WEISS WBL290F User manual

WBL290F
11-1/2" x 29" METAL
LATHE with DRO
User Manual

2
TABLE OF CONTENTS
GeneraI Safety Instructions .................................................................................................. 3
Specific Safety Instructions .................................................................................................. 4
Features .................................................................................................................................... 5
PhysicaI Features.................................................................................................................... 6
Set-Up ........................................................................................................................................ 7
Un-Packing & Inventory ........................................................................................................ 7
Proper Grounding.................................................................................................................... 8
Chuck ......................................................................................................................................... 9
Steady Rest .............................................................................................................................. 9
FoIIow Rest .............................................................................................................................. 10
Lathe Bed .................................................................................................................................. 10
Headstock ................................................................................................................................. 10
Gearbox .................................................................................................................................... 1 1
Headstock ControIs ................................................................................................................ 11
Apron .......................................................................................................................................... 12
SaddIe ........................................................................................................................................ 12
Carriage ControIs ................................................................................................................... 12
Lead Screw & Feed Screw ................................................................................................... 13
TaiIstock .................................................................................................................................... 14
TaiIstock ControIs.................................................................................................................... 14
Test Run .................................................................................................................................... 15
Speed Change ........................................................................................................................ 16
LongitudinaI Turning with Auto-Feed ................................................................................ 17
ManuaI LongitudinaI Turning ................................................................................................ 17
Facing and Recesses ............................................................................................................ 17
Turning Between Centers .................................................................................................... 18
Thread Cutting ........................................................................................................................ 18
Change Gears RepIacement................................................................................................ 19
Cross SIide Gib Screws Adjustment ................................................................................. 19
Top SIide Gib Screws Adjustment....................................................................................... 20
Chuck Run-out ........................................................................................................................ 20
Headstock & TaiIstock AIignment ....................................................................................... 2 1
Main SpindIe Bearings .......................................................................................................... 22
Lubrication................................................................................................................................. 22
Gearbox .................................................................................................................................... 22
Change Gears ......................................................................................................................... 23
SaddIe ........................................................................................................................................ 23
Cross SIide................................................................................................................................ 23
Cross SIide Hand wheeI ....................................................................................................... 23
Lead Screw .............................................................................................................................. 24
TaiIstock .................................................................................................................................... 24
Maintenance............................................................................................................................. 24
OptionaI Chip Tray & Stand ................................................................................................. 25
EIectricaI Connections & wiring Diagram ........................................................................ 26
Threading & Feed TabIe ..................................................................................................... 27
TroubIeshooting ...................................................................................................................... 28

3
General Safety Instructions
For Machines
E xtre m e cau tion sh ou ld be u sed w he n op e rating al l po w e r tools. K no w y ou r po w er
tool, be familiar w ith its op era tion , read throug h the user m a n u a l and p ractice sa fe
usage procedures at all times.
Always read and understand the
user manual before operating the
machine.
Connect your machine ONLY to the
matched and specific power source.
Always wear safety glasses
respirators, hearing protection and
safety shoes, when operating your
machine.
Do not wear Ioose cIothing or
jeweIry when operating your machine.
A safe environment is
important. Keep the area free of dust,
dirt and other debris in the immediate
vicinity of your machine.
Be alert ! Do not use prescription or
other drugs that may affect your
ability or judgment to safely operate
your machine.
Disconnect the power source when
changing driII bits, hoIIow chiseIs,
router bits, shaper heads, bIades,
knives, or making other adjustments or
repairs.
Never leave a tool unattended while it
is in operation.
Never reach over the machine when
the tool is in operation.
Always keep blades, knives and bits
sharpened and properly aligned.
All operations must be
performed with the guards in place to
ensure safety.
Always use push sticks and feather
boards to safety feed your work through
the machine and clamp the work-piece
(when necessary) to prevent the work-
piece from any unexpected movement.
Always make sure that any tools used
for adjustments are removed before
operating the machine.
Always keep the bystanders safely
away while the machine is in operation.
Never attempt to remove jammed
cutoff pieces until the saw blade has
come to a fuII stop.

4
W BL290F - M ETAL LATHE
SP EC IFIC SA FETY IN STRU C TIO NS
broken parts, and any other conditions
that may effect the tooIs operation.
Remove adjusting keys and
wrenches. Remove aII the tooIs
used for adjustment before turning
the machine on.
Be careful. Do not put your hand
close to the cutter while the
machine is running.
Never leave the lathe unattended
while it is running.
Do not over-reach. Keep proper
footing and baIance at aII times.
Maintain tooIs with care. Keep
tooIs sharp and cIean for best and
safest performance. FoIIow
instructions given in the manuaI for
Iubrication and repIacing accessories.
Turn the power OFF. Before
making any adjustments, make sure
the switch is in the "OFF" position and
the cord is un-pIugged from the power
outIet.
Make sure you have read and
understood all the safety instructions in
the manual and you are familiar with
your metal lathe, before operating it. If
you fail to do so, serious injury could
occur.
Warning
The safety instructions given abo ve can not be complete because the environ ment in
e ve ry s ho p is d iffe re n t. A Iw a ys c on s id e r sa fe ty firs t a s it ap p Iie s to y ou r in d iv idu a I
working cond itions.
Do not use the lathe in dangerous
environments. Do no expose
the machine to rain. Do not use
the machine in wet Iocations.
Check for dam aged parts. Check
for proper aIignment of moving
parts,
This machine is designed and
intended for use by properly
trained and experienced personnel
only.If you are not familiar with the
proper use of lathes, do not use this
machine untiI proper training and
knowIedge has been obtained.
Keep guards in pIace. Safety guards
must be kept in pIace and in working
order aII the times to ensure safety.
Keep chiIdren and visitors away. AII
chiIdren and visitors shouId be kept at a
safe distance from the work area.
Wear proper apparel. Loose clothing,
gloves, neckties, rings, bracelets, or
other jewelry may get caught in
moving parts. Non-slip footwear is
recommended. wear protective hair
covering to contain Iong hair. Do not
wear any type of gIoves.
AIways use safety gIasses. For the
safety of your eyes, safety gIasses
shouId be used whiIe operating the
Iathe.

5
WBL290F - METAL LATHE
FEATURES
"MODEL WBL290F - 11-1/2" x 29" METAL LATHE WITH VARIABLE SPEED.
As part of the growing Line of WEISS metalworking equipment, we are proud to offer the WBL290F a
11-1/2" x 29" MetaI Lathe with Digital Readout. By following the instructions and procedures Laid out
in this user manual, you wiII receive years of excellent service and satisfaction. The WBL290F is a
professional tool and Iike aII power tooIs, proper care and safety procedures shouId be adhered
to.
Motor...................................................................................................2HP,1.5KW,5000r/min
Swing over bed.............................................................................................11-1/2”(290mm)
Swing over cross slide...................................................................................6-3/4”(1mm)
Distance between center.....................................................................................29”(735mm)
Width of bed..........................................................................................................7”(180mm)
Hole through spindle.........................................................................................1-1/2”(38mm)
Taper in spindle nose......................................................................................................MT5
Number of spindle speeds.........................................................................................Variable
Range of spindle speeds.........................50-900RPM and 10-1800RPM(Variable speeds）
Number of metric threads...................................................................................................12
Range of metric threads.....................................................................................0.4mm-3mm
Number of imperial threads................................................................................................21
Range of imperial threads.......................................................................................8-56T.P.I
Range of cross feed....................................................................0.0015-0.0056”/Revolution
Range of longitudinal.....................................................................0.0025-0.012”/Revolution
Tool post type................................................................Wedge type quick change tool post
Max compound slide travel............................................................................3-3/4”(95mm)
Max cross slide travel......................................................................................6-3/4”(170mm)
Maximum carriage travel......................................................................................23”(580mm)
Tailstovk spindle travel......................................................................................3-3/8”(85mm)
Taper in tailstock spindle.................................................................................................MT3
Overall dimension of the lathe..............................Length 60”x Width 27.5”x Height 21-1/16”
Weight........................................................................................................................510lbs
Warranty.....................................................................................................................Years

6
WBL290F -METAL LATHE
PHYSICAL FEATURES
A. Variable Speed Switch
B. ON/OFF Switch
C. Forward/Reverse Switch
D. Emergency Stop Switch
E. 3-Jaw Chuck
F. American type QCTP
G. Tail Stock Quill Lock Lever
H. Tail Stock
I. Tail Stock Hand Wheel
J. Tail Stock Lock Nut
K. Compound Slide Traverse Lever
L. Lathe Bed
M. Thread Dial Indicator
N. Half Nut Lever
O. Auto Feed Lever
P. Cross Slide Hand Wheel
Q. Carriage Hand Wheel
R. Lead Screw
S. Feed/Thread Selector Knob
T. Oil Sight Glass
U. Feed Rate Selector Knob
V. Feed Direction Selector Knob
W. Chip Tray
X. Change Gear Protective Cover
Y. Threading/Feeding Table

7
SETUP
Before setting up your machine you must
read and understand the instructions given
in this manual.
The unpainted surfaces of this lathe are
coated with a rust preventive waxy oil
and you will want to remove this before
starting assembly. Use a solvent cleaner
that will not damage painted surfaces.
WARNING
WBL290F is a very heavy
machine, do not over-exert
yourself. Use fork truck or other
mechanical devices for safe
moving method
When setting up your machine, you will
want to find an ideal spot where your
metal lathe will most likely be positioned
most of the time.
Figure-1 WBL290F Foot print
UNPACKING
To ensure safe transportation this machine
is properly packaged and shipped
completely in crates. When unpacking,
carefully inspect the crates and ensure
that nothing has been damaged during
transit.Open the crates and check that the
machine and the parts are in good condition.
LIST OF CONTENTS QTY QTY
A. 3-Jaw Chuck 1
B. Change Gears 9
C. Live Center 1
D. Face Plate. 1
E. Steady Rest. 1
F. Follow Rest. 1
G. External Jaws for 3-Jaw Chuck 3
H. Dead Center MT3 (2) 1
I. Reduce Sleeve (No. 5/3). 1
J. Oil Gun 1
K. Toolbox 1
L. Wedge Type Quich Change Tool Post 1
M . W ren che s (8-10 , 12 -14 , 17 -19 ). 3
N. Hex Wrenches (3,4,5,6,8) 5
O. Chuck Keys. 3
P. Screw Drivers (Flat & Cross Head) 2
Q. Lathe with Chip Tray (Not Shown) 1
Figure-2 Inventory
While doing inventory, if you can not find
any part, check if the part is already installed
on the machine. Some of the parts come
assembled with the machine because of
shipping purposes.

8
PROPER GROUNDING
Grounding provides a path of least
resistance for electric current to reduce
the risk of electric shock.
WBL290F is equipped with a 110-V single
phase motor.
To prevent electrical hazards, have a
qualified electrician ensure that the
line is properly wired.
This lathe is for use on a norm al 110 volt
circuit. Make sure that the appliance is
connected to an outlet having the same
configuration as the plug. If an adaptor
plug is used, it must be attached to
themetal screw of the receptacle.
Figure-3 110-Volts Outlet for WBL290F
WARNING
Improper connection of the equipment-
grounding conductor can result in a risk
of electric shock. Check with a qualified
electrician if you are in doubt as to
whether the outlet is properly grounded.
It is strongly recommended not to use
extension cords with your WBL290F
Always try to position your machine
close to the power source so that
you do not need to use extension
cords. When it is necessary to use
an extension cord, make sure the
extension cord does not exceed
50-feet in length and the cord is
12-gauge to prevent motor damage. Y
our WBL290F should be wired with a
plug having 3-prongs to fit a 3 prong
grounded receptacle as shown in
figure-3. Do not remove the grounding
prong to fit it into a 2-pronged outlet.
Always check with a qualified
electrician if you are in doubt.

CHUCK
WBL290F comes equipped with a 160mm,
3-jaw chuck, and a 270mm face plate.
The 3-jaw chuck is a scroll type chuck,
meaning that all three jaws move in
union when adjusted while the 4-jaw
chuck features four independent jaws.
The 4-jaw chuck is used to clamp
square or unevenly shaped work-pieces.
Figure-4 Chuck mounting screws and nuts
When removing the chuck,loosen the hex
nuts,tum the washer counter-clockwise and
pull out the chuck. See figure-4.
STEADY REST
The steady rest supports long, small
diameter stock that otherwise could not be
turned. The steady rest can also replace the
tailstock to allow for cutting tool acces at the
outboard end of your work-piece. To mount
the steady rest:
Secure the steady rest to the lathe bed from
below with a locking plate.
A single cap screw, along with a nut and
washer hold the steady rest in place as
shown in figure-5.
Figure-5 Steady rest
TO SET-UP THE STEADY REST:
Make sure the switch is in the OFF
position and the cord is disconnected
from the power source.
Loosen the hex nuts shown in figure-5.
Loosen knurled screw and open the sliding
fingers until the steady rest can be moved
with its finger around the work-piece.
Secure the steady rest in position.
See figure-5.
Tighten the knurled screw so that the
fingers are snug but not tight against
the work-piece. Tighten three hex
nuts shown in figure-5 and lubricate
the sliding points with machine oil.
9

10
The sliding fingers of the steady rest shown
in figure-5 should receive periodic lubrication
when used, to prevent premature wear.
FOLLOW REST
The follow rest is mounted on the saddle with
two cap screws shown in figure-6 and it follows
the movement of the tuming tool.Only two
sliding fingers are required. The place of the
third finger is taken by turning tool. The follow
rest is used for turning operations on long
slender work-pieces. It prevents flexing of
the work-piece under pressure from the turning
tool.
Set the fingers snug to the work-piece
and make sure not to over tighten. Lubricate
the fingers during operation to prevent
premature wear,
Figure-6 Follow rest installed
LATHE BED
The lathe bed is made of high quality iron
and features high cheeks with strong cross
ribs ensuring low vibration and rigidity.
It integrates the headstock and drive unit,
for attaching the carriage and leads crews. The
two precision ground V-side ways
are re- enforced by heat hardening
and grinding to guide the carriage and
the tailstock accurately. The main
motor is mounted to the rear of the
left side of the bed.
Figure-7 Lathe bed
HEADSTOCK
Made from high quality, cast iron for low
vibration, the headstock is bolted to the
bed with four screws. The headstock
houses the main spindle with two
precision taper roller bearings and
the drive unit.
The main spindle transmits the torque
during the turning process and it also
holds the work-piece and clamping devices.
Figure-8 Headstock

11
GEARBOX
The gearbox is located on the left side of
the lathe and is mounted on the bed. It is
used to select the feeds for straight
turning
as well as for thread cutting. In order to
achieve certain thread pitches, it is
necessary to replace the change gears.
The torque of the work spindle is
transmitted to the feed gears and thus
to the lead screw.
Figure-9 Gearbox
HEAD STOCK CONTROLS
EMERGENCY ON/OFF BUTTON: The
On/Offbuttonallowstostartandstopthe
machine.
Figure-10EmergencyON/OFFbutton
FORWARD / REVERSE SWITCH:
After the machine is switched ON,
turn the switch to "F" position for
counter-clockwise spindle
rotation (forward).
Turn the switch to "R" position for
clockwise spindle rotation (Reverse).
Turning the switch to "O" position
the spindle remains idle.
Figure-11 Forward / Reverse switch
FEED RATE SELECTOR KNOB: Use the
feedrateselectorknobtosetthedesired
feedorthreadrates.Seefigure-12.
FEED THREAD SELECTOR KNOB: For
threadselecting,shifttheknobtotheleft
andforfeedselecting,shifttheknobto
theright.Seefigure-12.
FEED DIRECTION SELECTOR KNOB:
Selectthecarriagetraveldirectionwhenthe
chuckisrotatingintheforwarddirection
orcounter-clockwiseasviewedfromthe
frontofthechuck.

12
Figure-12 Gearbox controls
V AR IA B LE S P EE D CO N TR O L K N O B :
Tum the knob clockwise to increase the spindle
speed and counter-clockwise to decrease the
spindle speed. The possible speed range is
dependent on the position of the drive belt.
See figure-13.
Figure-13 Variable speed control knob
APRON
The apron is mounted to the saddle and to
the front side of the bed and it houses the
half nut with an engaging lever for activating
the automatic feed. The half nut gibs can
be adjusted from the outside.
SADDLE
The saddle is made from high quality cast
iron and all sliding parts are smoothly
ground to fit the V on the bed without play.
Figure-14 Saddle and apron
CA R R IA G E C ON T RO LS
The carriage allows the cutting tool to move
along the length of the lathe bed .The cross
slide allows the cutting tool to travel
perpendicular to the bed. The carriage
features a top slide which allows linear
movement of the cutting tool at any
preset angle .This section will review the
individual controls on the carriage and
provide descriptions of their uses.
LO N G IT UD IN A L T RA V E L HA N D W H EE L :
Tuning the longitudinal hand wheel, moves
the carriage left or right along the bed .The
control is helpful when setting up the
machine for turning, when manual movement
is desired during turning operations.
See figure-15.
CR O S S S LID E HA ND W H EE L :
Turning the cross slide hand wheel, moves the
cross slide towards or away from the work
piece. The graduated scale can be adjusted

13
using the same method as the longitudinal
scale. See figure-15.
Top slide hand wheel:The top slide
hand wheel controls the position of the
cutting tool relative to the work-piece .The
top slide is adjustable for angle as well as
longitudinal travel. It can be adjusted a full
360。if needed. See figure- 15.
Tool post:A wedge type quick change
post is supplied with WBL290F. Cutting
tooIs can be attached and removed by
tightening or Ioosening thecIamping boIt.
Seefigure-15.
Figure-15 Carriage controIs
Auto feed selector lever:Moving this
lever upward engages the automatic
longitudinal feed. Moving this lever down
engages the automatic traverse feed. See
figure-16.
Warning
Do not simultaneously engage the feed
lever and the threading lever.Doing so will
damage the lathe.
Half nut lever:This lever engages and
disengages the half nut on the lead
screw. The lever is only engaged while
turning threads in stock. A lockout device
feature in the lever mechanism engages
when the feed selector is used.
Threading dial indicator: This indicator
tells you when to engage the half nut for
threading process. See figure-16.
Figure-16 Carriage controIs
Lead screw and feed screw
The lead screw and feed screw are
mounted on the front of the machine bed. It
is connected to the gear box at the left for
automatic feed and is supported by bearing
on both ends.
Figure-17 Lead screw and feed screw

14
Tailstock
The taiIstock slides on a V-way and can be
champed at any location. The tailstock has
a heavy duty spindle and the spindle can
be clamped at any location with a
clamping lever. The spindle is moved
with a hand wheel at the end of the
taiIstock.
Figure-18 TaiIstock
Make sure to install the securing screw at
the end of the lathe as shown in figure-19 in
order to prevent the taiIstock from falling off
the lathe bed.
Figure-19 Installing the securing screw on
the lathe bed
Tailstock Controls
Tailstock Hand Wheel: Turning the
hand wheeI advance or retracts the quill in
the taiIstock. The graduated scale on the
hand wheel is adjustable. See figure-20.
Quill Lock Lever: This Iock lever locks the
qull in position when tightened. See
figure-20.
Tailstock Lock Lever: Turn this lock lever
up to lock and down to unlock the tailIstock
in position on the lathe bed. See figure-20.
Adjustment Screw: This set screw is
used to align the taiIstock with the
headstock. See page-20 for details on
Center Alignment.
Figure-20 TaiIstock controIs

15
Test Run
Once you have assembled your lathe
completely, it is then time for a test run to
make sure that the lathe works properly and
is ready for operation.
Remove all the tools used for assembling
the machine and make sure all the guards
are in place.
Waring
Before starting the lathe,make sure that you
read and understood the manual and you
are familiar with the function and safety
features on this machine.Failure to do so
may cause serious personal injury.
To ensure the carriage controls do not
move unexpectedly when the lathe is
started, rotate the feed direction selector
knob so that the arrow is pointing to the
middle (neutral) position as shown in figure-
21.
Figure-21 Feed direction seIector knob
Connect the cord to the power outlet and
turn the machine ON.
while test running the machine, check the
following:
The Emergency Stop & ON/OFF buttons
are working properly.
The chuck and jaws are properly secured
and working properly.
While the machine is running, turn
the variable speed control knob
clockwise to make sure it is working
properly.
Let the machine run for 10 minutes at the
Low Speed.
During the test run if there is any unusual
noise coming from the lathe or it vibrates
excessively, turn OFF the power switch
immediately and disconnect from the power
source Investigate if you can find out the
problem with your machine. See page-28
for troubleshooting.
If the machine is running smoothly, proceed
to the next step.
Change the belt for High Speed and let the
machine run for another 10 minutes. See
page-16 for details on speed change.
Turn the machine OFF and turn the
Forward1Reverse switch to "R" position.
Turn the machine back ON and make sure
the spindle is rotating clockwise (reverse).
Waring
Do not make and adjustment while the
machine it running. Failure to follow this
warning can cause serious personal
injuries to the operator and damage to the
machine.

16
Speed change
The rotating speed of the headstock is
controlled by the positioning of the belts on
the pulleys. These are accessed by
removing the protective cover on the end of
the headstock.
Refer to the Threading & Feeding Table for
Lathe on page-27 or the plate on the
headstock to determine which belt
combinations produce what speeds. The
speed settings available on the WBL290F
are 50 - 850 RPM and 110 - 1800 RPM.
To Change The Spindle Speed
Unscrew the two fastening knobs shown in
figure-22 and remove the protective cover.
Figure-22 Removing the cover
Loosen the four nuts and screws shown in
figure-23 and move the motor mounting
pulley to release the tension on the belt.
Once the belt tension is released, reposition
the belt on the pulleys grooves for high or
low spindle speed.
Figure-23 Screws and nuts securing the
motor mounting plate
Position the belt on the pulleys for high and
low speed according to figure-24.
The low spindle speed is 50 - 850 RPM
while the high spindle speed is 110 - 1800
RPM.
Figure-24 BeIt position on the puIIeys
Once the belt is on the right grooves, move
the motor pulley back to its position to
tension the belt. Re-tighten the screws and
nuts removed.
Important
we suggest selecting the low speed. It
provides stronger torque while operation.

17
Longitudinal Truing With
Auto.Feed
Set the feed direction selector knob and
feed rate selector knob shown in figure-25
to select the feed direction and feed speed.
Figure-25 Feed rate selector knob, feed
direction selector knob and chart
Use the chart on the lathe for selecting
the feed speed or the thread pitch. Select
the proper gear set if the required
feed or thread pitch can not be obtained
with the installed gear set. Automatic
feed is accomplished by moving the
auto feed lever up. See figure-26.
Figure-26 Auto feed seIector Iever
Manual Longitudinal
Turning
In this turning operation, the tooI feeds
paraIIeI to the axis of rotation (IongitudinaI)
of the work-piece. ManuaI feed is
accompIished by turning the carriage hand
wheeI on the Iathe apron or the top sIide.
The cross feed for the depth of cut is
achieved using the cross sIide. See figure-
27.
Figure-27 Straight turning
Facing And Recesses
In the facing operation, the tool feeds
perpendicular to the axis of rotation of the
work-piece. The feed is made manually with
the cross slide hand wheel. The depth of
cut is made with the top slide. See figure-
28.
Figure-28 Facing & dressing

18
Turning Between Centers
For turning between centers, it is necessary
to remove the chuck from the spindle. Fit
the MT3 center into the 5/3 reducing sleeve
(provided) and fit the reducing sleeve into
the spindle taper.
Mount the work-piece fitted with the driver
dog between the centers. The driver is
driven by a catch or face plate. See figure-
29.
Figure-29 Turning between centers
Important
Always use a small amount of grease
on the tailstock center to prevent
center tip from over heating.
Thread Cutting
SeveraI different threads can be cut using
the proper combination of gears and
settings.
Imperial Thread: when cutting inch
threads, the half nut and threading dial are
used to thread in a conventional manner.
The threading and feeding table on page-27
or on the headstock, specifies at which
point a thread can be entered using the
threading dial.
Metric Thread: The only difference in
metric thread cutting is that the half nut
must remain engaged during the entire
threading process. The thread dial can not
be utilized.
Figure-30 HaIf nut and threading diaI
Set the machine up for the desired thread
pitch.
Start the machine and engage the half nut.
when the tool reaches the end of the cut,
stop the machine by turning the motor off
and at the same time back the tool out off
the work-piece so that it clears the thread.
Do not disengage the half nut lever.
Reverse the motor direction allowing the
cutting tool to traverse back to the starting
point.
Repeat these steps until you have obtained
resuIts.

19
Left And Right Thread Cutting: The left
and right thread cutting is done using
the feed direction selector knob.
Turning the feed direction selector knob
counter-clockwise, cuts left thread while
turning it clockwise, cuts right thread.
Important
We suggest selecting the low speed. It
provides stronger torque while
operation.
Change gears replacement
To replace the change gears:
Make sure the switch is in the OFF position
and the cord is unplugged from the power
outlet.
Unscrew the two fastening knobs and
remove the protective cover to access the
change gears.
Unscrew the bolt from the lead screw and
the square nuts shown in figure-31 from the
quadrant bolts in order to remove the
change gears.
Figure-31 Change gears repIacement
Select the proper gear set according to your
requirements from the feed table given on
the lathe (See page-27 Threading &
Feeding Table for details) and install it onto
the quadrant using nuts removed.
Re-instaII the protective cover.
Gibs Adjustment
There are two main gib screws adjustment
for the machine; the cross slide gib screws
and the top slide gib screws.
Warning
Make sure the switch is in the OFF
position and the cord is disconnected
from the power source before making
any adjustments.Failure to do so can
result serious personal injury
Cross Slide Gib Screws
Adjustment
The adjustment gibs are located on the left
side of the cross slide. To adjust gib, loosen
the nuts holding the gibs. Tighten the gibs
until excess movement is eliminated and
retighten the nuts. See figure-32.
Figure-32 Cross sIide adjustment gib
screws

20
Top Slide Gibs Adjustment
Locate the adjustment gibs on the side of
the top slide as shown in figure-36. Loosen
the nuts holding the gibs and then tighten
the gibs until excess movement is
eliminated. Once all the gibs are tightened
properly, re-tighten the nuts.
Remove the bolts, securing the back plate
to the chuck. Tap along the edge of the
mounting shoulder until the chuck and back
plate are free of each other and thread back
plate onto the spindle.
Remove about 0.12mm of material from the
surface that the chuck mounts to. Be
careful not to remove any material from the
diameter of the shoulder. See figure-34.
Figure-33 Top sIide adjustment gibs screws
Figure-34 Turning the back pIate
Chuck Run-Out
If your lathe requires a higher level of
accuracy, you may find it necessary to
true-up the chuck to ensure minimum run-
out. To check and correct the chuck run-out:
Mount a piece of bar stock in the chuck.
The stock should protrude approximately
50mm.
Use a dial indicator and measure the run-
out at the end of the bar. In most cases, the
amount of run-out will not exceed 0.12mm
over 50mm which should be accurate
enough for most applications. If the run-out
on the chuck is excessive (e.g. greater than
0.15mm), the excess run-out should be
eliminated.
Start by removing the chuck.
Install the chuck onto the back plate and
check the run-out. If the run-out is not within
an acceptable range, it may be necessary
to turn a new shoulder on the back plate.
Before turning a new shoulder, measure the
diameter of the recess in the back of the
chuck accurately.
Remove approximately one half of the
thickness of the shoulder (approximately
1.5mm). Remove the same thickness off
the face of the mounting surface.
Figure-35 Turning new shouIder on back