Circular drill with centering device

Details Circular drill with centering device Circular drill with centering device

1977-02-04

1978-05-23

Vlachos, Leonidas

Cutting by use of rotating axially moving tool

With means to apply transient, fluent medium to work or product

Including tool with duct

408 68, 408 73, 408 86, 408119, 408204, B23B 2710, B23B 5106

Patent

active

040908046

ABSTRACT:
A circular cutting head assembly and centering drill of the type used, for example, in cutting holes in structural members such as I-beam webs, and flanges. The circular drill is characterized by a cylindrical body portion, supporting an inner centering drill plug. The centering drill plug is axially depressable as a centering hole is cut, so as to be pushed out of a mode of cutting registry with the outer cutting head and into a mode of non-registry which permits axial flow of lubricating oil through the body portion and onto the surface being cut within the periphery of the cutting teeth of the outer cutting head.

REFERENCES:
patent: 3265104 (1966-08-01), Gallo, Sr.
patent: 3546980 (1970-12-01), Lemanski

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