How to flatten your epoxy table slab
Now that your epoxy has cured, we need to flatten the slab as pouring the epoxy can be quite messy and uneven. The links are affiliate links so I do receive compensation if you purchase from that link. Any amount of help helps a small business like mine!
Router Sled
A router sled is a useful tool for flattening large, uneven wood surfaces, and it works by using a router with a straight bit to move across the surface of the wood while it is supported by a sled. There are many kinds of router sleds, including ones that you can build and others that can be purchased. If on a budget, building a router sled is a good option. There are many YouTube videos on the process. If you have some extra cash, I really suggest purchasing a router sled. This will still give you a good result but save money on CNC rentals.
To use a router sled, first, you need to set up two parallel rails on either side of the workpiece, ensuring they are level and secure. The router is then mounted on a sled that spans across these rails, allowing it to glide smoothly over the wood. Set the depth of the router bit to remove a small amount of material at a time to prevent gouging. Begin by positioning the sled on the wood, starting at one end, and carefully move the router back and forth across the surface, making multiple passes to progressively flatten the wood. Ensure that the router remains stable and level during the process to achieve an even result.
CNC
Renting CNC time from industrial shops is an excellent option for those looking to flatten large table slabs with precision, without the expense of owning a CNC machine. Many industrial shops offer access to large-format CNC routers or mills, which are ideal for flattening live-edge or rough-cut slabs. These machines can handle the size and complexity of the job, automatically removing high spots and ensuring a smooth, even surface with minimal effort. By renting time on these machines, you can achieve professional-level results—something that's difficult to replicate with manual tools like a router sled, which requires more physical labor and attention to detail. Many CNC shops also offer specialized jigs or fixtures to hold your slab in place while the machine does the work, ensuring stability and accuracy throughout the process. This makes CNC rental an ideal choice for woodworkers or furniture makers who need to flatten large slabs for tables, countertops, or other custom projects, but don't want to invest in a full-sized machine.
Router Bit
Using the proper slab flattening bit is important. While a small bit can be used, a larger bit will greatly reduce the time needed to flatten the slab. Replaceable carbide cutters will make your router bit last even longer.
Drum Sander
A router sled or a CNC both create a rough surface on the table. While this can be sanded out with a handheld sander, renting time on an industrial drum sander will save a ton of time. Generally, they have between 80-100 grit sandpaper which will will make a good base to start finish sanding.
