Wen JN8504 8.5-Amp Biscuit Joiner Review


Explore the capabilities of the Wen JN8504 8.5-Amp Biscuit Joiner in our comprehensive review. This tool stands out for woodworking enthusiasts seeking to create precise, strong wood joints for various projects like furniture making or shelf building. Learn about its design, functionality, and how it fits into your woodworking toolkit.

Technical Specs

  • Motor: 8.5 Amps
  • Blade: 4-inch carbide-tipped blade
  • Speed: 10,000 RPM
  • Biscuit Capacity: Pres-set stops for standard #0, #10, and #20 biscuits Manually adjustable for other sizes
  • Fence: Adjustable from 0 to 90 degrees with variable height settings
  • Dust Collection: Detachable dust bag

Features of the Wen JN8504

Power and Performance

Person using a handheld biscuit joiners

Central to the JN8504’s capabilities is its 8.5-Amp motor, a feature that enables it to tackle a variety of woodworking tasks with relative ease. This motor capacity ensures that the tool can perform consistently across different wood types, including moderately hard woods like cherry. The joiner’s ability to cut clean, precise slots for biscuit insertion without causing burn marks on the wood underscores its adequacy for most home woodworking projects. This power, coupled with the tool’s straightforward operation, positions the JN8504 as a reliable tool for quick and efficient joinery tasks, aligning panels and boards with minimal fuss.

Precision and Adjustability

Hand adjusting knob on power tool.

A significant advantage of the Wen JN8504 is its precision and adjustability, critical for achieving accurate and consistent joinery. The adjustable fence and depth settings empower users to tailor the joiner to the specific requirements of each project. This flexibility is particularly beneficial for working with various biscuit sizes (0, 10, 20), as the tool features a dial to adjust the plunge depth according to the biscuit size being used. However, users should note that calibration can be slightly challenging, requiring careful adjustment to ensure optimal alignment and precision. Despite these hurdles, once set up, the joiner offers a dependable means to achieve uniform slots, contributing significantly to the overall quality and integrity of the joinery work.

Design and Durability

Person using a woodworking tool with an instruction manual open

The Wen JN8504’s design reflects a balance between cost-efficiency and durability. While some components are made of plastic and cast aluminum, these choices seem to be a deliberate compromise to keep the tool affordable without significantly compromising its functionality for occasional use. The presence of plastic does not detract from the tool’s core performance, and the cast aluminum parts, while not as robust as those in higher-end models, are adequate for the joiner’s intended use spectrum. The tool’s overall build is deemed ‘pretty good’ for its price range, with minor caveats such as the handle’s slight give, which does not critically affect operation. The design also incorporates thoughtful features like effective dust collection, which, despite the dust bag’s limited capacity, suggests potential for excellent performance when connected to a dust extraction system.

Performance of Wen JN8504 8.5-Amp Biscuit Joiner

The Wen JN8504 8.5-Amp Biscuit Joiner stands out for its proficient performance across a wide range of woodworking tasks, solidifying its place as an attractive option for hobbyists and DIY enthusiasts. Its robust 8.5-Amp motor is well-equipped to manage various wood types, even moderately hard ones like cherry, ensuring smooth and efficient operation. The joiner’s standout feature is its capacity to produce clean, accurate slots for biscuits without causing any burn marks on the wood. This level of precision is essential for tight-fitting joints that enhance both the strength and alignment of the pieces being joined, a result of the seamless integration of the motor’s power and the blade’s quality.

Person cutting a wooden plank with a power tool on a workbench.

Despite its commendable performance, the JN8504 is not without its drawbacks. The placement of the alignment mechanism at the tool’s base can complicate matching the joiner with top-placed alignment marks, potentially necessitating workarounds by the user. Additionally, the tool’s construction includes some plastic parts, and the handle exhibits a minor degree of flexibility, which might raise concerns regarding its durability under intensive, long-term use. However, these issues are relatively minor when considering the tool’s overall effectiveness for occasional use, especially when factored in with its adjustable fence and depth settings that allow for significant customization to suit various project requirements.

Common Issue of Wen JN8504 8.5-Amp Biscuit Joiner

  1. Alignment Challenges: Some users have reported difficulties in aligning the joiner accurately with their workpieces, particularly because the alignment mechanism is located on the bottom of the plate. This can make it challenging to match the joiner with marks made on the top of the workpiece, potentially affecting the precision of the joints.
  2. Durability Concerns with Plastic Components: The presence of plastic parts in the joiner’s construction, notably in areas subjected to frequent stress or pressure, can raise durability concerns. Over time and with heavy use, these plastic components may wear out or break, necessitating repairs or replacements.
  3. Adjustment and Calibration Issues: Adjusting the fence and depth settings for various biscuit sizes and project requirements can sometimes be less intuitive than desired. Calibration, in particular, can be a bit cumbersome, with users noting that the process can be slightly complex and the scale not always lining up clearly or accurately.
  4. Dust Bag Capacity: While the joiner’s dust collection system is generally effective, the small capacity of the included dust bag can be a limitation. It may fill up quickly, requiring frequent emptying, which can interrupt the workflow. Users looking for a more continuous operation might need to connect the joiner to an external dust extraction system.
  5. Fence Stability: There have been some mentions of the fence having a bit of give or not being completely stable, which could affect the consistency of the biscuit slots if not addressed.

Table Comparison

FeatureWen JN8504 8.5-Amp Biscuit JoinerDeWalt DW682K Plate Joiner
Motor Power8.5 Amps6.5 Amps
Precision & AdjustabilityAdjustable fence and depth for various biscuit sizesInnovative fence system for precise adjustments
Design & DurabilityMix of plastic and cast aluminum; designed for occasional useRugged design, built for durability and heavy use
Ease of UseUser-friendly with a straightforward adjustment mechanismKnown for precision and ease of alignment
Dust CollectionEffective, but limited by small bag capacitySuperior dust collection system
Price PointMore affordable, great for hobbyistsHigher, reflecting professional-grade quality
Best Suited ForHobbyists and DIY enthusiasts for occasional projectsProfessionals and frequent users requiring durability and precision


The Wen JN8504 stands out for its affordability and satisfactory performance, making it a great choice for hobbyists and DIY enthusiasts who engage in occasional woodworking projects. Its 8.5-Amp motor ensures it can handle a variety of wood types efficiently, while the adjustable settings provide the flexibility needed for different tasks.

The DeWalt DW682K, on the other hand, is tailored for more frequent and demanding use, with a focus on precision and durability. Its 6.5-Amp motor is complemented by a robust design and advanced adjustability features, making it a preferred option for professionals seeking reliability and exactness in their joinery work.

Pros and Cons of Wen JN8504


  • Powerful motor ensures efficient and precise cuts.
  • Adjustable fence and depth settings provide versatility for various joint types.
  • Dust collection system enhances cleanliness and visibility.
  • Ergonomic design ensures comfortable use over extended periods.


  • Some users may find the tool heavy for prolonged use.
  • Plastic components in the design may raise durability concerns over long-term use.

Maintenance Tips

Regular Cleaning

  • After Use: Always clean the joiner after each use. Use a brush or compressed air to remove sawdust and debris from the blade and cutting area.
  • Vents and Motor Housing: Keep the air vents and motor housing clear of dust to prevent overheating and to maintain proper ventilation.

Blade Care

  • Inspection: Regularly inspect the blade for wear or damage. A dull blade can affect the quality of your cuts and put unnecessary strain on the motor.
  • Cleaning: Clean the blade with a resin remover or mild solvent to keep it free from build-up, which can impact its cutting efficiency.
  • Replacement: Replace the blade if it’s damaged or too dull. Always use the correct blade size and type recommended by Wen.

Adjustments and Alignments

  • Check Adjustments: Periodically check the fence and depth adjustments to ensure they are accurate and functioning correctly. Misalignments can lead to inaccurate cuts.
  • Calibration: If the joiner’s cuts are off, recalibrate the fence and depth settings according to the user manual’s instructions.

Dust Collection

  • Dust Bag: Regularly empty the dust collection bag to prevent it from overfilling, which can reduce its effectiveness and potentially clog the dust extraction system.
  • Dust Port: Clean the dust port periodically to ensure it remains clear for optimal dust extraction.

Motor and Brushes

  • Brush Inspection: The JN8504 uses a brushed motor, so check the brushes for wear over time. Worn brushes can lead to decreased motor performance and should be replaced as needed.
  • Brush Replacement: Refer to the user manual for instructions on how to access and replace the motor brushes. This is typically a straightforward process, but it’s crucial to use the correct replacement parts.


The Wen JN8504 8.5-Amp Biscuit Joiner is a standout tool for woodworkers at all levels, offering a powerful 8.5-Amp motor that delivers precision and versatility in joinery tasks. Its ease of use and adjustable features make it accessible for beginners while still meeting the needs of experienced users. With a design focused on durability and performance, the JN8504 is built to last and comes at a great value, making it a wise investment for anyone looking to enhance their woodworking projects. This tool is truly a dependable partner for a wide range of woodworking applications, from intricate furniture making to simple home projects, providing strength and quality to your work.


  1. What types of projects is the Wen JN8504 best suited for?
    The Wen JN8504 is versatile enough for a range of woodworking projects, including but not limited to furniture making, cabinet construction, and creating strong wood joints for various crafts and home improvement tasks.
  2. Can beginners use the Wen JN8504 effectively?
    Yes, the Wen JN8504 is designed to be user-friendly, making it accessible for beginners. Its straightforward operation, combined with detailed instructions, allows novice woodworkers to achieve professional-quality joints.
  3. How do I select the correct biscuit size when using the Wen JN8504?
    The choice of biscuit size depends on the thickness and width of the wood pieces you’re joining. The Wen JN8504 manual includes a guide to help you select the appropriate biscuit size for your specific project.
  4. What maintenance does the Wen JN8504 require to keep it in optimal condition?
    Regular maintenance for the Wen JN8504 includes cleaning the tool after use, ensuring the blade is sharp and in good condition, and storing the joiner in a dry, safe place. Periodically checking for loose components and ensuring proper calibration are also recommended.
  5. How does the Wen JN8504 compare to other biscuit joiners in terms of precision and reliability? The Wen JN8504 is highly regarded for its precision and reliability, thanks to its powerful motor, adjustable settings, and robust construction. It consistently ranks well in comparisons with other biscuit joiners, offering a balance of quality and value.
  6. Where can I find replacement blades or parts for the Wen JN8504?
    Replacement blades and parts for the Wen JN8504 can be found through Wen’s official website, authorized dealers, and select online retailers that specialize in woodworking tools and accessories.
  7. Is it possible to adjust the cutting depth on the Wen JN8504?
    Yes, the Wen JN8504 allows for adjustable cutting depths, enabling you to customize the depth of your biscuit slots based on the specific requirements of your project.
  8. Can the Wen JN8504 be used on materials other than wood?
    The Wen JN8504 is specifically designed for woodworking projects and is optimized for use on various types of wood. Using it on non-wood materials is not recommended and could damage the tool or the material.

For more expert woodworking and advice, explore our guides, discover top recommendations in our best section, and delve into in-depth product reviews in our review section. Happy Cutting.

Joel Cunningham
Joel Cunningham
Forestry Author

I'm Joel Cunningham, an expert in pruning and weed management with over a decade of experience. My skills are rooted in formal training and extensive practice, focusing on advanced pruning techniques and efficient weed control. I'm known for my quality work, precision, and deep understanding of plant health and soil dynamics. My contributions extend to educational initiatives where I share sustainable practices and advice, establishing myself as a reliable and authoritative figure in the gardening community.


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