Transforming your cabinetry with high-quality drawer slides can significantly enhance both functionality and aesthetics. While some installation guides can be less than straightforward, mastering the process for premium hardware like Blum Tandem plus Blumotion systems is incredibly rewarding. These renowned full-extension, soft-close drawer slides, once properly understood, offer a smoother and often simpler installation experience compared to traditional side-mounted alternatives. This comprehensive guide will demystify the process, from selecting the right components to precise drawer construction, ensuring your drawer building project is a success.
Why Choose Blum Tandem Plus Blumotion Drawer Slides?
Blum is a name synonymous with innovation and quality in the world of cabinet hardware, and their Tandem plus Blumotion drawer slides are a prime example. These slides offer a superior user experience, making them a popular choice for both professional cabinetmakers and serious DIY enthusiasts. Here’s why they stand out:
- Smooth, Effortless Operation: The Tandem runner technology ensures exceptionally smooth gliding, even under heavy loads. Experience consistent, reliable movement with every opening and closing.
- Integrated Soft-Close (Blumotion): Say goodbye to slamming drawers. The Blumotion mechanism gently and silently closes drawers, protecting contents and preserving the life of your cabinetry. This feature is a hallmark of modern, high-end kitchens.
- Full Extension: Access every inch of your drawer space. Full extension slides bring the entire drawer box out of the cabinet, making it easy to see and retrieve items at the very back. No more rummaging for lost items!
- Durability and Reliability: Engineered for longevity, Blum slides are built to withstand years of heavy use, ensuring your drawers perform flawlessly for decades. Their robust construction guarantees peace of mind.
- Hidden Hardware: Unlike traditional side-mount slides, Tandem runners are concealed beneath the drawer box. This provides a clean, minimalist aesthetic that elevates the visual appeal of your custom cabinetry, offering a sleek and professional finish.
While the initial learning curve for their specific sizing and installation instructions might seem daunting, the long-term benefits in terms of functionality, durability, and visual appeal make Blum Tandem plus Blumotion an investment well worth making for any quality-focused project.
Selecting the Right Blum Tandem Drawer Slides
Choosing the correct drawer slides is the first critical step towards a successful project. I consistently recommend Blum Tandem plus Blumotion series, specifically the 563H or 569H models, for their robust performance and integrated soft-close feature. These are full extension slides, meaning your drawers will open completely, providing full access to their contents.
Understanding Model Numbers: 563H vs. 569H
Blum offers different models to accommodate various load requirements:
- 563H Series: These slides are designed for standard-duty drawers with a load capacity of up to 100 lbs (approximately 45 kg). They are perfectly suitable for most kitchen, bathroom, and bedroom drawers, providing reliable performance for everyday items.
- 569H Series: For heavy-duty applications, such as large pantry pull-outs, wide kitchen drawers storing heavy cookware, or filing cabinets holding numerous documents, the 569H series offers an impressive load capacity of 150 lbs (approximately 68 kg). Always opt for the 569H when you anticipate heavier contents or frequent use in demanding environments to ensure long-lasting durability.
Crucial Detail: ‘H’ vs. ‘F’ Designation
One of the most common pitfalls for first-time users is misunderstanding the material thickness designation. Always ensure you purchase the correct series for your drawer box material to guarantee proper fit and function:
- The ‘H’ series (563H/569H) is specifically engineered for drawer sides constructed from 1/2 inch to 5/8 inch thick material. This is a very common choice for many woodworking projects, especially when using prefinished plywood, which typically comes in 1/2-inch thickness.
- The ‘F’ series (563F/569F) is designed for drawer sides made from 3/4 inch thick material. Accidentally purchasing ‘F’ series slides for 1/2″ or 5/8″ material will lead to an improper fit, causing the drawer to bind or have excessive play. Double-check this critical detail before making your purchase to avoid delays and frustration!
Choosing the Correct Length
Blum Tandem slides come in various lengths to match your cabinet depth. To determine the appropriate slide length, measure the inside depth of your cabinet opening from the front edge (where the drawer front will sit) to the back panel. Most manufacturers recommend selecting a slide length that is either equal to or slightly shorter than this measurement, ensuring adequate clearance at the back of the cabinet for proper installation and operation. Common lengths range from 12 inches to 27 inches, allowing flexibility for diverse cabinet designs.
Essential Blum Locking Devices
Beyond the drawer runners themselves, you will need a set of locking devices for each drawer. These mechanisms are vital; they securely attach the drawer box to the runners, allow for easy removal of the drawer, and provide crucial adjustability for achieving perfect alignment of your drawer fronts. You always need one right and one left locking mechanism per drawer, so ensure you order them in pairs or individually for both sides.
The array of locking device options can initially seem overwhelming, but understanding their core functions and adjustment capabilities will simplify your choice. Blum offers devices with varying levels of adjustability, designed to meet different project needs:
- T51.0801 20 (Vertical Mount for Narrow Drawers): This device is particularly useful for narrow drawer applications and primarily offers precise height adjustment. Its vertical mount design allows screws to be driven into the edge of the drawer sub-front, which can be advantageous in tight spaces.
- T51.1801 (Standard): A widely used and reliable option, providing robust height adjustment. This is often the go-to choice for many standard drawer applications where basic vertical alignment is sufficient.
- T51.1801 20 (Vertical Mount): Similar to the T51.1801 but featuring the vertical mount design, offering the same strong height adjustment capabilities with alternative screw placement.
- T51.1901 (Standard): A more versatile option, this device offers both height and side-to-side adjustments. This dual adjustability is invaluable for achieving precise alignment of the drawer front relative to adjacent doors or other drawer fronts.
- T51.1901 20 (Vertical Mount): The vertical mount version of the T51.1901, providing both height and side-to-side adjustments with the added benefit of edge-mounting.
- T51.1901 PS (Standard, with Push/Pull Adjustment): This is the most feature-rich option, offering comprehensive height, side-to-side, AND depth adjustments. The ‘PS’ (Push/Pull) functionality is particularly useful for achieving a perfectly flush drawer front, especially important for inset doors or when aligning multiple drawer fronts in a seamless panel.
When considering vertical mount options, be mindful of your drawer box material. If you’re constructing drawers from prefinished plywood, as I often do, repeatedly driving screws into the thinner edge of the plywood can sometimes lead to splitting or delamination over time. In such cases, the standard, angled-screw locking devices might be a safer and more reliable choice, distributing the load over a wider surface.
Precision Drawer Sizing for Blum Tandem Slides
Accurate drawer sizing is paramount for the smooth, bind-free operation of Blum Tandem slides. Even slight deviations in your measurements can lead to issues with friction, gaps, or difficulties in installation. The key is to work backward from your cabinet opening measurements, carefully calculating each dimension.
Step 1: Measure Your Cabinet Opening
Begin by precisely measuring the interior width of your cabinet opening. It is crucial to take several measurements at different points (e.g., top, middle, and bottom) across the width and use the smallest measurement. This ensures that your drawer will fit into the tightest point, preventing binding. Also measure the depth to determine the maximum slide length.
Step 2: Calculate Drawer Box Width
Blum’s precision engineering requires specific clearances for the slides to operate correctly. A common and easy interpretation of Blum’s technical diagrams for typical drawer materials is as follows:
- If you are using 1/2 inch plywood for your drawer sides (which is a very common choice for cost-effective and lightweight drawer boxes), you should subtract 5/8 inch (0.625 inches) from your measured cabinet opening width. This result will give you the exact outside width of your assembled drawer box.
For example, if your cabinet opening measures 15 inches wide, and you’re constructing your drawer box with 1/2″ plywood, your calculation would be: 15″ (cabinet opening) – 5/8″ (Blum clearance) = 14 3/8″ (outer width of drawer box).
It is always crucial to cross-reference these calculations with the official Blum technical documentation for your specific slide model, especially if you plan to use material thicknesses other than 1/2″. Different slide series or material thicknesses may have slightly different subtraction values.
Step 3: Determine Front and Back Panel Width
When constructing your drawer box, the side panels typically extend the full length of the drawer. The front and back panels are then installed *between* these side panels. For constructions utilizing 1/2 inch plywood for the sides, calculating the necessary width for your drawer front and back panels is quite simple:
- Subtract 1 inch from the outer width of your drawer box (which you calculated in Step 2). This calculation accounts for the combined thickness of both 1/2 inch side panels (1/2″ + 1/2″ = 1″).
For example, if your drawer box’s outer width (calculated in Step 2) is 14 3/8 inches, then your front and back panels should be cut to: 14 3/8″ (outer drawer box width) – 1″ (thickness of two side panels) = 13 3/8″ (width of front and back panels).
This method ensures a consistent and strong drawer box structure, perfectly dimensioned for Blum Tandem slides.
Preparing Your Drawer Box: Notching and Boring for Blum Slides
Once your drawer box components are cut to size, the next critical step is to prepare the back panel for the Blum runners and their corresponding locking mechanisms. This involves creating a specific notch and bore (hole) on both sides of the back panel. Performing these operations *before* assembly is significantly easier, safer, and more accurate than attempting them on an assembled box.
IMPORTANT: These measurements are specifically tailored for the 563H/563 and 569H/569 drawer runners. Always double-check Blum’s official documentation for any minor variations if you are using a different model or an older series.
- The Bore (Hole): This precisely drilled hole accommodates the hook feature of the locking device, which secures the drawer box to the slide.
- Diameter: The bore should be precisely 1/4 inch in diameter. Using an accurate drill bit is essential.
- Depth: It needs to be 1/4 inch deep. When working with 1/2 inch thick drawer material, it’s common for DIYers to accidentally drill slightly through the material. While not ideal, it’s often barely noticeable from the outside and typically doesn’t compromise the function or integrity of the drawer. For best results and consistent depth, use a drill press with a depth stop or a depth collar on your handheld drill bit.
- The Notch (Cutout): This rectangular cutout provides essential clearance for the end of the drawer runner itself, ensuring it seats properly against the back of the drawer.
- Height: The notch needs to be exactly 1/2 inch tall.
- Width: It should be a minimum of 1 3/8 inch wide. Ensure this width to prevent any interference with the slide mechanism.
You can cut this notch accurately using a jigsaw. Mark your lines clearly with a pencil and a straightedge or combination square before cutting. Precision here contributes directly to the smooth operation and proper seating of your drawer, making final adjustments much simpler.
For those who frequently build multiple drawers, investing in or creating a dedicated jig for the Blum hole drilling and notching is highly recommended. As detailed in my tutorial for the Blum hole drilling jig, such a jig ensures consistent and accurate placement without the need for repetitive measuring on every single drawer back. This significantly speeds up the process, minimizes errors, and guarantees professional results across all your projects.
Constructing Your Drawer Box
With your components precisely cut and the back panel prepped with the necessary notches and bores, it’s time for assembly. The goal is to construct a strong, perfectly square, and rigid drawer box. You have several excellent options for joining the front and back panels to the drawer sides, each with its own advantages:
- Floating Tenons: This method creates exceptionally strong joints by using separate tenons (often made of hardwood or engineered wood) fitted into mortises cut into both mating pieces. It offers excellent strength, superior longevity, and a clean, high-end appearance.
- Dowels: Similar to floating tenons, dowels use cylindrical pins inserted into corresponding holes to align and strengthen the joint. They require accurate drilling but create very durable connections that are excellent for both strength and appearance.
- Locking Rabbet Joint: As highlighted in my Locking Rabbet Drawer Joint tutorial, this method provides a strong mechanical lock and ample gluing surface, making for a very robust drawer box. It’s often favored for its inherent strength and relatively straightforward execution with a router table or table saw.
- Pocket Screws: A highly popular choice for its speed and ease of use, especially for DIYers equipped with a pocket hole jig. While quick and efficient, it’s crucial to follow specific guidelines regarding screw placement.
Using Pocket Screws: A Critical Warning
If you opt for pocket screws as your joining method, you must be extremely cautious about their placement. DO NOT drill a pocket hole on or too near the groove intended for the drawer bottom. This groove is typically routed into the bottom interior edge of your drawer box components. Driving a screw into or through this groove will inevitably obstruct the drawer bottom from sliding into place, requiring frustrating disassembly and repair. Always position pocket holes strategically in areas that will not interfere with the drawer bottom, typically higher up on the side panels or towards the center of the front and back panels.
Regardless of your chosen joinery method, ensure your drawer box is perfectly square during assembly. Use reliable clamps and a woodworking square or speed square to hold everything firmly in place while the glue sets or while driving screws. A perfectly square drawer box is absolutely essential for the smooth, binding-free operation of your Blum slides and for achieving perfectly parallel reveals.
Installing the Drawer Bottom
Most drawer bottoms are made from 1/4 inch or 1/2 inch plywood or MDF and sit in a groove routed into the bottom interior edge of the drawer box components. Slide the bottom panel into place after assembling the front, back, and two side panels, but typically before permanently securing the last side or back piece (depending on your specific assembly method). Ensure it fits snugly but isn’t forced, allowing for potential seasonal wood movement if you’re using solid wood for the bottom panel.
Final Installation and Adjustment
Once your drawer boxes are meticulously built and perfectly prepared, the final exciting step is to install them into your cabinetry. This phase is where all your initial precision in sizing and preparation truly pays off. While the process itself is remarkably straightforward with Blum hardware, a few key practices will ensure flawless results and a professional finish:
- Mounting the Cabinet Runners: Use a specialized installation jig, a carefully crafted spacer block, or precise measurements to ensure the cabinet-mounted runners are perfectly level, parallel, and at the correct height within the cabinet opening. This meticulous initial setup is crucial for smooth drawer operation and consistent reveals.
- Attaching the Drawer Box: Align the locking devices on your prepared drawer box with the corresponding pins on the cabinet runners. Gently push the drawer in until you hear and feel it click securely into place. The positive engagement indicates a firm connection.
- Fine-Tuning Adjustments: This is where the magic of Blum’s adjustability comes in. Utilize the adjustment features of your chosen locking devices (height, side-to-side, and depth – depending on the model you selected) to achieve perfectly even reveals around your drawer fronts. Ensure the drawer glides smoothly without any binding or excessive play. Take your time with these final adjustments for a truly professional and aesthetically pleasing outcome.
For a detailed, step-by-step walkthrough of the physical installation process and valuable tips for fine-tuning, be sure to consult my comprehensive tutorial on installing drawers with Blum Tandem plus Blumotion drawer slides. That guide will provide visual aids and practical advice for securely attaching the slides to your cabinet and drawer box, ensuring effortless operation.
Conclusion: Master Your Drawer Projects with Blum
Embarking on a drawer building project with Blum Tandem plus Blumotion slides might initially seem complex due to their precision requirements, but the result is undeniably worth the effort. By thoroughly understanding the specifications for selecting the right slides and locking devices, mastering the exact sizing formulas, and meticulously preparing and constructing your drawer boxes, you are setting yourself up for success and transforming your cabinetry.
Blum hardware offers unparalleled quality, delivering smooth, silent, and reliable drawer operation that elevates any cabinetry from functional to exceptional. With the detailed guidance provided here and a methodical, step-by-step approach, you can confidently build and install drawers that not only look professionally crafted but also provide years of exceptional performance and user satisfaction. Happy woodworking!