The video “How to Attach a Tabletop / Z-Clip Tabletop Fasteners” is by Inspire Woodcraft. In this guide, Jodee shares practical tips on securing a tabletop to its base using Z-clips, while considering the essential aspect of wood movement.
Understanding Wood Movement
Creating a table often involves a combination of legs, aprons, and a top. While attaching the aprons to the legs is straightforward, the real challenge comes when it’s time to secure the top to the aprons. Wood movement is a critical factor to consider. It occurs in two directions: width and length. As humidity levels fluctuate, wood expands and contracts, predominantly along the growth rings.
For example, your lumber will vary in width or narrowness throughout the year, depending on moisture content. The fewer pieces of wood you glue together, the less you have to worry about movement. However, gluing several wide boards to create a tabletop can significantly increase the potential for wood movement, along with concerns like cupping and twisting.
Introducing Z-Clips
To address these challenges, Z-clips, also known as tabletop fasteners, offer a practical solution. These fasteners allow the tabletop to expand and contract while remaining securely attached to the base. One end of the Z-clip slides into a groove cut into the apron, while the other is screwed into the tabletop itself. This design gives the tabletop the freedom to move while keeping it securely in place.
These clips are not only effective but also budget-friendly. For instance, a pack of 40 can cost around $14 online, making them an economical choice for small tables.
Preparation and Installation
The best way to install Z-clips is to cut a relief groove into the aprons before assembly. For repeatability, create a setup block and label it for future use. Here’s a quick guide to get started:
- Press the Z-clip down on a flat surface and mark its position on a scrap piece of wood.
- Adjust the height of your table saw blade based on these marks to create a groove.
- Run your aprons through the blade, ensuring the correct orientation is maintained.
Attaching the Top
Once the aprons are prepared, it’s time to attach the top. For a small table, clamp the top to the base, ensuring the reveal is even on all sides. Then, flip it upside down for easier access. Insert the Z-clips into the slots, pre-drill pilot holes using a self-centering drill bit, and apply a bit of wax on the screw threads for smoother installation.
When it comes to the number of clips to use, a good rule of thumb is to space them 8 to 12 inches apart. It’s also advisable to install clips on all four sides. The clips on the sides will allow for expansion and contraction, while the clips on the ends will prevent lifting and cupping.
Conclusion
By using Z-clips, woodworkers can effectively secure tabletops while accommodating the natural movement of wood. This method not only enhances the durability of the table but also simplifies the installation process.