Tuesday, 8 January 2013

Drill Tip Angle

Drill Tip Angle

Mr. Joseph Mazoff, inventor, member of the Society of Manufacturing Engineers and president of J & A Machinery started his metal crafts career in Pennsylvania as a young apprentice nine years old in a black smith shop in 1926. In 1938 at age 18, competing against more than 300 experienced competitors in their fifties and sixties, Mr. Mazoff took first place in the Pennsylvania state wide tool grinding contest, including twist drill sharpening.
Mr. Mazoff has lectured on Drill Point Geometry in various universities such as Brigham Young and other teaching institutions in nationwide states such as Texas, Kentucky, Pennsylvania, Ohio, New Mexico and other states.
Mr. Mazoff has also conducted Drill Point Geometry seminars at large machine shops at major industrial plants such as Pratt & Whitney at East Hartford, Connecticut, General Electric at Schenectady, N.Y., The Abex Corporation, The Philadelphia Naval Shipyard & other major installations that have large machine shops
Also, Mr. Mazoff authored an 11 page article titled "Choose the Best Drill Point Geometry" which was printed in the June 1989 issue of "Modern Machine Shop" magazine. (Reprints of article available by contacting "Modern Machine Shop" magazine).Back in the Appalachian Mountains where the author started his career in a blacksmith shop, electricity was unknown. Consequently, when drilling holes manually with 1 1/2" diameter drills, such drilling was painstakingly slow, requiring much time, patience and physical effort. Therefore, through experimentation; it was established that once a conical (conventional) surfaced drill was ground with a flat surface (multi-faceted point); it produced a linear chisel which required 150 percent less thrust than a conventional drill. However, as manual proficiency to grind multi-faceted points declined down through the years, such points declined accordingly because they are extremely difficult to grind by hand. However, due to the recent advent of NC machinery that demands self- centering points, multi-faceting has been revived to meet the demand.

Drill Tip Angle

Drill Tip Angle

Drill Tip Angle

Drill Tip Angle

Drill Tip Angle

Drill Tip Angle

Drill Tip Angle

Drill Tip Angle

Drill Tip Angle

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