Which cutting tools can be used as “bottom cleaning knives”?

Five Bottom Cleaning Knife Tools

Bottom cleaning knife tools include spoilboard surfacing cutters, bottom-cleaning router bits, straight cutters, flat end mills, and fly cutters. Each can produce a level surface when the tool geometry, machine, material, and toolpath are compatible. Large-diameter surfacing tools cover wide areas quickly, while smaller bits and end mills reach compact pockets and tighter corners.

Spoilboard cutters suit CNC table resurfacing and broad recesses. Bottom-cleaning bits combine bottom and side edges for pockets, while straight cutters handle lighter work. Flat end mills are useful in rigid CNC systems and tougher materials; fly cutters require suitable machines and careful balancing. Compare diameter, shank or arbor size, edge count, carbide grade, speed rating, chip clearance, and required floor finish. Check runout, overlap, depth per pass, workholding, guarding, and dust extraction. A reliable cutting tool supplier can recommend the safest option. Established milling cutter practices improve flatness, productivity, and tool life.