Wen 3921 User Manual

16" VARIABLE

SPEED SCROLL SAW

Model # 3921

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IMPORTANT:

Your new tool has been engineered and manufactured to WEN’s highest standards for dependability,
ease of operation, and operator safety. When properly cared for, this product will supply you years
of rugged, trouble-free performance. Pay close attention to the rules for safe operation, warnings,
and cautions. If you use your tool properly and for intended purpose, you will enjoy years of safe,
reliable service.

NEED HELP? CONTACT US!

Have product questions? Need technical support?

Please feel free to contact us at:

800-232-1195

(M-F 8AM-5PM CST)

[e-mail]

WENPRODUCTS.COM

TABLE OF CONTENTS

Technical Data

General Safety Rules
Specific Safety Rules For Scroll Saw

Electrical Information
Know Your Scroll Saw

Assembly and Adjustments
Operation
Maintenance

Exploded View and Parts List
Warranty

TECHNICAL DATA

Model Number:
Motor:
Speed:
Throat Depth:
Blade:
Blade Stroke:
Cutting Capacity:
Table tilt:
Overall dimensions:
Weight:
Includes:

2
3
5
6
8
9
15
19
20
22

3921

120 V, 60 Hz, 1.2 A

550 to 1600 SPM

16˝

5˝ pinned & pinless

9/16˝

2˝ at 90°

0° to 45° left

26 - 3/8˝ by 13˝ by 14 - 3/4˝

27.5 lb
15 TPI Pinned Blade
18 TPI Pinned Blade

18 TPI Pinless Blade

2

GENERAL SAFETY RULES

Safety is a combination of common sense, staying alert and knowing how your item works.

SAVE THESE SAFETY INSTRUCTIONS.

WARNING: To avoid mistakes and serious injury, do not plug in your tool until the following steps

have been read and understood.

1. READ and become familiar with this entire instruction manual. LEARN the tool’s applications, limitations, and
possible hazards.

2. AVOID DANGEROUS CONDITIONS. Do not use power tools in wet or damp areas or expose them to rain.
Keep work areas well lit.

3. DO NOT use power tools in the presence of flammable liquids or gases.

4. ALWAYS keep your work area clean, uncluttered, and well lit. DO NOT work on floor surfaces that are slippery

with sawdust or wax.

5. KEEP BYSTANDERS AT A SAFE DISTANCE from the work area, especially when the tool is operating.
NEVER allow children or pets near the tool.

6. DO NOT FORCE THE TOOL to do a job for which it was not designed.

7. DRESS FOR SAFETY. Do not wear loose clothing, gloves, neckties, or jewelry (rings, watches, etc.) when op­erating the tool. Inappropriate clothing and items can get caught in moving parts and draw you in. ALWAYS wear
non-slip footwear and tie back long hair.

8. WEAR A FACE MASK OR DUST MASK to fight the dust produced by sawing operations.

WARNING: Dust generated from certain materials can be hazardous to your health. Always oper­ate the tool in a well-ventilated area and provide for proper dust removal. Use dust collection systems
whenever possible.

9. ALWAYS remove the power cord plug from the electrical outlet when making adjustments, changing parts,
cleaning, or working on the tool.

10. KEEP GUARDS IN PLACE AND IN WORKING ORDER.

11. AVOID ACCIDENTAL START-UPS. Make sure the power switch is in the OFF position before plugging in
the power cord.

12. REMOVE ADJUSTMENT TOOLS. Always make sure all adjustment tools are removed from the saw before
turning it on.

13. NEVER LEAVE A RUNNING TOOL UNATTENDED. Turn the power switch to OFF. Do not leave the
tool until it has come to a complete stop.

14. NEVER STAND ON A TOOL. Serious injury could result if the tool tips or is accidentally hit. DO NOT store

anything above or near the tool.

3

GENERAL SAFETY RULES

15. DO NOT OVERREACH. Keep proper footing and balance at all times. Wear oil-resistant rubber-soled foot­wear. Keep the floor clear of oil, scrap, and other debris.

16. MAINTAIN TOOLS PROPERLY. ALWAYS keep tools clean and in good working order. Follow instruc­tions for lubricating and changing accessories.

17. CHECK FOR DAMAGED PARTS. Check for alignment of moving parts, jamming, breakage, improper
mounting, or any other conditions that may affect the tool’s operation. Any part that is damaged should be properly
repaired or replaced before use.

18. MAKE THE WORKSHOP CHILDPROOF. Use padlocks and master switches and ALWAYS remove start­er keys.

19. DO NOT operate the tool if you are under the influence of drugs, alcohol, or medication that may affect your
ability to properly use the tool.

20. USE SAFETY GOGGLES AT ALL TIMES that comply with ANSI Z87.1. Normal safety glasses only have
impact resistant lenses and are not designed for safety. Wear a face or dust mask when working in a dusty environ­ment. Use ear protection such as plugs or muffs during extended periods of operation.

SPECIFIC RULES FOR THE SCROLL SAW

WARNING: Do not operate the scroll saw until it is assembled and adjusted. Do not operate the scroll
saw until you have read and understood both the following instructions and the warning labels on the
scroll saw.

BEFORE OPERATING:

1. Check for both proper assembly and proper alignment of moving parts.

2. Understand the function and proper use of the ON/OFF switch.

3. Know the condition of the scroll saw. If any part is missing, bent, or does not operate properly, replace the com­ponent before attempting to operate the scroll saw.

4. Determine the type of work you are going to be doing. Properly protect your body including your eyes, hands,

face, and ears.

5. To avoid injury caused by pieces thrown from accessories, use only recommended accessories designed for this
saw. Follow the instructions supplied with the accessory. The use of improper accessories may cause risk of injury.

6. To avoid contact with rotating equipment:

- Do not put your fingers in a position where they risk contacting the blade if the work piece unexpectedly
shifts or your hand unexpectedly slips.

- Do not cut a work piece too small to be held safely.

- Do not reach under the scroll saw table when the motor is running.

- Do not wear loose clothing or jewelry. Roll long sleeves above the elbow. Tie back long hair.

4

SPECIFIC RULES FOR THE SCROLL SAW

7. To avoid injury from accidental startups of the scroll saw:

- Make sure to turn OFF the switch and unplug the power cord from the electric outlet before changing the
blade, performing maintenance or making adjustments.

- Make sure the switch is OFF before plugging in the power cord to an electric outlet.

8. To avoid injury from a fire hazard, do not operate the scroll saw near flammable liquids, vapors or gases.

9. To avoid back injury:

- Obtain help when raising the scroll saw more than 10 inches (25.4 cm). Bend your knees when lifting the

scroll saw.

- Carry the scroll saw by its base. Do not move the scroll saw by pulling on the power cord. Pulling on the
power cord could cause damage to the insulation or the wire connections resulting in electric shock or fire.

WHEN OPERATING THE SCROLL SAW

1. To avoid injury from unexpected scroll saw movement:

- Use the scroll saw on a firm level surface with adequate space for handling and supporting the work piece.

- Be sure the scroll saw cannot move when operated. Secure the scroll saw to a workbench or table with
wood screws or bolts, washers and nuts.

2. Before moving the scroll saw, unplug the power cord from the electrical outlet.

3. To avoid injury from kickback:

- Hold the work piece firmly against the tabletop.

- Do not feed the work piece too fast while cutting. Only feed the work piece at the rate the saw will cut.

- Install the blade with the teeth pointing downward.

- Do not start the saw with the work piece pressing against the blade. Slowly feed the work piece into the
moving blade.

- Use caution when cutting round or irregularly shaped work pieces. Round items will roll and irregularly
shaped work pieces can pinch the blade.

4. To avoid injury when operating the scroll saw:

- Obtain advice from a qualified person if you’re not thoroughly familiar with the operation of scroll saws.

- Before starting the saw, make sure the blade tension is correct. Recheck and adjust tension as needed.

- Make sure the table is locked into position before starting the saw.

- Do not use dull or bent blades.

- When cutting a large work piece, make sure the material is supported at the table height.

- Turn the saw OFF and unplug the power cord if the blade jams in the work piece. This condition is usually
caused by sawdust clogging the line you are cutting. Wedge open the work piece and back out the blade after
turning off and unplugging the machine.

5

ELECTRICAL INFORMATION

GROUNDING INSTRUCTIONS

IN THE EVENT OF A MALFUNCTION OR BREAKDOWN, grounding provides the path of least resistance
for an electric current and reduces the risk of electric shock. This tool is equipped with an electric cord that has an
equipment grounding conductor and a grounding plug. The plug MUST be plugged into a matching outlet that is
properly installed and grounded in accordance with ALL local codes and ordinances.

DO NOT MODIFY THE PLUG PROVIDED. If it will not fit the outlet, have the proper outlet installed by a
licensed electrician.

IMPROPER CONNECTION of the equipment grounding conductor can result in electric shock. The conduc­tor with the green insulation (with or without yellow stripes) is the equipment grounding conductor. If repair or
replacement of the electric cord or plug is necessary, DO NOT connect the equipment grounding conductor to a
live terminal.

CHECK with a licensed electrician or service personnel if you do not completely understand the grounding instruc­tions or whether the tool is properly grounded.

USE ONLY THREE-WIRE EXTENSION CORDS that have three-pronged plugs and outlets that accept the
tool’s plug as shown in Fig. A. Repair or replace a damaged or worn cord immediately.

CAUTION: In all cases, make certain the outlet in question is properly grounded. If you are not sure,
have a licensed electrician check the outlet.

WARNING: This tool is for indoor use only. Do not expose to rain or use in damp locations.

AMPERAGE

1.2 A 18 gauge 16 gauge 16 gauge 14 gauge

Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy
enough to carry the current your product will draw. An undersized cord will cause a drop in line voltage resulting
in loss of power and overheating. The table below shows the correct size to be used according to cord length and
nameplate ampere rating. When in doubt, use a heavier cord. The smaller the gauge number, the heavier the cord.

Make sure your extension cord is properly wired and in good condition. Always replace a damaged extension cord
or have it repaired by a qualified person before using it.

Protect your extension cords from sharp objects, excessive heat and damp/wet areas.

Use a separate electrical circuit for your tools. This circuit must not be less than a #12 wire and should be protected
with a 15 A time-delayed fuse. Before connecting the motor to the power line, make sure the switch is in the OFF
position and the electric current is rated the same as the current stamped on the motor nameplate. Running at a
lower voltage will damage the motor.

REQUIRED GAUGE FOR EXTENSION CORDS

25 ft. 50 ft. 100 ft. 150 ft.

WARNING: This tool must be grounded while in use to protect the operator from electric shock.

6

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

C

5

4

3

2

1

KNOW YOUR SCROLL SAW

A

B

L

M

K

J

D

E

F

G

H

I

A - Blade Tension Knob

T

B - Arm Housing
C - Rubber Bearing Covers

N

D - Table
E - Sawdust Blower
F - Storage Area

O

G - Base
H - Bevel Scale and Pointer
I - Table/Bevel Lock Knob
J - Lower Blade Holder
K - Blade Guard Foot
L - Blade Guard Root Lock Knob

P

S

M - LED Light
N - Upper Blade Holder
O - Table Insert

Q

R

P- Sawdust Collection Port
Q - ON/OFF Switch
R - Speed Control Knob
S - Table Adjusting Screw
T- Pinless Blade Holder

7