NACHI-FUJIKOSHI CORP.

• NACHI Tool Solutions

Type

There are two types of cutting edge shape for carbide end mills: gashland and sharp corner.

About the difference of the cutting edge and the use

The cutting edge corner of the end mill is driven in from four sides of the helix angle, the rake angle, the radial relief angle, and axial relief angle, resulting in a smaller blade angle.

Chipping of the corners is likely to occur for machining with large vibrations and impacts, such as high depth of cut, high feed, and grooving.

As a countermeasure, when grooving the bottom blade (gash), the strength of the cutting edge may be increased by putting the rake face of the bottom blade to the outer peripheral corners. That's "Gashland (G type)".

However, when the gashland is attached, the cutting edge corner moves backward from the outer diameter direction, in a strict sense, corner remains on the machined surface.

Use a Sharp corner (S type) end mill to remove the rest of the corner (pin angle).