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.
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