Invention Grant
- Patent Title: Spiral drill bit and method of forming same
- Patent Title (中): 螺旋钻头及其形成方法
-
Application No.: US11969622Application Date: 2008-01-04
-
Publication No.: US08029215B2Publication Date: 2011-10-04
- Inventor: Charles L. Gentry , William F. Nordlin
- Applicant: Charles L. Gentry , William F. Nordlin
- Applicant Address: US IL Rockford
- Assignee: Greenlee Textron Inc.
- Current Assignee: Greenlee Textron Inc.
- Current Assignee Address: US IL Rockford
- Agency: Clark Hill PLC
- Main IPC: B23B51/02
- IPC: B23B51/02

Abstract:
A spiral drill bit for forming holes of a variety of sizes has a main body which provides first and second helical grooves. First and second flutes extend along the length of the main body to provide first and second helical groove segments. Cutting segments are provided between the helical groove segments. The method for forming the spiral drill bit includes turning the helical groove segments onto a round stock. An axial clearance and an initial diametral clearance are provided upon turning the helical grooves. A grinding process is used to form a radial clearance and a final diametral clearance. The reduction to the amount of grinding required to form the spiral drill bit results in a reduction to the cost of production and a reduction in the time necessary to produce the spiral drill bit.
Public/Granted literature
- US20080166195A1 SPIRAL DRILL BIT AND METHOD OF FORMING SAME Public/Granted day:2008-07-10
Information query