Method of making a threaded hole

Details Method of making a threaded hole Method of making a threaded hole

1990-11-21

1992-01-14

Briggs, William

Gear cutting, milling, or planing

Milling

Thread or helix generating

10140, B23G 520

Patent

active

050805380

ABSTRACT:
There is a method of making a threaded hole in a workpiece 15 whereby a core hole 9 is produced in the workpiece 15 with a combination drilling and thread milling tool 14 being advanced axially and threads are generated in the wall of the hole by a helical motion of the combination tool 14. It is desirable that the combination tool should be capable of making core holes whose diameter is greater than the drilling edge outer diameter of the combination tool. This is achieved in that the combination drilling and thread milling tool 14 in making the core hole 19 is moved on a helical path 11, 12 relative to the workpiece 15. Depending on the setting of the radius of the helical path, a different size inner diameter of the core hole is obtained.

REFERENCES:
patent: 4761844 (1988-08-01), Turchan
patent: 4930949 (1990-06-01), Giessler
patent: 4943191 (1990-07-01), Schmitt

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