Harbor Freight Tools Lathe 33684 User Manual

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  
Page 3  
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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  
Page 8  
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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  
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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  
Page 12  
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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  
Page 17  
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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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