Downcut router bits have a spiral (helical) flute that pushes the cut material downward into the workpiece as the bit spins, rather than pulling it up and out like a standard upcut bit does. This results in:

• A cleaner top edge. Because the flutes push down, the surface where the bit enters the material stays crisp, with very little tear-out or splintering. This is the big advantage on veneered plywood, laminates, melamine, and any face you want to look good.
• Holds the workpiece down. The downward force presses the material against the table or spoilboard, which helps with thin stock.

Recommended Uses:

• Cutting dados, grooves, or pockets where the top surface matters
• Cutting out shapes in plywood or laminate on a CNC or router table
• Inlay work and mortises where a clean top edge matters
• Thin material that might lift with an upcut bit

If you’re doing a lot of cutting in sheet goods, a compression bit is often the best of both worlds. For a single clean-topped groove or pocket, a downcut is the simple choice.