Straight Knife vs Bottom Cleaning Knife: Differences

Straight Knife vs Bottom Cleaning Knife

Straight Knife vs Bottom Cleaning Knife describes two woodworking router cutters with different purposes. A straight knife uses cutting edges along its side to trim, groove, and profile vertical walls, while a bottom cleaning knife uses a wide face to flatten pocket bottoms and large surfaces.

Key Differences

• Straight knife: side cutting, narrow grooves, edge trimming, and vertical profiles.
• Bottom cleaning knife: face cutting, flat recesses, spoilboard surfacing, and large-area leveling.
• Straight knives usually have smaller diameters; bottom cleaning cutters are wider and require more spindle power.
• Both need rigid workholding, low runout, correct overlap, and effective dust extraction.

Choose by the surface that must be generated, not only by diameter. Use shallow test cuts and avoid excessive projection or depth. A dependable cutting tool manufacturer can recommend geometry and parameters; review basic woodworking router operation for additional context.

Straight and Bottom Cleaning Knife FAQ

Which tool makes a flat pocket bottom? A bottom cleaning knife is designed to sweep a wide face and leave a flat recess.

Can a straight knife flatten a surface? It can make narrow flat passes, but it is slower and more likely to leave ridges than a wide bottom cleaning cutter.