US3199381A - Twist drill - Google Patents

Twist drill Download PDF

Info

Publication number
US3199381A
US3199381A US262561A US26256163A US3199381A US 3199381 A US3199381 A US 3199381A US 262561 A US262561 A US 262561A US 26256163 A US26256163 A US 26256163A US 3199381 A US3199381 A US 3199381A
Authority
US
United States
Prior art keywords
cutting
faces
tip
cutting tip
drill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US262561A
Inventor
Bruce A Mackey
Original Assignee
Bruce A Mackey
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bruce A Mackey filed Critical Bruce A Mackey
Priority to US262561A priority Critical patent/US3199381A/en
Application granted granted Critical
Publication of US3199381A publication Critical patent/US3199381A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B51/00Tools for drilling machines
    • B23B51/02Twist drills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2240/00Details of connections of tools or workpieces
    • B23B2240/08Brazed connections
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/48Chip breakers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/50Drilling tools comprising cutting inserts
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/78Tool of specific diverse material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/89Tool or Tool with support
    • Y10T408/907Tool or Tool with support including detailed shank
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/89Tool or Tool with support
    • Y10T408/909Having peripherally spaced cutting edges
    • Y10T408/9095Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097Spiral channel

Description

g 10, 1955 B. A. MACKEY 3,199,381

TWIST DRILL Filed March 4, 1963 2 she -s 1 INVENT R. firace d2 777ac%2y Aug. w, 1965 B. A. MACKEY TWIST DRILL 2 Sheets-Sheet 2 Filed March 4, 1963 INVENTOR. Bruce Q 2. macffey (/Qi fy,

3,19,331 TWIST DRILL Bruce A. Mackey, RU. Box 363, Libertyville, Ill. Filed Mar. 4, I953, Ser. No. 262,561 10 Claims. (Cl. 77--7tl) This invention relates in general to drills, and more particularly to improvements in carbide tipped twist drills.

In the past it has been Well known to provide a drill with a hardened point to increase the life of the drill, and to facilitate the passage of the drill through the work. It is also conventional practice to braze a tip of hard material, such as carbide, to the end of the drill to achieve these results. While such expedients have in general served their purpose, they have not proven entirely satisfactory under all conditions of service for the reason that the great amout of heat created when drilling through certain materials has caused the brazed connection of the carbide tip to the drill to break down and the tip to be dislodged. The general purpose of the present invention is therefore to provide a carbide tip twist drill construction which will reduce the amount of heat created by the drilling action, and subsequently reduce the amount of stress imparted to the carbide tip.

An object of the present invention is the provision of a drill which is capable of drilling through different materials having diverse characteristics, such as, wood, cast iron, steel and plastics.

Another object of the present invention is the provision of a twist drill which is capable of drilling a deep hole without binding.

A further object of the invention is the provision of means on the carbide tip to enhance the cutting ability of the drill through the work.

Still another object of the invention is to provide an improved drill which is simple in construction, efiicient in operation, well adapted for its intended purposes, and relatively inexpensive to manufacture and maintain.

These and other objects of the invention will become more fully apparent from the specification and drawing wherein:

FIGURE 1 is a front elevational view of a preferred embodiment of the invention,

FIGURE 2 is a detail view of the carbide tip used in the embodiment illustrated in FIGURE 1 prior to sharpening,

FIGURE 3 is a top view of the tip illustrated in FIG- URE 2,

FIGURE 4 is a sectional view taken along line 44 of FIGURE 2 showing the tip in a sharpened condition,

FIGURE 5 is a sectional view taken along line 55 of FIGURE 2 showing the tip in a sharpened condition,

FIGURE 6 is a front elevational view of a second embodiment of the carbide tip,

FIGURE 7 is a sectional view taken along line 7--7 of FIGURE 6,

FIGURE 8 is a sectional view taken along line 88 of FIGURE 6,

FIGURE 9 is a front elevational view of a third embodiment of the carbide tip, and

FIGURE 10 is a view taken along line 10--10 of FIG- URE 9.

Referring now to the drawing, wherein like reference characters designate like or corresponding parts throughout the several views, reference numeral 10 is used in FIGURE 1 to indicate the preferred embodiment of the twist drill in its entirety. Twist drill 10 comprises an elongated shank 11 terminating in a stub portion 12, which is adapted to be gripped in a suitable chucking means, not shown.

Shank I1 is provided with a spiral groove 13 which extends axially along the shank substantially from one end nited States Patent C) of the drill to the other. Shank 11 is preferably plated with a hard material, such as chrome or the like, to provide a smooth surface which facilitates passage of the drilled work particles along groove 13. Groove 13 is cut deeply into the sides of shank 11 to allow particles of relatively large size to pass along the groove. Because of the depth of the groove 13, the mouth of the groove is exceptionally wide and the number of revolutions which the groove makes around the shank is materially reduced. This shortens the path which the out work particles must travel from the cutting edge of the drill to their point of emergence at the opposite end of the drill. These features cooperate to provide a drill which will cut through the work without packing of the out work particles and therefore without binding. It is obvious that such a drill will cut a deep hole in the work without excessive heating, and will substantially eliminate the necessity of removing the drill from the hole to discharge the accumulated work particles from the drill flutes. It should also be noted when drilling a shallow hole the problem of excessive heating is not present, and the drill may be provided with a smooth cylindrically shaped shank, which eliminates the necessity of providing grooves 13.

A cutting tip 14, formedof an exceptionally hard material such as carbide, ceramic or the like, is affixed to the forward end of the drill as by brazing, welding or the equivalent fastening means. Tip 14 is provided with a pair of cutting edges 15 and is which taper forwardly to a point 17. Tip 14 further includes a pair of side edges 18 and 19 which taper rearwardly from their junction with cutting edges 15 and 16 to form a base 20 of reduced width. The provision of tapered side edges is important in that it reduces the amount of the tip which contacts the wall of the hole being drilled. This eliminates the scraping of the side edges upon the wall of the hole being drilled, which is prevalent in known devices having side edges which are parallel to the axis of the drill. The elimination of the frictional engagement of the tip side edges with the walls of the hole being drilled materially reduces the amount of heat created by the drilling action, and thus obviates the possibility of the tip becoming unbonded from the drill shank.

Grooves 21 and 22 are provided in opposite faces of tip 14 adjacent to and parallel with cutting edges 15 and 16, respectively. Grooves 21 and 22 are positioned in the leading faces of tip 14, when the drill is rotated clockwise as viewed in FIGURE 1, and form, in combination, means for cutting the work from the bottom of the hole being drilled. This enhanced cutting action is extremely important when drilling hard to drill materials, such as cast iron or some plastics, in that it reduces the possibility of the drill breaking during the drilling action, since a minimum amount of power is required in cutting, and the chips are broken up in small chunks so as to pass out the hole being drilled without packing or binding. Surfaces 23 and 24 are ground so as to be positioned at an acute angle with respect to the faces of tip 14 to produce a sharpened positive cutting edge.

Referring now to FIGURES 68, another embodiment is shown which has particular utility when drilling hard materials, such as, stainless steel or tool steel. In this embodiment the tip 25 has the same configuration as the embodiment shown in FIGURES 1-5, that is, side edges 26 and 27 taper rearwardly from their junction with cutting edges 28 and 29 to form a base 30 of reduced width, and surfaces 30 and 31 are ground so as to be positioned at an angle with respect to the faces of the tip. However, it will be noted that the grooves 32 and 33, which are adjacent to and parallel with edges 28 and 29, do not extend the entire length of the cutting edges, and thus define a central ungrooved portion 34 of uniform thickness adjacent point 35. The presence of a Z solid ungrooved portion 34- prevents the accumulation of fine chips and particles in the grooves adjacent point 34, and thus reduces the pressure buildup at the point and materially strengthens the tip.

The tip embodiment illustrated in FIGURES 9 and is substantially identical to that shown in FIGURES 6-8 except that the solid portion 34 is extended outwardly ahead of cutting edges 28 and 29. This enables a small pilot hole to be out ahead of the main hole being drilled, which stabilizes the drill to a large extent, and allows the drill to cut without tearing and without chaering.

Thus it can be readily understood that what has been provided is an improved twist drill which can effectively cut through many different materials having diverse characteristics in an efiicient manner, and with a materially reduced possibility of failure. It should also be understood that the invention has been illustrated in a preferred form only and improvements and modifications may be made therein without departing from the spirit and the scope of the invention as set forth in the appended claims.

What is claimed is:

f. A drill comprising: an elongate shank having a longitudinal axis; a cutting tip afiixed to the forward end of said shank; said cutting tip htving generally parallel front and rear faces with side faces disposed transversely with respect to said front and rear faces, said side faces tapering generally uniformly rearwardly at an acute angle with respect to the axis of said shank to define a cutting tip base of reduced width at the rearward end of said cutting tip; and cutting tip including cutting faces at the forward end thereof, each of said cutting faces tapering forwardly from the forwardmost end of one of said side faces, and converging toward one another to define a leading cutting tip point; one of said cutting faces being disposed at an acute angle with respect to said cutting tip front face to define a cutting edge at the forwardmost portion of the cutting tip front face, and the other cutting face being disposed at an acute angle with respect to said cutting tip rear face to define a cutting edge at the forwardmost portion of the cutting tip rear face.

2. A drill as defined in claim it in which said shank has a substantially cylindrical outer periphery, and wherein a spiral groove is provided in said shank extending longitudinally therealong.

3. The invention set forth in claim 1 wherein said tip is formed of a carbide material.

4. A drill as defined in claim It wherein a groove is provided in each of the front and rear faces of the cutting tip adjacent to and parallel their respective cutting edges.

5. A drill as defined in claim 4 wherein said grooves are immediately adjacent their respective cutting edges, so that said cutting edges overlie their respective grooves and form Wall means defining one side of the groove.

6. The invention set forth in claim 4 wherein said grooves are substantially coextensive with said cutting edges.

'7. The invention set forth in claim 4 wherein said grooves terminate short of said point to define a solid ungrooved portion adjacent said point.

2%. The invention set forth in claim 7 wherein said solid ungrooved portion extends forwardly from said cutting edges.

9. A drill comprising: an elongate generally cylindrical shank having a longitudinal axis, said shank having a relatively wide spiral groove therein extending longitudinally therealong; a hardened cutting tip affixed to the forward end of said shank; said cutting tip having generaily parallel front and rear faces with side faces disposed transversely with respect to said front and rear faces, said side faces tapering generally uniformly rearwardiy at an acute angle with respect to the axis of said shank to define a cutting tip base of reduced width at the rearward end of said cutting tip, said angle being sufficiently large so that only the forwardrnost portions of said side faces contact the side wall of a hole being drilled; said cutting tip including cutting faces at the forward end thereof, each of said cutting faces tapering forwardly from the foiwvardrnost end of one of said side faces, and converging toward one another to define a leading cutting tip point; one of said cutting faces being disposed at an acute angle with respect to said cutting tip front face to define a cutting edge at the forwardmost portion of the cutting tip front face, and the other cuting face being disposed at an acute angle with respect to said cutting tip rear face to define a cutting edge at the forwardmost portion of the cutting tip rear face; and an arcuate groove in said front and rear faces immediate- 1y adjacent and parallel with the cutting edge thereon. id. A cutting tip for use in a drill comprising: a cutting tip body adapted to rotate about a longitudinal axis and having generally parallel front and rear faces with sides faces disposed transversely with respect to said front and rear faces, said side faces tapering generally uniformly rearwardly at an acute angle with respect to said axis to define a cutting tip base of reduced width at the rearwardend of said cutting tip, said angle being sufficienly large so that only the forwardmost portions of said side faces contact the side wall of a hole being drilled; said cutting tip body including cutting faces at the forward end thereof, each of said cutting faces tapering forwardly from the forwardinost end of one of said side faces, and converging toward one another to define aleading cutting tip point; one of said cutting faces being disposed at an acute angle with respect to the front face of said cutting tip body to define a cutting edge at the forwardmost portion or" the cutting tip front face and the other cutting face being disposed atan acute angle with respect to the rear face of said cutting tip body to define a cutting edge at the forwardrnost portion of the cutting tip rear face; and an arcuate groove in said front and rear faces immediately adjacent and parallel with the cutting edge thereon.

References titted by the Examiner UNITED STATES PATENTS 3,099,174 7/63 Cogsdill 77-73.5 3,117,637 1/ 64 Mortensen 77-70 XR FOREIGN PATENTS 550,306 1/43 Great Britain.

W ELLIAM W. DYER, IR., Primary Examiner.

l. SPENCER OVERHOLSER, ANDREW R. JUHASZ,

am ners.

Claims (1)

1. A DRILL COMPRISING: AN ELONGATE SHANK HAVING A LONGITUDINAL AXIS; A CUTTING TIP AFFIXED TO THE FORWARD END OF SAID SHANK; SAID CUTTING TIP HAVING GENERALLY PARALLEL FRONT AND REAR FACES WITH SIDE FACES DISPOSED TRANSVERSELY WITH RESPECT TO SAID FRONT AND REAR FACES, SAID SIDE FACES TAPERING GENERALLY UNIFORMLY REARWARDLY AT AN ACUTE ANGLE WITH RESPECT TO THE AXIS OF SAIAD SHANK TO DEFINE A CUTTING TIP BASE OF REDUCED WIDTH AT THE REARWARD END OF SAID CUTTING TIP; AND CUTTING TIP INCLUDING CUTTING FACES AT THE FORWARD END THEREOF, EACH OF SAID CUTTING FACES TAPERING FORWARDLY FROM THE FORWARDMOST END OF ONE OF SAID SIDE FACES, AND CONVERGING TOWARD ONE ANOTHER TO DEFINE A LEADING CUTTING TIP POINT; ONE OF SAID CUTTING FACES BEING DISPOSED AT AN ACUTE ANGLE WITH RESPECT TO SAID CUTTING TIP FRONT FACE TO DEFINE A CUTTING EDGE AT THE FORWARDMOST PORTION OF THE CUTTING TIP FRONT FACE, AND THE OTHER CUTTING
US262561A 1963-03-04 1963-03-04 Twist drill Expired - Lifetime US3199381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US262561A US3199381A (en) 1963-03-04 1963-03-04 Twist drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US262561A US3199381A (en) 1963-03-04 1963-03-04 Twist drill

Publications (1)

Publication Number Publication Date
US3199381A true US3199381A (en) 1965-08-10

Family

ID=22998033

Family Applications (1)

Application Number Title Priority Date Filing Date
US262561A Expired - Lifetime US3199381A (en) 1963-03-04 1963-03-04 Twist drill

Country Status (1)

Country Link
US (1) US3199381A (en)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2555979A1 (en) * 1975-12-12 1977-06-30 Walter Gmbh Montanwerke plastics with indexable inserts tipped drill for metallic materials and
US4286904A (en) * 1979-07-16 1981-09-01 Parker Manufacturing Company Wood bit
US4293258A (en) * 1977-10-04 1981-10-06 Microdot Inc. Self drilling blind rivet
US4373518A (en) * 1980-09-26 1983-02-15 Zimmer, Inc. Method of drilling living bone
FR2592693A1 (en) * 1986-01-09 1987-07-10 Usm Corp Drilling and self-tapping screw and pair of dies for its manufacture.
US4725175A (en) * 1986-01-09 1988-02-16 Usm Corporation Groove point screw
US5184689A (en) * 1991-03-06 1993-02-09 Kennametal Inc. Radial cut drill bit insert
US5918105A (en) * 1994-12-12 1999-06-29 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
US6102634A (en) * 1995-07-29 2000-08-15 Black & Decker Inc. Masonry drill bit
US6113321A (en) * 1995-07-29 2000-09-05 Black & Decker Inc. Roll-forged drill bit
US6174111B1 (en) 1994-12-12 2001-01-16 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
US6685402B2 (en) * 2001-03-27 2004-02-03 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
WO2004087356A1 (en) * 2003-04-04 2004-10-14 Tbt Tiefbohrtechnik Gmbh + Co Single-lip drill and method for the production thereof
US20040223823A1 (en) * 2001-03-27 2004-11-11 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
WO2005046914A2 (en) 2003-11-07 2005-05-26 Allied Machine & Engineering Corp. Spade drill insert having curved cutting edges
US20060029477A1 (en) * 2004-08-09 2006-02-09 Muniswamappa Anjanappa High speed metal drill bit
US20070036622A1 (en) * 2005-08-12 2007-02-15 Yg-1 Co., Ltd. Spade drill insert
US20090110503A1 (en) * 2007-10-28 2009-04-30 Iscar, Ltd. Cutting head of a reamer
US20100143055A1 (en) * 2007-05-20 2010-06-10 Guehring Ohg Rotably drivable cutting tool
US20100254779A1 (en) * 2009-04-07 2010-10-07 Hans Wedner Solid step drill
EP3006748A1 (en) * 2014-10-09 2016-04-13 Berner Trading Holding GmbH Drill bit
US20170066063A1 (en) * 2015-09-08 2017-03-09 Tct Global Limited Drill structure
US20170182566A1 (en) * 2015-12-28 2017-06-29 Diamond Innovations, Inc. Polycrystalline diamond drill bit having a laser cut chip breaker
US20170225241A1 (en) * 2014-07-29 2017-08-10 Kyocera Corporation Drill and method of manufacturing machined product using the same
US10507534B2 (en) 2016-03-17 2019-12-17 O-Tags, Inc. Systems, methods, and apparatus for reliably installing survey tags

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB550306A (en) * 1942-01-19 1943-01-01 Herbert Ltd A Improvements relating to drills and to cutters therefor
US3099174A (en) * 1960-06-29 1963-07-30 Cogsdill Tool Prod Countersinking tool
US3117637A (en) * 1960-11-01 1964-01-14 Mortensen Louis Aackersberg Drill bit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB550306A (en) * 1942-01-19 1943-01-01 Herbert Ltd A Improvements relating to drills and to cutters therefor
US3099174A (en) * 1960-06-29 1963-07-30 Cogsdill Tool Prod Countersinking tool
US3117637A (en) * 1960-11-01 1964-01-14 Mortensen Louis Aackersberg Drill bit

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2555979A1 (en) * 1975-12-12 1977-06-30 Walter Gmbh Montanwerke plastics with indexable inserts tipped drill for metallic materials and
US4293258A (en) * 1977-10-04 1981-10-06 Microdot Inc. Self drilling blind rivet
US4286904A (en) * 1979-07-16 1981-09-01 Parker Manufacturing Company Wood bit
US4373518A (en) * 1980-09-26 1983-02-15 Zimmer, Inc. Method of drilling living bone
GB2185915B (en) * 1986-01-09 1989-11-22 Emhart Enterprises Groove point screw
FR2592693A1 (en) * 1986-01-09 1987-07-10 Usm Corp Drilling and self-tapping screw and pair of dies for its manufacture.
US4725175A (en) * 1986-01-09 1988-02-16 Usm Corporation Groove point screw
GB2185915A (en) * 1986-01-09 1987-08-05 Usm Corp Drilling and thread forming fastener
US5184689A (en) * 1991-03-06 1993-02-09 Kennametal Inc. Radial cut drill bit insert
US5918105A (en) * 1994-12-12 1999-06-29 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
US6174111B1 (en) 1994-12-12 2001-01-16 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
US6102634A (en) * 1995-07-29 2000-08-15 Black & Decker Inc. Masonry drill bit
US6113321A (en) * 1995-07-29 2000-09-05 Black & Decker Inc. Roll-forged drill bit
US6328506B1 (en) * 1995-07-29 2001-12-11 Black & Decker Inc. Masonry drill bit
US20060147285A1 (en) * 2001-03-27 2006-07-06 Allied Machine & Enginnering Corp. Drill Insert Geometry having V-Notched Web
US20040179913A1 (en) * 2001-03-27 2004-09-16 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
US7114893B2 (en) 2001-03-27 2006-10-03 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
US20040223823A1 (en) * 2001-03-27 2004-11-11 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
US6685402B2 (en) * 2001-03-27 2004-02-03 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
US6986628B2 (en) 2001-03-27 2006-01-17 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
US7371035B2 (en) 2001-03-27 2008-05-13 Allied Machine & Engineering Corp. Drill insert geometry having V-notched web
US7753627B2 (en) 2003-04-04 2010-07-13 Tbt Tiefbohrtechnik Gmbh & Co. Single-lip drill and method for the production thereof
WO2004087356A1 (en) * 2003-04-04 2004-10-14 Tbt Tiefbohrtechnik Gmbh + Co Single-lip drill and method for the production thereof
US20070041801A1 (en) * 2003-04-04 2007-02-22 Tbt Tiefbohrtechnik Gmbh + Co. Single-lip drill and method for the production thereof
WO2005046914A2 (en) 2003-11-07 2005-05-26 Allied Machine & Engineering Corp. Spade drill insert having curved cutting edges
EP1682295A2 (en) * 2003-11-07 2006-07-26 Allied Machine & Engineering Corp. Spade drill insert having curved cutting edges
EP1682295A4 (en) * 2003-11-07 2008-07-16 Allied Machine & Eng Corp Spade drill insert having curved cutting edges
US7241089B2 (en) * 2003-11-07 2007-07-10 Allied Machine & Engineering Corp. Drill insert having curved cutting edges
US20060159534A1 (en) * 2003-11-07 2006-07-20 Allied Machine & Engineering Corp. Drill Insert Having Curved Cutting Edges
US7237986B2 (en) * 2004-08-09 2007-07-03 Black & Decker Inc. High speed metal drill bit
US20060029477A1 (en) * 2004-08-09 2006-02-09 Muniswamappa Anjanappa High speed metal drill bit
US20070036622A1 (en) * 2005-08-12 2007-02-15 Yg-1 Co., Ltd. Spade drill insert
US20100143055A1 (en) * 2007-05-20 2010-06-10 Guehring Ohg Rotably drivable cutting tool
US8568068B2 (en) * 2007-05-20 2013-10-29 Guehring Ohg Rotatably drivable cutting tool
US20090110503A1 (en) * 2007-10-28 2009-04-30 Iscar, Ltd. Cutting head of a reamer
US8109701B2 (en) * 2007-10-28 2012-02-07 Iscar, Ltd. Cutting head of a reamer
US20100254779A1 (en) * 2009-04-07 2010-10-07 Hans Wedner Solid step drill
US9004826B2 (en) * 2009-04-07 2015-04-14 Sandvik Intellectual Property Ab Solid step drill
US20170225241A1 (en) * 2014-07-29 2017-08-10 Kyocera Corporation Drill and method of manufacturing machined product using the same
US10259050B2 (en) * 2014-07-29 2019-04-16 Kyocera Corporation Drill and method of manufacturing machined product using the same
EP3006748A1 (en) * 2014-10-09 2016-04-13 Berner Trading Holding GmbH Drill bit
US20170066063A1 (en) * 2015-09-08 2017-03-09 Tct Global Limited Drill structure
US20170182566A1 (en) * 2015-12-28 2017-06-29 Diamond Innovations, Inc. Polycrystalline diamond drill bit having a laser cut chip breaker
US10029316B2 (en) * 2015-12-28 2018-07-24 Diamond Innovations, Inc. Polycrystalline diamond drill bit having a laser cut chip breaker
US10507534B2 (en) 2016-03-17 2019-12-17 O-Tags, Inc. Systems, methods, and apparatus for reliably installing survey tags

Similar Documents

Publication Publication Date Title
US4222690A (en) Drill having cutting edges with the greatest curvature at the central portion thereof
FI81295B (en) Stenborr.
US3765789A (en) Annular hole cutter
US5272940A (en) Helically fluted tool
KR100293592B1 (en) drill
US4060335A (en) Spade drill
US4804231A (en) Point attack mine and road milling tool with replaceable cutter tip
US5038859A (en) Cutting tool for removing man-made members from well bore
US6786684B1 (en) Tubular hole cutter
US4480951A (en) Self-drilling screw
KR100193531B1 (en) Drill with replaceable cutting insert
DE3442546C2 (en)
US4432264A (en) Circular saw blade
US6354771B1 (en) Cutting or breaking tool as well as cutting insert for the latter
US3045322A (en) Cutting tool with removable bit
US4132493A (en) Ball end mill
US4057357A (en) Chipless shell cutter for large diameter plastic pipe
US3232145A (en) Hand reamer
US2966081A (en) Drill
JP2008530393A (en) Chisel holder
US2621548A (en) Mounting for cutting tools
US1123730A (en) Annular bone-saw.
US4325153A (en) Combined screwdriver and boring apparatus
KR20000053040A (en) Tool for chip removing machining
US7674078B1 (en) Hole saw having efficient slug removal