Wen LA4275 - User Manual

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INSTRUCTION MANUAL

EXPLODED VIEW & PARTS LIST

MODEL LA4275

No. Part No. Description Qty.

1 LA4275-001

Back Plate Screw,

Phillips-Head, M3x6

2 LA4275-002 Back Plate 1

3 LA4275-003 Pinion Screw 2

4 LA4275-004 Pinion 2

5 LA4275-005 Jaw Carriage 1 1

6 LA4275-006 Jaw 1 1

7 LA4275-007

Jaw-Mounting Screw,

Hex-Head, M4x8

8 LA4275-008 Chuck Body Assembly 1

9 LA4275-009 Jaw Carriage 4 1

No. Part No. Description Qty.

10 LA4275-010 Jaw 4 1

11 LA4275-011 Stop Screw, M4-0.7x8 1

12 LA4275-012

Screw Chuck,

M8-3.0x20

13 LA4275-013 Jaw 3 1

14 LA4275-014 Jaw Carriage 3 1

15 LA4275-015 Jaw 2 1

16 LA4275-016 Jaw Carriage 2 1

17 LA4275-017 Chuck Key 1

18 LA4275-018

Hex Wrench,

T-Handle, 3mm

HAVE PRODUCT QUESTIONS? NEED TECHNICAL SUPPORT? Please feel free to contact us:

TECHSUPPORT@WENPRODUCTS.COM1-800-232-1195 (M-F 8AM-5PM CST)

This item has a 2-year warranty - for the full warranty statement, please visit wenproducts.com.

Replacement jaws and the most up-to-date instruction manuals can be found on wenproducts.com.

Your chuck is designed to aid in holding wooden

workpieces on your lathe, and is capable of gripping

on both the outside and inside of various workpieces.

EXTERNAL GRIP VS INTERNAL GRIP

The external grip is applied on the exterior of the

workpiece, while the internal grip is applied on the

interior of the workpiece. See Figures 1 & 2.

DOVETAIL JAWS

Your chuck has dovetailed jaws that are suitable for

gripping a recess or tenon prepared in your work-

piece for clamping. Ensure that the recess or tenon

prepared has a flat base so that it can rest flush

against the flat surface of the chuck jaws. For the di-

mensions of your chuck’s dovetailed jaws, see Fig. 3.

Pre-Assembled

2.75-INCH 4-JAW

SELF-CENTERING LATHE CHUCK

Compatible with all WEN Wood Lathes

SPECIFICATIONS

Mounting Thread 1"-8

Screw Chuck Thread M8-3.0x20

Jaw Type Dovetail

External Grip Range (Fig. 1) 1-1/8" to 1-3/4"

Internal Grip Range (Fig. 2) 1-1/2" to 2-1/8"

Self-Centering Yes

Fig. 1 External Grip

Packing List

1) Chuck ......................1

2) Screw Chuck ............ 1

3) Chuck Key ................ 1

4) Hex Wrench .............1

Internal Grip Fig. 2

Visit wenproducts.com and search the phrase

"wood lathe" to purchase live centers and other

lathe accessories.

V. 2019.09.26

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Do you have a question about the Wen LA4275 and is the answer not in the manual?

Summary

OPERATION

REMOVING THE GREASE

Instructions for removing grease from the chuck before use, emphasizing clean operation.

USING A LIVE CENTER

Guidance on using a live center with the chuck for specific lathe operations.

MOUNTING THE CHUCK ON YOUR LATHE

Detailed steps for securely mounting the chuck onto a wood lathe spindle.

OPENING;CLOSING THE JAWS

Procedure for opening and closing the chuck jaws using the provided key.

MOUNTING THE SCREW CHUCK

Instructions for attaching the screw chuck accessory to the main chuck body.

MAINTENANCE

CLEANING & LUBRICATION

Guidance on cleaning the chuck after use and proper lubrication for longevity.

DISPOSAL

Information regarding the proper disposal of the product and its components.

The WEN LA4275 is a 2.75-inch 4-jaw self-centering lathe chuck designed to securely hold wooden workpieces on a lathe. It is compatible with all WEN wood lathes and any other wood lathe with a 1-inch diameter, 8 threads per inch (1"-8) headstock spindle.

Function Description:

The primary function of the LA4275 chuck is to provide a reliable gripping mechanism for various wooden workpieces, allowing for both external and internal gripping. Its self-centering design ensures that the workpiece is automatically centered when clamped, simplifying setup and improving turning accuracy. The chuck is equipped with dovetailed jaws, specifically designed to grip recesses or tenons prepared in the workpiece. This allows for secure clamping of bowls, platters, and other items that require a strong, concentric hold. The chuck also includes a screw chuck attachment, which is particularly useful for mounting larger workpieces by screwing them directly onto the chuck.

Important Technical Specifications:

Chuck Size: 2.75 inches
Jaw Type: Dovetail
Number of Jaws: 4
Self-Centering: Yes
Mounting Thread: 1"-8 (compatible with 1-inch diameter, 8 threads per inch headstock spindles)
Screw Chuck Thread: M8-3.0x20
External Grip Range (Fig. 1): 1-1/8" to 1-3/4"
Internal Grip Range (Fig. 2): 1-1/2" to 2-1/8"
Screw Chuck Pilot Hole Requirement: Approximately 31mm (1-7/32") deep, drilled with a 3/8" drill bit.
Jaw Dimensions (Fig. 3):
- Jaw Carriage width: 5mm
- Jaw length (overall): 19.45mm
- Jaw length (gripping surface): 17.05mm
- Dovetail angle: 5°
- Dovetail depth: 4.50mm
- Jaw height: 12mm
- Jaw width: 16mm

Usage Features:

Mounting the Chuck: The chuck threads onto the lathe's headstock spindle by turning it clockwise. The headstock handwheel (or other spindle stationary tool) should be held to prevent the spindle from rotating during mounting. The chuck key is then used to fully secure the chuck by turning it clockwise.
Opening/Closing the Jaws: The chuck jaws are opened by turning the chuck key counter-clockwise and closed by turning it clockwise. Workpieces should be placed flush against the jaw face before tightening.
External Grip: Used for gripping the exterior of a workpiece, typically a tenon. The external grip range is 1-1/8" to 1-3/4".
Internal Grip: Used for gripping the interior of a workpiece, typically a recess. The internal grip range is 1-1/2" to 2-1/8".
Dovetail Jaws: The dovetailed design ensures a strong, non-slip grip on workpieces with prepared recesses or tenons. It is crucial that the recess or tenon has a flat base to ensure flush contact with the chuck jaws.
Screw Chuck Usage: For larger workpieces, the M8-3.0x20 screw chuck can be mounted internally within the chuck jaws. A pilot hole (approx. 31mm deep with a 3/8" drill bit) is drilled into the center of the workpiece, which is then screwed onto the screw chuck. The base of the workpiece should be flush against the top of the jaws for a secure hold.
Live Center Compatibility: When turning long workpieces, a live center in the tailstock can be used to provide additional support, enhancing stability and reducing vibration.
Grease Removal: Before initial use, the protective layer of grease coating the chuck's surfaces should be removed with a dry cloth to ensure optimal performance and prevent debris accumulation.

Maintenance Features:

Cleaning: Regular cleaning is essential for extending the chuck's service life. After each use, the chuck should be wiped down with a soft cloth to remove chips, dust, and other debris. Compressed air (limited to 25 PSI) can be used to spray debris outwards from the center of the chuck. A small brush (e.g., a toothbrush) can help remove chips from hard-to-reach areas like the jaws, jaw carriages, and body.
Lubrication: Dry lubricants (PTFE works well) should be applied to the moving parts of the chuck to ensure smooth operation. Wet lubricants or grease should be avoided as they can attract dust and chips, potentially leading to decreased performance or damage.
Scroll Screw Cleaning: Occasionally, the jaws should be opened, and a wire bottle brush can be used to clean the scroll screw. The brush should be run along the screw while turning the chuck key in the keyhole.
Deep Cleaning: For intensive use, a complete tear-down and thorough cleaning of the chuck may be necessary. Detailed guides for deep cleaning are available on the wenproducts.com website.
Replacement Parts: Only identical WEN replacement parts should be used for servicing to avoid hazards or product failure. Replacement jaws and up-to-date instruction manuals are available on wenproducts.com.
Warranty: The LA4275 chuck comes with a 2-year warranty.
Disposal: At the end of its lifespan, the product's components should be recycled responsibly according to local regulations to minimize environmental impact. Packaging should also be recycled where facilities exist.