7” x 10” Mini Lathe
Model 33684
Assembly and Operating Instructions
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
Copyright 2000 by Harbor Freight Tools®. All rights reserved. No portion of this
manual or any artwork contained herein may be reproduced in any shape or form
without the express written consent of Harbor FreightTools.
For technical questions and replacement parts, please call 1-800-444-33534.
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Operation
1. Never force the tool or attachment to
do the work of a larger industrial tool. It is
designed to do the job better and more
safely at the rate for which it was intended.
2. Do not carry the tool by its power
cord.
Check to see if your tool has a two or three-
prong plug. If your tool has a two-prong plug,
you may proceed past the next paragraph. If
your tool has a three-prong plug, please continue
reading the following precautions and instruc-
tions.
3. Always unplug the cord by the plug.
Never yank the cord out of the wall.
4. Always turn off the machine before
unplugging.
IF THERE IS ANY QUESTION
ABOUT A CONDITION BEING
SAFE OR UNSAFE, DO NOT
OPERATE THETOOL!
If the tool or machine has a three-prong plug, the
third (round) prong is the ground. Plug this cord
only into a three-prong receptacle. Do not
attempt to defeat the protection the ground wire
provides by cutting off the round prong. Cutting
off the ground will result in a safety hazard and
void the warranty.
Grounding Instructions and
Voltage Warning
If a three-prong receptacle is not available, you
may use an adapter, but you must then connect
the green ear on the adapter to the outlet.
Unscrew the center screw of the outlet cover
and put the screw through the green ear. Plug
the adapter’s two prongs into the outlet, and
replace the center screw. Now plug the tool or
machine into the adapter.
Common household current is 110-120 volts.
As long as your tool is rated from 110-120V
there will be no complications using this tool
with household receptacles. NEVER try to
plug a 110-120V tool into a 220-240V circuit
(or vice-versa) or serious complications and
possible serious injury to the operator can
occur. The plugs have different shapes to
DO NOT MODIFY THE PLUG IN ANY
WAY. IFYOU HAVEANYDOUBT, CALL
A QUALIFIED ELECTRICIAN.
prevent this.
____________________________________________________________________________
Extension Cords
If your tool is double insulated and has a two-prong plug, you may use either a two or three-prong
extension cord. If your tool has a grounded, three-prong plug, you must use a three-prong extension
cord with three-prong receptacles. Only use rounded jacket extension cords listed by the Under-
writers Laboratories (UL). If you are using the tool outdoors, use an extension cord rated for
outdoor use (signified by “WA” on the jacket).
The extension cord must have a minimum wire size depending on the amperage of the tool and the
length of the extension cord. The size is determined by itsAWG (AmericanWire Gauge) rating. The
smaller the gauge, the greater the cable’s capacity. The amount of cords used does not matter. Total
length determines the minimumAWG rating. Every cord must meet theAWG rating. Use the chart
below to determine whatAWG rating is required for your situation. Cord length is rated in feet.
Harbor Freight Tools can supply ULlisted and outdoor rated extension cords in multipleAWG
ratings if needed.
AMP
Total Extension Cord Length In Feet
Rating
25’
50’
75’
100’ 125’ 150’ 175’ 200’
0.0 -10.0
10.1-13.0
13.1-15.0
15.1-18.0
18
16
14
14
18
16
14
12
16
14
12
12
16
14
12
12
14
14
12
12
14
12
12
12
12
12
12
--
12
12
--
--
SKU #33684
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Additional Safety Rules for Mini Lathe
1. Before turning on the motor, make sure
that proper lubrication is included (see page
of this manual).
2. Always dismount the chuck and lathe’s
face plate by hand. Do not use power tools
to perform these tasks.
3. After the chuck is installed, remove the
wrenches and tools to eliminate the possi-
bility of accident when the lathe is turned
on.
when the lathe is on. Never check the
sharpness of the cutter by using your hand.
5. Avoid accidents resulting from broken
workpieces. Never use an excessively large
tool cutter to do feeding with a large
workpiece.
6.Never change the gear when the lathe is in
operation.
7. Always keep a safe distance from the lathe
to minimize the risk of being struck by a
broken workpiece.
4. Never adjust or fix workpieces or any
rotating parts when the lathe is on. Never
use instruments to measure the workpiece
____________________________________________________________________________
Thank you for choosing a Harbor Freight Tools product! For future reference, please
complete the owner’s record below:
Model:_______________ Serial Number:_________________ PurchaseDate:__________
SAVE THE RECEIPT, WARRANTYAND THESE INSTRUCTIONS. It is important that you
read the entire manual to become familiar with the unit BEFORE you begin assembly.
____________________________________________________________________________
Technical Specifications
Motor:
3/4 Horsepower
Power Source:
Lathe Specifications:
110V, Single Phase
Drive: Gear and Belt
Swing Over Bed: 7”
Distance Between Centers: 10”
Spindle Bore: 3/4”
QuillTravel: 2”
Cross Slide Travel: 2 3/4”
Cross Slide Swing: 4 1/2”
Work Tolerance: .005”
Bed Dimensions: 15 7/8” long, 3 1/4” wide
Saddle Travel: 6 7/8”
CompoundTravel: 2 7/8”
SKU #33684
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Unpacking
Carefully unpack the Mini Lathe and check all items. Figure 1 below shows all the contents of the
carton. Do not discard any packing material until the Mini Lathe is fully assembled and operational.
If any parts are missing or broken, please call Harbor Freight Tools at 1-800-444-3353. Be sure
you have all parts described in the parts listing on page .
Identification of Main Components
A. Lathe
D. Chuck
B. Chuck Key
E. Chuck Set Screws
C. External Jaws
F. Internal Jaws
SKU #33684
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Mini Lathe Features
1.15. Feeding Control Wheel
1. Power Switch
16. Cross Feeding Crank
17. Automatic Feeding Handle
18. Thread Dial Indicator
19. Bed Way
2. Power lamp
3. Fuse
4. Speed Control Knob
6. Chuck
20. Lead Screw
7. Compound Rest
8. Tool Post
9. Fixed Center
10.Tailstock Quill Fix Holder
11. Tailstock
21. Rear Splash Guard
22. Feeding Direction Selector
23. Power Cord
24. Chip Tray
25. Motor Cover
26. H/L Gear Shift Lever
27. End Cover
12. Tailstock QuillAdjust Handwheel
13. Tailstock Set Screw
14. Compound Rest Crank
SKU #33684
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Adjusting the Mini Lathe
1. Clean off the protective grease on the Mini Lathe.
2. Check to see that the three set screws on the chuck are tight.
3. Turn the chuck by hand and check that it rotates freely.
4. Move the Feeding Direction Selector (located on the back of lathe) to the middle.
5. Make sure the Switch (#1 in figure 4 below) is at the OFF position.
WARNING: ADJUST THE SPEED CONTROL KNOB (#4) BY TURNING IT TO
ZERO. BEFORE TURNING ON THE MINI LATHE EACH TIME IT IS TO BE USED,
THIS SPEED CONTROLKNOB MUST BEAT ZERO.
6. Plug in the electrical cord and turn the Switch to the ON position and run the lathe for 3 minutes.
When the lathe is on, the Power Lamp (#2) will remain on. Check to see that the lathe operates
normally.
7. Check the Compound Rest Crank and the Cross Feeding Crank to see that they work properly.
If the cranks are too tight or too loose, turn the adjusting screws located at both sides (see figure 5
below).
WARNING: THE MINI LATHE MUST BE COMPLETELYSTOPPED BEFORE
CHANGINGFORWARD/REVERSE DIRECTION.
Replacement of Chuck
When replaceing the chuck, place a cloth or a piece of wood on the bedway at the bottom of the
chuck. This step will help avoid damage to the bedway caused by carelessly dropping the chuck.
To replace the chuck, loosed the 3 set screws as shown in figure 6 below.
SKU #33684
Rev 01/99
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Replacement of Jaws
There are two types of jaws: the internal
jaws and external jaws. Please note that the
number of jaws fit with the number inside the
chuck’s groove. Do not mix them together.
If the jaws do not fit well together, you will need to
reassemble them again.
When mounting a workpiece, it is recommended
that all three jaws are loosened at the same time.
This will protectthe threads inside.
When you are going to mount the jaws,
mount them in ascending order. When they
are taken out, make sure to take them out in
descending order (3-2-1) one by one. After
you finish this procedure, rotate the jaws to
the smallest diameter and check that the three
jaws are well fitted (see figure 7).
Compound Rest Adjustment
To adjust the compound rest, loosen the two
screws as shown in figure 8 (A). After adjusting
to the required angle, tighten the screws.
Tailstock Rest Adjustment
To change position or replace the tailstock, loosen the nut as shown in (A) of figure 9.
Replacement of Carbon Brushes
To replace, remove brush covers on the motor cover (A) in figure 10-A, and the right bottom side of
speed controller as shown in (B) of figure 10-B.
SKU #33684
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Tool Post Adjustment
Loosen the lever shown in (B) of figure 11,
the adjust the tool post position. Once the
adjustment is made, re-tighten the lever. To
replace the work cutter, loosen the screws
(A) with the allen wrench provided.
Threading
Select the feeding direction selector to the
thread direction desired. Then press down
handle (A) in figure 12 by matching the right
calibrations on the thread dial indicator (B)
and continue with the automatic threading
procedure. When threading, never try to
change the direction.
Automatic Feeding
Adjust the feeding direction selector to the
direction you desire. Press down the handle
(A) in figure 12, and continue with the
automatic feeding procedure. When
feeding, never try to change the feeding
direction.
Operation
1. Use the chuck to hold the workpiece
firmly (figure 13 below). Then, use the rolling
center to fix the other end. If you change the
rolling center to drilling chuck you start your
drillingimmediately.
2. Use the chuck to hold the workpiece firmly
and cutter to start lathe’s face cutting (figure
14). The edge of the cutter must be at the
same height as the center.
SKU #33684
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3. By changing the tool post angle and adjusting the compound rest, you can do internal cutting
(figure 15).
4. After adjusting the angle of the compound rest, you can do bevel cutting (figure 16).
Set-Up Instructions for Threading Gears
By changing the gear set-up it is possible to cut any thread size. The factory set-up for Mini Lathe
gears is as follows (see illustration below):
A
A
Position A= 20T
Position B= 80T
Position C= 20T
Position D= 80T
B
C
C B
D
D
To change the thread size, use the gear box settings shown on the table on the next page.
SKU #33684
Page 10
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Gear Settings for Various Thread Sizes
Threads
Per Inch
Stud Gear Box
Threads
Per Inch
Stud Gear Box
A
B
C
D
A
B
C
D
12
40
30
38
20
50
60
57
13
14
16
18
19
20
22
24
26
28
32
36
40
40
40
40
40
40
40
40
40
20
20
20
65
60
30
35
40
45
57
50
55
60
65
35
40
45
40
44
48
52
56
64
72
76
80
88
96
104
20
20
20
20
20
20
20
20
20
20
20
20
50
55
60
65
60
40
40
57
40
40
40
40
50
60
35
40
45
50
50
55
60
65
30
20
20
30
20
20
20
20
Example: To cut 12 threads per inch (see illustration below), use 40T in positionA, 30Tin
position D, and put any other gear is position B to connect A and D.
A
A
B
B
D
D
A
B C
D
A
C B
D
Example: To cut 38 threads per inch (see illustration above), use 20Tin position
A, 57T in position D, 50T in position B, and 60T in position C.
SKU #33684
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SKU #33684
Page 13
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SKU #33684
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Parts Diagram
SKU #33684
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Additional Set-Up Instructions for Threading Gears
When the lathe is ON and the Spindle is revolving, the threaded bar and the Thread Dial Indicator
will also be revolving (see below).
Thread Dial Indicator
Indicator Housing
Top View
Thread Indicator Housing
Insure that the Alignment Mark is lined up with the
Thread Dial Indicator before operation.
Move the cutting blade to the proper position, and adjust theThread Dial Indicator to the desired
mark. Pull down the Handle and the Mini Lathe starts threading automatically.
Remember: After thread cutting operation is complete, change back to the factory set-up gear
setting:
Position A= 20T
Position B= 80T
Position C= 20T
Position D= 80T
SKU #33684
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SKU #33684
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PACKING LIST
No. Description
Qty
Part No.
1
7” x 10” Mini Lathe
1 piece
3 piece
1 piece
1 piece
10 pieces
2 pieces
4 pieces
1 piece
1 piece
4 pieces
2 pieces
1 copy
2
Chuck external jaws
Chueck Key
3
4
Fuse 5A
5
Gear Z: 30, 35, 40, 40, 45, 50, 55, 57, 60, 65
Double head wrench 8-10, 14-17
Inside six horn wrench S: 3, 4, 5, 6
Oil can
6
7
8
9
Center MT: 2
143
125
85
10
11
12
13
14
Rubber
Knob
Instruction Manual
Wiring Diagram of Control Circuit
Warranty Document
1 copy
1 copy
SKU #33684
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SCHEMATIC DIAGRAM
Fuse
Potentiometer
Switch 2
Switch 1
Motor
110V/60Hz
SKU #33684
REV 08/04
Page 18
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