Sandpaper, as well as sanding blocks and detailing sponges, are essential for all CNC projects. They let us remove flaws, smooth surfaces and prepare materials for finishing with a variety of coatings. For many projects though, especially the small ones, they can be too big and bulky and can indiscriminately remove small, often fragile, details, as well as changing shaped edges away from what we so carefully designed.
So, for newcomers to CNC work, I thought I’d add this short post to quickly mention my experiences with spring-loaded detail/finger sanders. Mine is shown in the photo above and it’s simply a plastic finger with a continuous band of replaceable sandpaper around the outside. They come in many sizes, the one here being 20mm wide, although 10mm and 30mm ones are common. They also cost just a few pounds: try searching for something like ‘finger sander spring loaded’ on eBay or Amazon to see what I mean.
One of the most exciting things about finger sanders is the variety of sanding points. To start with there’s a long flat zone at the bottom, allowing sanding of large areas and straightening of cut edges. There’s also a narrow area at the front which allows for getting the sandpaper into tight places and around curves. Plus the rest of it has compound curves that can be very useful too. And when the paper starts to get worn where you need it, just push the pointy front end inward to slacken the sandpaper so you can rotate it around the edge. Personally I find them very useful as you can see in my photo of a Darth Vader routing project below.