Diameter selection:

The principle is to choose large-diameter cutting tools as much as possible, provided that they can enter the processing area. For example, to clean a 100mm wide groove bottom, using a 10mm diameter bottom cleaning knife will be more than 10 times more efficient than using a 3mm one.

It should be noted that the diameter of the tool should be smaller than the minimum fillet radius inside the cavity.

Blade length selection:

The blade length should be slightly greater than the depth that needs to be cleaned, but should not be too long to prevent vibration.

Blade selection:

Processing wood and plastic: Two blades are the best balance to ensure sufficient chip space and prevent chip accumulation from burning.

Processing acrylic, aluminum, and composite materials: 2-blade or single blade, with good chip removal to avoid melting and adhesion.

When the requirement for the smoothness of the bottom surface is extremely high, a 3-blade spiral bottom cleaning knife can be used.

Material:

Solid hard alloy: mainstream choice, sharp and wear-resistant.

For ultra large flat surfaces (woodworking): flying knives with hard alloy blades may be used