Variable helix cutting tools

Details Variable helix cutting tools Variable helix cutting tools

2006-02-21

2006-02-21

Fridie, Jr., Willmon (Department: 3722)

Cutters, for shaping

Rotary cutting tool

Face or end mill

C407S056000, C407S063000

Reexamination Certificate

active

07001113

ABSTRACT:
Tools, including end mills, include a flute having a helix which varies along the length of the tool. The invention is not limited in terms of the number of flutes, whether odd or even; helix change(s) within a flute or between flutes; or indexing between cutting edges or flutes. Nor is the invention limited in terms of materials used, and may employ carbide or high-speed steel grades of materials, ceramics, or any other material that will be used in the future for material removal in a rotary tool. According to the invention, a ‘slow’ or ‘high’ helix may be used at the end or starting point of the tool, depending upon the application. A slow helix at the end or starting point is desirable for a strong corner in ramping and plunging into the material. When a higher helix is used at the end transitioning to a smaller helix at the shank, the corner is also protected because of the helix change. The high helix at the tip may be needed for shearing action in a given material.

REFERENCES:
patent: 5035617 (1991-07-01), McSpadden
patent: 5478176 (1995-12-01), Stedt et al.
patent: 6345941 (2002-02-01), Fang et al.
patent: 6439811 (2002-08-01), Wardell

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