to a
complete standstill before using the
unit again or making adjustments.
Do not touch the machined
workpiece until it cools or you may
be burned!
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 bolted
on a firm workbench or stand.
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.
Stay alert!
Give your work undivided attention.
Use common sense.
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.
Do not allow anyone to stand behind
the unit or close to the workpiece
where debris can be thrown.
Allow the abrasive wheel to reach full
speed before cutting.
Flying sparks will occur when cutting.
They can cause injury and ignite
flammable materials.
Never reach into the machine while it
is operating or running down.
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.
Normal brushfire might ignite.
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.
Do not force the power tool. It will do
a better and safer job and give you
much better service if it is used at the
rate for which it was designed.
Do not remove chips and workpiece
parts until the machine is at a
complete standstill.
Make sure the tool operates properly.
Periodically check screws and bolts
for tightness.
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
Always unwind any extension cords
fully.
Damaged extension cords replace
immediately.
Do not use the power tool if the
ON/OFF switch does not turn the
power tool ON and OFF.
Make all machine
adjustments or
maintenance with the
machine unplugged from
the power source.
Use only abrasive wheels rated at
3000 RPM or higher.
Remove defective abrasive wheels
immediately.
3.3 Remaining hazards
When using the machine according to
regulations some remaining hazards
may still exist
The moving abrasive wheels in the
work area can cause injury.
Broken abrasive wheels can cause
injuries.
Thrown cutting chips, dust and noise
can be health hazards.
Be sure to wear personal protection
gear such as safety goggles, dust
mask and ear protection.
Some dust and gases created by
power cutting can be heath hazards.
To reduce your risk of exposure, work
in a well ventilated area.
The use of incorrect mains supply or
a damaged power cord can lead to
injuries caused by electricity.
Avoid body contact with earthed or
grounded surfaces (e.g. pipes,
radiators, ranges and refrigerators).
4. Machine specifications
4.1 Technical data
JBG-150:
Abrasive wheel Ø150x 20mm
Shaft diameter Ø12,7mm (1/2”)
No load speed 2950 rpm
Wheel grits 36 / 60
Overall L x W x H 430 x 200 x 265mm
Weight 10 kg
Mains 230V ~1L/N/PE 50Hz
Motor power 260W S1
Reference current 1,7 A
Machine lamp max. 40W
Extension cord (H07RN-F) 3x1,5mm²
Installation fuse protection 10A
Isolation class I
JBG-200:
Abrasive wheel Ø200x 25mm
Shaft diameter Ø15,9mm (5/8”)
No load speed 2950 rpm
Wheel grits 36 / 60
Overall L x W x H 440 x 230 x 290mm
Weight 17 kg
Mains 230V ~1L/N/PE 50Hz
Motor power 375W S1
Reference current 2,5 A
Machine lamp max. 40W
Extension cord (H07RN-F) 3x1,5mm²
Installation fuse protection 10A
Isolation class I
4.2 Noise emission
Determined according to EN
1807:1999 (Inspection tolerance 4 dB)
Acoustic power level (acc. EN 3746):
Idling 78,2 dB (A)
Acoustic pressure level (EN 11202):
Idling 70,4 dB (A)
The specified values are emission
levels and are not necessarily to be
seen as safe operating levels.
This information is intended to allow
the user to make a better estimation
of the hazards and risks involved.
4.3 Content of delivery
Bench grinder
Machine light
Abrasive wheels grit 36 and 60
2 Tool rests
2 Spark guards
2 Eye shields
Operating manual
Spare parts list
5. Transport and start up
5.1 Transport and installation
The machine is designed to operate
in closed rooms and must be placed
stable on firm and levelled surface.
The machine must be bolted down.
For packing reasons the machine is
not completely assembled.
5.2 Assembly
If you notice any transport damage
while unpacking, notify your supplier
immediately. Do not operate the
machine!
Dispose of the packing in an
environmentally friendly manner.
Clean all rust protected surfaces with
a mild solvent.
Mount the tool rests:
There is a left and a right tool rest,
ensure that you install them correctly.
Use the bolts (A, Fig 2) and washers
(B) and mount the tool rest (C) to the
wheel housing (D).
Fig 1
Adjust the tool rest to within 2mm of
the grinding wheel.
As the wheel wears down, the tool
rest must be re-adjusted.
Assembly of the eye shields:
Thread two screws (E, Fig 2) through
the mounting plate (F), eye shield
(G), mounting bracket (H) and
washers (I), and fasten with nuts (J).
Fig 2
Mounting the spark guards and
eye shields:
Use a bolt (K, Fig 3) and washer to
mount the eye shield and spark guard
(M).
Fig 3
Adjust the spark guard to within 2mm
of the grinding wheel.
As the wheel wears down, the spark
guard must be re-adjusted.
Mount the bench grinder:
To prevent the grinder from moving
during operation, it must be securely
mounted to a work bench or stand.
5.3 Mains connection
Mains connection and any extension
cords used must comply with
applicable regulations.
The mains voltage must comply with
the information on the machine
licence plate.
The mains connection must have a
10A surge-proof fuse.
Only use power cords marked
H07RN-F
Connections and repairs to the
electrical equipment may only be
carried out by qualified electricians.
5.4 Starting operation
You can start the machine with the
green ON-button.
The red OFF-button on the main
switch stops the machine.
The machine lamp On/Off-switch is
located on top of the lamp.
Use only a max. 40W, 230V light
bulb.
6. Machine operation
The bench grinder is designed for
grinding metal materials only without
use of water.
The Medium Grain Abrasive Wheel is
suitable for rough grinding where a
considerable amount of metal must
be removed.
The Fine Grain Abrasive Wheel is
suitable for sharpening tools and
grinding to close size and smooth
finish.
Hold and guide the workpiece safely
during machining.
Do not perform any operation
freehand; always have the workpiece
supported by the tool rest.
Apply a moderate pressure on the
workpiece and keep it moving for
smooth grinding.
Pressing too hard overheats the
motor and prematurely wears down
the grinding wheels.
Note the original bevel angle on the
item to be sharpened and try to
maintain the same shape.
The grinding wheel should rotate into
the object being sharpened.
Keep a tray filled with water and dip
your workpiece regularly to prevent
overheating.
Overheating can weaken metals.
When the wheel becomes loaded of
debris, use an approved grinding
wheel dresser and dress the wheel.
Warning:
The condition of the abrasive wheels
should be checked before each
machining process.
Work only with flawless abrasive
wheels.
Do not allow anyone to stand behind
the unit or close to the workpiece
where debris can be thrown.
Flying sparks will occur when cutting.
They can cause injury and ignite
flammable materials.
Use safety goggles at all times.
Use ear protection at all times.
Wear a face and dust mask when
working in a dusty environment.
Ensure that the wheel guards are in
the correct position before you start
machining.
Keep the tool rest and spark guard to
within 2mm of the grinding wheel.
Before starting the grinder, turn the
wheels by hand making sure they
turn freely.
Allow the abrasive wheels to reach
full speed before machining.
Do not use the side of the grinding
wheel; this puts dangerous stress on
the wheel.
Do not stop the wheel by side
pressure.
Do not touch the machined workpiece
until it cools or you may be burned!
Never place your hand near the
cutting area while machine is in
operation.
Never machine pieces that are too
small to hold safely.
Support long work pieces with helping
roller stands.
7. Setup and adjustments
7.1 Changing the abrasive wheel
The abrasive wheel may
only be changed when
the mains plug is pulled!
The abrasive wheel has to meet the
technical specification.
Use only abrasive wheels rated at
3000 RPM or higher.
Check abrasive wheel for flaws
(cracks) before installation.
Make the ring test.
Ring test:
An internal defect may not be
apparent by visual inspection alone.
The ring test may uncover an internal
crack or void.
Loop a piece of string through the
grinding wheel hole and suspend the
wheel.
Tap the wheel with a piece of scrap
wood.
A good wheel will "ring"; a defective
wheel will "thud".
Do not use a wheel that does not
“ring”.
To change a wheel:
Disconnect grinder from the power
source.
Move the tool rest (C, Fig 4) and the
spark guard away from the wheel.
Fig 4
Remove the wheel cover.
Remove the nut (P), clamping flange
(O) and abrasive wheel (Q).
Note:
Turn the nut on the right-hand wheel
counter-clockwise to loosen.
Turn the nut on the left-hand wheel
clockwise to loosen (left hand thread).
Clean flanges.
To install the new abrasive wheel
reverse the process.
Do not over tighten the nut; this may
cause the wheel to crack.
Replace the wheel cover.
Adjust the spark guards and tool rests
to a 2mm clearance from the wheel.
Plug in.
Before starting the grinder, turn the
wheels by hand making sure they
turn freely.
Run the unit and check to make sure
the abrasive wheel is in good
condition.
When testing a new abrasive wheel,
run the unit for 3 minutes.
Note:
Always stand on one side when
turning on the unit.
7.2 Adjusting the spark guard
As the wheel wears down, the spark
guard must be re-adjusted to
maintain a maximum 2mm clearance.
Loosen screw (K, Fig 5) to adjust.
Fig 5
7.3 Adjusting the tool rest
As the wheel wears down, the tool
rest must be re-adjusted to maintain a
maximum 2mm clearance.
Loosen screws (A) to adjust.
8. Maintenance and inspection
Make all machine
adjustments or
maintenance with the
machine unplugged from
the power source.
Maintenance, cleaning and repair
work may only be carried out after
the machine is protected against
accidental starting by pulling the
mains plug.
Repair and maintenance work on the
electrical system may only be carried
out by a qualified electrician.
Clean the machine regularly.
All protective and safety devices must
be re-attached immediately after
completed cleaning, repair and
maintenance work.
Defective safety devices must be
replaced immediately.
Cleaning:
Regularly clean the machine housing
with a soft cloth preferably after each
use.
If the dirt does not come off use a soft
cloth moistened with soapy water.
Never use solvents such as petrol,
alcohol, ammoniac water, etc. These
solvents may damage the plastic
parts.
9. Trouble shooting
Motor doesn’t start
*No electricitycheck mains and fuse.
*Defective switch, motor or cordconsult an electrician.
Machine vibrates excessively
*Stand on uneven surface-
adjust base for even support.
*abrasive wheel damaged-
replace abrasive wheel immediately
Grinding surfaces is bad
*Worn abrasive wheel
*workpiece not suitable for machining
*Feed pressure too high-
Do not force the machine.
10. Available accessories
Refer to the JET-Pricelist
for various saw blades.
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