Build a Narrow Sanding Block for Rabbets and Edges
A standard sanding block works well on wide, flat surfaces. But when you're sanding a narrow rabbet or the edge of a workpiece, a large block can be difficult to control. If it tips to one side, you can accidentally round over an edge that should remain crisp and square.
This DIY narrow sanding block solves that problem with a slim, flat sanding surface that fits into tight spaces. It uses narrow strips of sandpaper held in place by a pair of wooden wedges, making it easy to replace the abrasive when it wears out.
A Better Sanding Block for Narrow Rabbets
The key to this design is its narrow sanding surface. Unlike a conventional sanding block, this shop-made edge sander is sized to hold commonly available 1"-wide strips of sandpaper.
The narrow profile makes it easier to sand rabbets and other confined areas while keeping the abrasive flat against the surface.
Instead of wrapping the sandpaper around the ends of the block, two wedge-shaped slots cut into the top hold the abrasive securely. Small wooden wedges press the ends of the sandpaper into the slots.
This creates a simple, adjustable system that makes changing sandpaper quick and easy.
Make the Sanding Block
Start with an oversize wood blank. Before cutting it to its final dimensions, run the blank through the jointer to ensure the bottom sanding surface is perfectly flat.
This is an important step because the block needs to maintain a flat surface to avoid rounding over the edges of a rabbet.
Once the blank is prepared, cut the block to length and round over the upper corners at the front and back for a more comfortable shape.
Next, use a band saw to cut two wedge-shaped slots into the top edge. These slots will hold the ends of the sandpaper.
Cut the Sandpaper-Holding Wedges
The two small wedges are what make this sanding block work.
Each wedge fits into one of the slots on top of the block, pressing the sandpaper into place.
Because these are small parts, start with an oversize blank when cutting them. This makes the pieces easier to control and keeps your fingers farther from the blade.
Cut the wedges to the same width as the sanding block, or slightly narrower, so they fit neatly into the slots.
Add a Handle and Sandpaper
For better control, attach a simple screen door handle to the top of the sanding block.
The handle provides a comfortable grip and makes it easier to keep the sanding surface flat as you work.
To install the sandpaper, lay a 1"-wide strip along the bottom of the block, wrap the ends up into the slots, and press the wooden wedges into place.
Pull the sandpaper snug before fully seating the wedges.
Now the block is ready to smooth narrow rabbets, edges, and other areas where a standard sanding block is too wide.
A Handy Addition to Your Sanding Tools
Sometimes the simplest shop-made tools solve the most frustrating woodworking problems.
This narrow sanding block provides better control when working in confined areas, while the wedge-locking system makes replacing sandpaper straightforward.
It's easy to build from scraps, uses commonly available sandpaper, and helps keep sharp edges crisp during sanding.
Choosing the Right Sandpaper
The right sandpaper makes a big difference in how quickly and effectively you can smooth a workpiece. Learn about abrasive types, grit selection, and choosing sandpaper for different woodworking tasks.
Whether you're smoothing a narrow rabbet or preparing a project for finishing, these tips will help you get better results.
EXPLORE SANDPAPER OPTIONS → Get Better Results from Your Sanding
