STEP DRILL BIT
A step drill bit (10) comprising: a shank (12) extending along a bit axis (14); a body (18) having a proximal end (19A) adjacent the shank and a distal end (19B) opposite the proximal end, the body defining a plurality of axially stacked, progressively sized steps (20A - 20M) including a first step...
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| creator | Hohnl, Jr, Richard Sawa, Max R Pangerc, James E Parendo, Brett A Hlavac, David Ludviksson, Ingolfur Greenhill, Alexander R |
| description | A step drill bit (10) comprising: a shank (12) extending along a bit axis (14); a body (18) having a proximal end (19A) adjacent the shank and a distal end (19B) opposite the proximal end, the body defining a plurality of axially stacked, progressively sized steps (20A - 20M) including a first step (20A) at the distal end, a terminal step (20M) at the proximal end, and a plurality of intermediate steps having incrementally increasing diameters disposed between the first and terminal steps; a flute (46) in the body, the flute defining an elongated groove that extends from the distal end to the proximal end; and a plurality of cutting edges (64A - 64M) formed in the body, each cutting edge disposed along one of the plurality of steps, each cutting edge defining a helix angle (68C) and a rake angle (66C, 66M); wherein the helix angle of the cutting edge at the terminal step is greater than the helix angle of the cutting edge at the first step; and wherein the rake angle of the cutting edge at the terminal step is greater than the rake angle of the cutting edge at the first step. |
| format | Patent |
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a body (18) having a proximal end (19A) adjacent the shank and a distal end (19B) opposite the proximal end, the body defining a plurality of axially stacked, progressively sized steps (20A - 20M) including a first step (20A) at the distal end, a terminal step (20M) at the proximal end, and a plurality of intermediate steps having incrementally increasing diameters disposed between the first and terminal steps; a flute (46) in the body, the flute defining an elongated groove that extends from the distal end to the proximal end; and a plurality of cutting edges (64A - 64M) formed in the body, each cutting edge disposed along one of the plurality of steps, each cutting edge defining a helix angle (68C) and a rake angle (66C, 66M); wherein the helix angle of the cutting edge at the terminal step is greater than the helix angle of the cutting edge at the first step; and wherein the rake angle of the cutting edge at the terminal step is greater than the rake angle of the cutting edge at the first step.</description><language>eng ; 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Sawa, Max R ; Pangerc, James E ; Parendo, Brett A ; Hlavac, David ; Ludviksson, Ingolfur ; Greenhill, Alexander R</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_EP3560643B13</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng ; fre ; ger</language><creationdate>2022</creationdate><topic>BORING</topic><topic>MACHINE TOOLS</topic><topic>METAL-WORKING NOT OTHERWISE PROVIDED FOR</topic><topic>PERFORMING OPERATIONS</topic><topic>TRANSPORTING</topic><topic>TURNING</topic><toplevel>online_resources</toplevel><creatorcontrib>Hohnl, Jr, Richard</creatorcontrib><creatorcontrib>Sawa, Max R</creatorcontrib><creatorcontrib>Pangerc, James E</creatorcontrib><creatorcontrib>Parendo, Brett A</creatorcontrib><creatorcontrib>Hlavac, David</creatorcontrib><creatorcontrib>Ludviksson, Ingolfur</creatorcontrib><creatorcontrib>Greenhill, Alexander R</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Hohnl, Jr, Richard</au><au>Sawa, Max R</au><au>Pangerc, James E</au><au>Parendo, Brett A</au><au>Hlavac, David</au><au>Ludviksson, Ingolfur</au><au>Greenhill, Alexander R</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>STEP DRILL BIT</title><date>2022-06-29</date><risdate>2022</risdate><abstract>A step drill bit (10) comprising: a shank (12) extending along a bit axis (14); a body (18) having a proximal end (19A) adjacent the shank and a distal end (19B) opposite the proximal end, the body defining a plurality of axially stacked, progressively sized steps (20A - 20M) including a first step (20A) at the distal end, a terminal step (20M) at the proximal end, and a plurality of intermediate steps having incrementally increasing diameters disposed between the first and terminal steps; a flute (46) in the body, the flute defining an elongated groove that extends from the distal end to the proximal end; and a plurality of cutting edges (64A - 64M) formed in the body, each cutting edge disposed along one of the plurality of steps, each cutting edge defining a helix angle (68C) and a rake angle (66C, 66M); wherein the helix angle of the cutting edge at the terminal step is greater than the helix angle of the cutting edge at the first step; and wherein the rake angle of the cutting edge at the terminal step is greater than the rake angle of the cutting edge at the first step.</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng ; fre ; ger |
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| subjects | BORING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS TRANSPORTING TURNING |
| title | STEP DRILL BIT |
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