Jet 3520B User manual

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 3520B wood lathe 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. 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
Dust collection
Starting operation
6. Machine operation
Correct operating position
Tool selection
Speed selection
Turning between centres
Bowl turning
Sanding and Finishing
7. Setup and adjustments
Changing spindle speeds
Headstock spindle lock
Headstock spindle index
Installing work holding
Adjusting tool rest
Adjusting tailstock
8. Maintenance and inspection
Adjusting bed clamping
Changing belt and bearings
9. Trouble shooting
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 YEAR LIMITED WARRANTY ON
ALL PRODUCTS UNLESS
SPECIFIED OTHERWISE.
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 wood lathe is designed for turning
wood only. Machining of other
materials is not permitted and may be
carried out in specific cases only after
consulting with the manufacturer.
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 woodworking 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
Woodworking 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 cable.
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.
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 table
surface.
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.
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.
Keep children and visitors a safe
distance from the work area.
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 or direct sunlight.
Wood dust is explosive and can also
represent a risk to health.
Dust form some tropical woods in
particular, and from hardwoods like
beach and oak, is classified as a
carcinogenic substance.
Always use a suitable dust collection
device
Before machining, remove any nails
and other foreign bodies from the
workpiece.
Make sure to guide and hold the chisel
with both hands safe and tight during
machining.
Work only with well sharpened tools.
Machine only stock which is chucked
securely on the machine, always check
before switching the machine on.
Provide workpieces with centre holes
before clamping between centres.
Work large and unbalanced
workpieces at low spindle speed only.
When sanding, remove the tool rest
from the machine.
Workpieces with cracks may not be
used.
Remove the chuck key or dowel pins
before turning the machine on.
Always close the belt cover.
Specifications regarding the maximum
or minimum size of the workpiece must
be observed.
Test each set-up by revolving the work
by hand to insure it clears the tool rest
and bed. Check setup at the lowest
speed before you increase to the
operating speed.
Do not remove chips and workpiece
parts until the machine is at a
standstill.
Never stop work pieces with the hand
during run out.
Do not attempt to engage the spindle
lock pin until the spindle has stopped.
Never take measurements on a
rotating workpiece.
Do not stand on the machine.
Do not obstrukt the air flow on heat
sinks of AC-drive (allow natural
cooling).
Connection and repair work on the
electrical installation may be carried
out by a qualified electrician only.
(Warning: Wait five minutes for DC-bus
capacitors discharge before accessing
the AC drive unit.)
Have a damaged or worn power cord
replaced immediately.
Make all machine adjustments or
maintenance with the machine
unplugged from the power source.
3.3 Remaining hazards
When using the machine according to
regulations some remaining hazards
may still exist.
The rotating workpiece can cause
injury.
Workpieces that are inhomogeneous
or weak can explode when being
processed due to centrifugal force.
Only process selected woods without
defects.
Unbalanced workpieces can be
hazardous.
Injuries can occur when feeding
tooling, if tool supports are not
correctly adjusted or if turning tools are
blunt.
Risk of kickback. The tooling is caught
by the rotating workpiece and thrown
back to the operator.
Thrown workpieces and workpiece
parts can lead to injury.
Dust and noise can be health hazards.
Be sure to wear personal protection
gear such as safety goggles and dust
mask. Use a suitable dust collection
system.
The use of incorrect mains supply or a
damaged power cord can lead to
injuries caused by electricity.

4. Machine specifications
4.1 Technical data
Swing over bed 508mm
Centre distance 800mm
Number of mechanical speeds 2
Spindle speed range 1 0-1200 rpm
Spindle speed range 2 0-3200 rpm
Spindle nose M33x3,5 DIN 800
Headstock spindle taper MT 2
Spindle index lock 24x15°, 36x10°
Spindle hole diameter 15,8mm
Tailstock spindle taper MT 2
Tailstock hole diameter 9,5mm
Tailstock ram travel 115mm
Centre above floor 1120mm
Overall (LxWxH) 1370x690x1470mm
Footprint (LxW) 1270x610mm
Net weight 326 kg
Mains 230V ~1/N/PE 50Hz
Output power 1,5 kW (2 HP) S1
Reference current 10 A
Extension cord (H07RN-F): 3x1,5mm²
Installation fuse protection 16A
4.2 Noise emission
Acoustic pressure level (EN 11202):
Idling 72,5 dB(A)
In operation 78,4 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.
4.3 Content of delivery
Casting legs with levelling pads
350 mm tool rest
75 mm face plate
Spur centre and tooling knockout bar
Live centre
Guard
Tool caddy
Comparator centers
Remote ON/OFF switch
Operating tools
Assembly kit
Operating manual
Spare parts list.
Fig 1
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 ground.
The machine can be bolted down if
required.
For packing reasons the machine is
not completely assembled
5.2 Assembly
If you notice 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.
Attach the leg stand:
At this point the headstock, tailstock
and tool rest should be removed.
The machine bed is heavy! With the
help of a second person, carefully lift
bed up onto a workbench.
Attach the leg stand with 8 hex socket
cap screws and 8 flat washers (A, Fig
2).
Fig 2
Thread adjustable feet (D) into stand
leg (B).
Adjust the feet so that the lathe rests
evenly on the floor, and tighten the
nuts (C).
Reinstall headstock, tailstock and tool
rest.
Tool caddy assembly:
Mount the tool caddy with two screws
and lock washers to the left leg (Fig 3)
Fig 3
The tailstock body can also be used to
store tools (Fig 4).
Fig 4
Stand shelf:
You can make an extra shelf that rests
between the legs if you wish (Fig 5-7).

Fig 5
Fig 6
Fig 7
Guard assembly:
Attach guard to the bracket by
inserting the rod and lifting up on the
plunger (A, Fig 8).
Fig 8
There are two detents that will hold the
guard in place.
One is for turning and the other is for
when you need the guard up and out
of the way.
Tighten the bushings (B) against the
bracket with two set screws (C).
Fig 9
Optical comparator assembly:
Mount the comparator rear bracket (A,
Fig 10) to the back of the tailstock with
two socket head cap screws, lock
washers and washers (B).
The bracket has a slot so it can be
aligned with the bracket on the
headstock.
The comparator allows to hold a
sample workpiece for optical reference
and comparative measurement taking.
( see Fig 11-12).
Fig 10
Fig 11
Fig 12
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
16 A 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 Dust collection
Use a suitable dust collection and
filtration system to avoid a high dust
concentrations in the air.
5.5 Starting operation
You can start the machine by pulling
the red ON/OFF button (A, Fig 13).
Fig 13
The machine will stop when you push
the red ON/OFF button (A, Fig 13) or
the remote control ON/OFF button (Fig
14).
Fig 14
Turn the knob (C) to the desired RPM.
There are 2 speed ranges offering
“speed” (0-3200 rpm) and
“torque” (0-1200 rpm).

The RPM Readout shows the spindle
speed
Use the toggle switch (B) to reverse
the spindle direction.
The headstock lock handle locks the
headstock in position. Unlock handle to
position the head along the lathe bed.
6. Machine operation
6.1 Correct operating position
Always support the tool on the tool rest
and guide with the palm of your hand
keeping your fingers closed.
(see Fig. 15 )
Fig 15
6.2 Tool selection
Successful wood turning does not
result from high speeds, but rather,
from the correct use of turning tools.
A perfect and sharp wood turner tool is
a precondition for professional wood-
turning.
Major tools:
Fig 16
Gouge (A, Fig 16), used for rapidly cut
raw wood into round stock, for turning
bowls and plates, for turning beds,
coves and other detail (Fig 17).
Fig 17
Scraper (B, Fig 16), used for diameter
scraping and to reduce ridges.
Skew Chisel (C, Fig 16), used to
make vees, beads, etc. (Fig 18). The
bevel of scew is parallel to the cut.
Fig 18
Parting tool (D, Fig 16), used to cut
directly into the material, or to make a
cut off. Also used for scraping and to
set diameters.
6.3 Speed selection:
Use low speeds for roughing and for
large diameter work. If vibrations
occur, stop the machine and correct
the cause.
See speed recommendations.
Speed recommendations
Workpiec
e
Diameter
mm
Roughin
g
RPM
Genera
l
Cutting
RPM
Finishin
g
RPM
< 50 1500 3200 3200
50-100 700 1600 2500
100-150 500 1100 1600
150-200 370 800 1200
200-250 300 650 1000
250-300 250 500 800
300-350 220 450 700
350-400 180 400 600
6.4 Turning between centres
With a ruler locate and mark the centre
on each end.
Put a dimple in each end of the shock.
Extremely hard woods may require
kerfs cut into the spur drive end of
stock (see Fig 19).
Fig 19
The spur drive centre locks into the
cleaned spindle taper and can be
removed with the knockout rod (Fig 20)
Fig 20
Mount the centred workpiece between
the spur drive centre and the tailstock
mounted live centre
Turn the tailstock hand wheel until the
live centre well penetrates the
workpiece. Reverse the hand wheel by
one quarter turn and lock the tailstock
spindle.
Turn the workpiece by hand to see if it
rests securely between centres and
can be rotated freely.
For turning between centres the tool
rest is set appr. 3mm higher than
centre line (Fig 21 and 22).

Fig 21
Fig 22
6.5 Bowl turning
Turn outside of bowl between centres.
Turn a short tenon the size of the hole
in the faceplate (A, Fig 23). This will
allow centring the workpiece.
Fig 23
Mount the workpiece (A, Fig 24)
directly to the face plate using 4 wood
screws (C) from the back. Be careful to
use screws short enough not to
interfere with the cutting process but
long enough to hold the workpiece
securely to the face plate.
If screw mounting is not allowed at all,
the work may be glued to a backing
block (D) and the backing block
screwed to the face plate. A piece of
paper in the glue joint will prevent
damaging the wood when separated
later.
Mount the face plate with the
workpiece already attached onto the
spindle nose thread and hand tighten.
Move tailstock away, remove centre
from tailstock to prevent injury.
Turn the workpiece by hand to see if it
rests securely and can be rotated
freely.
Fig 24
For face plate turning the tool rest is
set slightly lower than centreline.
Caution:
Cut with your chisel on the left side of
the turning centre only.
Use left hand to control cutting edge of
gouge, while right hand swings tool
handle around toward your body (Fig
25).
Fig 25
Try to make one, very light continuous
movement from the rim to the bottom
of the bowl to ensure a clean,
sweeping curve through the workpiece.
Move tool support to the exterior to re-
define bottom of bowl.
6.6 Sanding and Finishing
Remove the toolrest and begin with a
fine grit sandpaper (120 grit) and
progress through each grit, using only
light pressure.
Use power sanding techniques to
avoid concentric sanding marks.
Finish sanding with 220 grit.
Apply first coat of finish. Allow to dry
before sanding again with 320 or 400
grit sandpaper.
Turn lathe back on and make a
separation cut through the base. Stop
at about dia. 80mm and use a fine
tooth saw to separate the bowl from
the waste.
Apply additional finish coats and allow
to dry before buffing.
7. Setup and adjustments
General note:
Setup and adjustment work may
only be carried out after the
machine is protected against
accidental starting by pulling the
mains plug.
7.1 Changing speed range
Disconnect the machine from the
power source!
Loosen the locking screw and open the
belt cover.
Loosen the locking handle (A, Fig 26).
Fig 26
Lift up on the tensioning handle (B) to
remove tension from the poly v-belt.
You can now position the belt in the
desired speed range.
Note:
The “High” speed range (0-3200)
provides maximum speed, where as
the “Low” speed range (0-1200) will
provide maximum torque.
Lower the tensioning handle so that
the weight of the motor provides the
needed tension and tighten the locking
handle.
Close and lock the belt cover.

Warning:
The AC Inverter does not require any
programming. It is pre-programmed
from the factory. The buttons and
knob on the face of inverter should not
be changed.
7.2 Headstock spindle lock
Push in pin (E, Fig 27) to keep the
spindle from turning.
Fig 27
Caution:
Never press the spindle lock while the
spindle is turning!
7.3 Headstock spindle index
Thread indexing pin (Fig 28) into one
of the headstock threadholes (A;B;C;D,
Fig 29).
Make sure that it locates in the spindle
hole.
Fig 28
There are 12 holes in the spindle 30°
apart.
Fig 29
The combination of these holes will
allow you to locate your workpiece in
10° or 15° increments (for different
hole patterns see appendix A at the
end of this manual).
7.4 Installing work holding
The faceplate is used for tuning
bowls. There are a number of holes for
mounting the workpiece.
Thread the faceplate onto the spindle
in a clockwise direction, and tighten
two set screws (Fig 30).
Fig 30
Remove the faceplate by loosening
two setscrews. Push in the spindle lock
and use the provided wrench (F, Fig
27).
7.5 Adjusting tool rest
Position the tool rest as close to the
workpiece as possible. Tighten handle
(C, Fig 31) to lock.
Set the height to appr. 3mm above
centreline. Tighten indexable knob (D).
Fig 31
7.6 Adjusting tailstock
Turn the hand wheel (P, Fig 32)
clockwise to move tailstock spindle
forward. Lock tailstock spindle with the
indexable knob (O).
Fig 32
The handle (Q) locks the tailstock in
position on the bed.
The live centre can be ejected by
turning the hand wheel counter-
clockwise.
To screw off the cone (R, Fig 33) the
life center must be locked against
rotation with the supplied pin (S).
Fig 33
The centering pin can be knocked out
to allow deep hole drilling operations.
8. Maintenance and inspection
General notes:
Maintenance, cleaning and repair
work may only be carried out after
the machine is protected against
accidental starting by pulling the
mains plug.
Clean the machine regularly.
Remove any foreign objects from the
heat sinks of AC-drive (Do not obstrukt
the air flow).
Inspect the proper function of the dust
collection daily.
Defective safety devices must be
replaces immediately.
Repair and maintenance work on the
electrical system may only be carried
out by a qualified electrician.
(Warning: Wait five minutes for DC-
bus capacitors discharge before
accessing the AC drive unit!)

8.1 Adjusting bed clamping
If adjustment is needed, remove the
stud (A, Fig 34).
Slide the headstock, tailstock or
toolrest to the edge of the bed and
slightly turn the hex nut (B).
Test the handle to make sure it
securely locks.
Fig 34
8.2 Changing belt and bearings
Changing belt and bearings can be
a difficult task. By chance remove
headstock and take into a repair
station for servicing.
Disconnect the machine from the
power source.
Open the door and remove the belt
from the lower pulley.
Loosen two set screws (A, Fig 35) and
unscrew the handwheel.
Fig 35
Loosen and remove the clamping nut
(B) and lock washer (C).
Use a wood dowel, or aluminium stock
to knock spindle towards the tailstock.
(Use a material that is softer than the
spindle so you do not mushroom end
of spindle).
Go only far enough to remove the belt
from spindle.
To reassemble reverse the procedure.
When reinstalling clamping nut, thread
it on to the spindle until its snug. Then
back off slightly and tighten the lock
washer.
Note:
To remove the pulley for bearing
replacement it is needed to loosen the
2 set screws (C, Fig 36).
Fig 36
Make sure the pulleys are oriented
properly after reassembly for straight
belt runnig.
9. Trouble shooting
Motor doesn’t start
*No electricity-
check mains and fuse.
*Defective switch, motor or cord-
consult an electrician.
*Overload detected on AC-drive unit-
wait and restart machine; chose low
speed range belt setting (0-1200 rpm)
for better torque.
Machine vibrates excessively
*Stand on uneven floor-
adjust stand for even support.
*Workpiece is not properly centred-
*The speed is too high-
10. Available accessories
Stock number 709960
Spindle adapter for 1”x 8TPI
Stock number 708330
Spur drive centre MT2
Stock number 708337
Dead cup centre MT2
Stock number 708332
Face shield
Stock number 709008
8 piece HSS wood turning chisel set
Stock number 6294727B
Bed extension 460mm with toolrest
shaft extension (Fig 37-38)
Fig 37
Fig 38
Stock number 6294732
Heavy outboard turning stand (Fig 39)
Fig 39
Stock number 709911
Face plate 75mm M33x3,5mm
Stock number 709921
Face plate 150mm M33x3,5mm
Stock number 708330
Four toothed live center MT-2

Stock number 708343K
Drill chuck 13 mm, with tapered
mandrell MT-2
Stock number 709960
Adapter M33x3,5 / 1” x 8 TPI
Stock number 708332
Face shield
Refer to the JET-Pricelist
for various tools and work holding.