Combined hole making and threading tool

Abstract

A combination tool is disclosed for drilling a hole in a workpiece on the inward feed of the tool and for threading the hole during retraction of the tool. The tool comprises a straight body with a drill point at the forward end, a shank at the rearward end and a threadform mill between the drill point and the shank.

What is claimed is: 
     
       1. .[.For.]. .Iadd.A hole making and threading tool for .Iaddend.use in a machine tool which is adapted to .[.simultaneously.]. rotate a cutting tool about its axis and feed the cutting tool axially for cutting a hole in .Iadd.an imperforate surface of a solid portion of .Iaddend.a workpiece and .[.adapted to simultaneously rotate said cutting tool about its axis,.]. .Iadd.thereafter concurrently .Iaddend.move .[.the.]. .Iadd.said .Iaddend.axis in an orbital path and .[.move the cutting tool.]. axially whereby a point on the cutting tool defines a helical path, .[.a.]. .Iadd.said .Iaddend.hole making and threading tool comprising: an elongated straight body having a shank at one end.[.,.]..Iadd.; .Iaddend.a hole making means at the other end .Iadd.for making said hole in said imperforate surface of said solid portion of said workpiece, said hole having a wall; .Iaddend.and a thread making means intermediate said .[.ends,.]. .Iadd.one end and said other end; and .Iaddend.   .[.and.]. at least one chip removal passage extending from said hole making means through said thread making means .[.,.]..Iadd.; .Iaddend.   said thread making means having a .[.uniform.]. maximum diameter .[.equal to.]. .Iadd.which is no greater than .Iaddend.the maximum diameter of said hole making means whereby said thread making means can enter .[.the.]. .Iadd.said .Iaddend.hole made by .[.the.]. .Iadd.said .Iaddend.hole making means .Iadd.in said imperforate surface of said solid portion of said workpiece .Iaddend.without interference .Iadd.with said wall of said hole to thereafter form a thread in said wall.Iaddend..   
     
     
       2. The invention as defined in claim 1 wherein said hole making means is a drill .Iadd.form.Iaddend.. 
     
     
       3. The invention as defined in claim 1 wherein said thread making means is a thread-form mill. 
     
     
       4. The invention as defined in claim 1 wherein said hole making means is a drill .Iadd.form .Iaddend.and said thread making means is a thread-form mill. 
     
     
       5. The invention as defined in claim 1 wherein said hole making means comprises a drill point.[.,.]. and said thread making means comprises a thread-form mill having a plurality of thread-form cutters. 
     
     
       6. The invention as defined in claim 1 wherein said thread making means is a thread-form .[.mill.]. for making female threads having a minimum diameter no smaller than the diameter of said hole. 
     
     
       7. .[.For.]. .Iadd.A hole making and threading tool for .Iaddend.use in a machine tool which is adapted to  .Iadd.simultaneously .Iaddend.rotate a cutting tool about its axis and feed .[.the.]. .Iadd.said .Iaddend.cutting tool axially for cutting a hole in .Iadd.an imperforate surface of a solid portion of .Iaddend.a workpiece and .[.adapted to simultaneously rotate said cutting tool about its axis,.]. .Iadd.thereafter concurrently .Iaddend.move .[.the.]. .Iadd.said .Iaddend.axis in an orbital path and .[.move the cutting tool.]. axially whereby a point on said cutting tool defines a helical path, .[.a.]. .Iadd.said .Iaddend.hole .[.cutting.]. .Iadd.making .Iaddend.and threading tool comprising: an elongated body having a shank at one end adapted to be held by said machine tool.[.,.]..Iadd.;.Iaddend.   a hole cutter at the other end.[.,.]. .Iadd.for making said hole in said imperforate surface of said solid portion of said workpiece, said hole having a wall; .Iaddend.   .[.and.]. an axially extending thread-form mill intermediate said shank and said hole cutter.[.,.]..Iadd.;.Iaddend.   .[.and.]. at least one chip removal passage extending from said hole cutter through said thread-form mill.[.,.]..Iadd.; and.Iaddend.   said thread-form mill having a .[.uniform.]. maximum diameter .[.equal to.]. .Iadd.no greater than .Iaddend.the maximum diameter of said hole cutter whereby said thread-form mill can enter .[.a.]. .Iadd.said .Iaddend.hole made by said hole cutter .Iadd.in said imperforate surface of said solid portion of said workpiece .Iaddend.without interference .Iadd.with said wall of said hole to thereafter form a thread in said wall.Iaddend.. .Iadd.8. The invention as defined in claim 1 wherein said thread making means has a uniform maximum diameter equal to said maximum diameter of said hole making means..Iaddend. .Iadd.9. The invention as defined in claim 1 further comprising at least one chip removal passage extending from said hole making means through said thread making   
     
     
        means..Iaddend. .Iadd.10.  The invention as defined in claim 1 wherein said maximum diameter of said thread making means is a uniform diameter..Iaddend. .Iadd.11. The invention as defined in claim 7 wherein said hole cutter comprises a drill point form..Iaddend. .Iadd.12. A method for producing a threaded hole in an imperforate surface of a solid portion of a workpiece, said method comprising the steps of: providing an elongated tool having an axis of rotation, a hole making means at one end, and a thread making means on the side thereof;   rotating said tool about said axis of rotation while shifting it axially to move said hole making means against and into said imperforate surface of said solid portion of said workpiece to form a hole therein, said hole having a wall;   while rotating said tool, concurrently moving said axis of rotation orbitally around said hole and axially along said axis of rotation to produce threads in said wall of said hole;   displacing said axis of rotation back to the center of said hole; and   retracting said tool from said hole..Iaddend. .Iadd.13. The method as defined in claim 12 wherein during orbital movement of said axis of rotation of said tool it is shifted axially one thread pitch to mill helical threads in said wall of said hole..Iaddend. .Iadd.14. The method as defined in claim 12 wherein said tool is displaced radially to displace said axis of rotation..Iaddend. .Iadd.15. The method as defined in claim 13 wherein said tool is displaced radially to displace said axis of rotation..Iaddend. .Iadd.16. The method as defined in claim 12 wherein said axis of rotation of said tool is moved orbitally through three hundred sixty degrees around said hole..Iaddend. .Iadd.17. The method as defined in claim 13 wherein said axis of rotation of said tool is moved orbitally through three hundred sixty degrees around said hole..Iaddend.   
     
     
        .Iadd.18.  The method as defined in claim 12 wherein said tool is displaced radially to displace sad axis of rotation, and said axis of rotation is moved orbitally through three hundred sixty degrees around said hole..Iaddend. .Iadd.19. The method as defined in claim 13 wherein said tool is displaced radially to displace said axis of rotation, and said axis of rotation is moved orbitally through three hundred sixty degrees around said hole..Iaddend. .Iadd.20. The method as defined in claim 12 further comprising the step of introducing a fluid under pressure into said hole adjacent the bottom thereof and causing said fluid to flow along said tool toward the mouth of said hole..Iaddend. .Iadd.21. The method as defined in claim 20 wherein said fluid under pressure is introduced into said hole through said tool..Iaddend. .Iadd.22. The method as defined in claim 12 wherein prior to said step of concurrently moving said axis of rotation orbitally and axially said tool is moved axially out of said hole to provide a clearance for said hole making means..Iaddend. .Iadd.23. A method of producing a threaded hole in an imperforate surface of a solid portion of a workpiece, said method comprising the steps of: providing an elongated tool having an axis of rotation, a drill means at one end and a thread milling profile along the side thereof;   rotating said tool about said axis of rotation while shifting it axially to move said drill means against and into said imperforate surface of said solid portion of said workpiece to form a hole therein, said hole having a wall;   while continuing to rotate said tool, concurrently moving said axis of rotation orbitally around said hole at least three hundred sixty degrees and shifting it axially along said axis of rotation one thread pitch to form threads in said wall of said hole;   displacing said tool back to the center of said hole; and   
     
     
       retracting said tool from said hole..Iaddend. .Iadd.24.  The method as defined in claim 23 wherein during said orbital movement step said tool is axially shifted in a direction out of said hole one thread pitch..Iaddend. .Iadd.25. The method as defined in claim 23 wherein said tool is symmetrical with respect to a longitudinal axis which is substantially coincident with said axis of rotation..Iaddend. .Iadd.26. The method as defined in claim 23 wherein prior to said step of concurrently moving said axis orbitally and axially said tool is moved axially out of said hole to provide a clearance for said drill means..Iaddend. .Iadd.27. A hole making and threading tool comprising: a shank having one end portion, an opposite end portion and an intermediate portion therebetween, said one end portion being adapted to be engaged for rotation and manipulation, said opposite end portion having hole making means for making a hole having a wall as said tool is rotated and manipulated longitudinally into an imperforate surface of a solid portion of a workpiece, said hole making means having an axis of rotation and a maximum diameter;   at least one longitudinally extending flute on said shank; and   thread cutting means located on said intermediate portion of said shank for cutting a thread in said wall of said hole in said imperforate surface of said solid portion of said workpiece, said thread cutting means having a maximum diameter no greater than said maximum diameter of said hole making means whereby said thread cutting means can enter said hole made by said hole making means in said imperforate surface of said solid portion of said workpiece without interference with said wall of said hole to   
     
     
        thereafter form a thread in said wall..Iaddend. .Iadd.28.  The invention as defined in claim 27 wherein there are a plurality of flutes and said tool is symmetrical about a longitudinal axis and the longitudinal center of mass substantially coincides with such longitudinal axis..Iaddend. .Iadd.29. The invention as defined in claim 27, further comprising means defining a fluid passageway extending axially within said tool for communication at said one end portion with a source of fluid under pressure and opening outwardly of said tool at a point to deliver said source of fluid under pressure to said imperforate surface of said solid portion of said workpiece..Iaddend. .Iadd.30. The invention as defined in claim 29 wherein said hole making means comprises a drill point and said means defining a fluid passageway opens outwardly of said tool adjacent said drill point for delivering fluid under pressure into said hole in said workpiece..Iaddend. .Iadd.31. A hole making and threading tool comprising: an elongated straight body having a shank at one end; a hole making means having an axis of rotation at an opposite end for making a hole in an imperforate surface of a solid portion of a workpiece, said hole having a wall; and a thread making means intermediate said one end and said opposite end of said elongated straight body; said thread making means having a maximum diameter no greater than the maximum diameter of said hole making means whereby said thread making means enters said hole without interference with said wall of said hole to thereafter form threads in said wall of said hole in said imperforate surface of said solid portion of said workpiece..Iaddend. .Iadd.32. A hole making and threading tool for use in a machine tool which is adapted to rotate a cutting tool about its axis and feed said cutting tool axially for cutting a hole having a wall in an imperforate surface of a solid portion of a workpiece and adapted to simultaneously rotate said cutting tool about said axis, move said axis in an orbital path and move said cutting tool axially whereby a point on said cutting tool defines a helical path, said hole making and threading tool comprising:   an elongated straight body having a shank at one end, a hole making means for making a hole in said imperforate surface of said solid portion of said workpiece at the other end and a thread making means intermediate said one end and said other end; and   said thread making means having a maximum diameter which is no greater than said maximum diameter of said hole making means whereby said thread making means can enter said hole made by said hole making means without interference with said wall of said hole to thereafter form threads in   
     
     
        said wall of said hole in said workpiece..Iaddend. .Iadd.33.  The invention as defined in claim 32 wherein said hole making means is a drill form..Iaddend. .Iadd.34. The invention as defined in claim 32 wherein said thread making means is a thread-form mill..Iaddend. .Iadd.35. The invention as defined in claim 32 wherein said hole making means is a drill form and said thread making means is a thread-form mill..Iaddend. .Iadd.36. The invention as defined in claim 32 wherein said hole making means comprises a drill point, and said thread making means comprises a thread-form mill having a plurality of thread cutters..Iaddend. .Iadd.37. The invention as defined in claim 32 wherein said thread making means is a thread-form mill for making female threads having a minimum diameter no smaller than the diameter of said hole..Iaddend. .Iadd.38. The invention as defined in claim 32 wherein said maximum diameter of said thread making means is a uniform diameter..Iaddend. .Iadd.39. In combination with a machine tool of the type having a spindle adapted to simultaneously rotate a cutting tool about its axis and feed said cutting tool axially for cutting a hole in an imperforate surface of a solid portion of a workpiece and thereafter concurrently move said axis in an orbital path and axially whereby a point on said cutting tool defines a helical path, the improvement comprising a hole making and threading tool having: an elongated straight body having a shank at one end; a hole making means at the other end for making said hole in said imperforate surface of said solid portion of said workpiece, said hole having a wall; and a thread making means intermediate said one end and said other end;   at least one chip removal passage extending from said hole making means through said thread making means; and   said thread making means having a maximum diameter which is no greater than the maximum diameter of said hole making means whereby said thread making means can enter said hole made by said hole making means in said imperforate surface of said solid portion of said workpiece without interference with said wall of said hole to thereafter form a thread in   
     
     
        said wall..Iaddend. .Iadd.40.  The combination as defined in claim 39 further comprising means for moving said hole making means along said axis such that said hole making means forms said hole in said imperforate surface of said solid portion of said workpiece while said thread making means enters said hole without interference with said wall in said hole; and means for moving said tool axially along said axis of said tool concurrently with moving said axis in an orbital path such that as said tool moves axially and orbitally helical threads are formed in said wall of said hole in said workpiece..Iaddend. .Iadd.41. The combination as defined in claim 39 wherein said hole making means is a drill form..Iaddend. .Iadd.42. The combination as defined in claim 41 further comprising means for moving said drill form along said axis such that said drill form forms said hole in said imperforate surface of said solid portion of said workpiece while said thread making means enters said hole without interference with said wall in said hole; and means for moving said tool axially along said axis of said tool concurrently with moving said axis in an orbital path such that as said tool moves axially and orbitally helical threads are formed in said wall of said hole in said workpiece..Iaddend. .Iadd.43. The combination as defined in claim 39 wherein said thread making means is a thread-form mill..Iaddend. 
     
     
        .Iadd.     The combination as defined in claim 43 further comprising means for moving said tool axially along said axis of said tool concurrently with moving said axis in an orbital path such that as said tool moves axially and orbitally, said thread-form mill forms helical threads in said hole; and means for moving said hole making means along said axis such that said hole making means forms a hole in said imperforate surface of said solid portion of said workpiece while said thread making means enters said hole without interference with said wall of said hole..Iaddend. .Iadd.45. The combination as defined in claim 39 wherein said hole making means is a drill form and said thread making means is a thread-form mill..Iaddend. .Iadd.46. The combination as defined in claim 45 further comprising means for moving said drill form along said axis such that said drill form forms a hole in said imperforate surface of said solid portion of said workpiece while said thread making enters said hole without interference with said wall of said hole; and means for moving said tool axially along said axis of said tool concurrently with moving said axis in an orbital path such that as said tool moves axially and orbitally, said thread-form mill forms helical threads in said wall of said hole in said workpiece..Iaddend. .Iadd.47. The combination as defined in claim 39 wherein said hole making means is a hole cutter and wherein said thread making means is an axially extending thread-form mill..Iaddend. .Iadd.48. The combination as defined in claim 47 further comprising means for moving said tool along said axis such that said hole cutter forms a hole in said imperforate surface of said solid portion of said workpiece while said thread making means enters said hole without interference with said wall of said hole; and means for moving said tool axially along said axis of said tool concurrently with moving said axis in an orbital path such that as said tool moves axially and orbitally, said thread-form mill forms helical threads in said wall of said hole in said workpiece..Iaddend. 
     
     
        .Iadd.49.  The combination as defined in claim 47 wherein said hole cutter comprises a drill point form..Iaddend. .Iadd.50. The combination as defined in claim 49 further comprising means for moving said tool along said axis such that said drill point form forms a hole in said imperforate surface of said solid portion of said workpiece while said thread-form mill enters said hole without interference with said wall of said hole; and means for moving said tool axially along said axis of said tool concurrently with moving said axis in an orbital path such that as said tool moves axially and orbitally, said thread-form mill forms helical threads in said wall of said hole in said workpiece..Iaddend. .Iadd.51. In combination with a machine tool of the type having a spindle adapted to be engaged for rotation and manipulation of a cutting tool, the improvement comprising a hole making said threading tool having: a shank having one end portion, an opposite end portion and an intermediate portion therebetween, said one end portion being adapted to be engaged for rotation and manipulation, said opposite end portion having hole making means for making a hole having a wall as said tool is rotated and manipulated longitudinally into an imperforate surface of a solid portion of a workpiece, said hole making means having an axis of rotation and a maximum diameter;   at least one longitudinally extending flute on said shank; and   thread cutting means located on said intermediate portion of said shank for cutting a thread in said wall of said hole in said imperforate surface of said solid portion of said workpiece, said thread cutting means having a maximum diameter no greater than said maximum diameter of said hole making means whereby said thread cutting means can enter said hole made by said hole making means in said imperforate surface of said solid portion of said workpiece without interference with said wall of said hole to   
     
     
        thereafter form a thread in said wall..Iaddend. .Iadd.52.  The combination as defined in claim 51 further comprising: means for rotating said tool;   means for moving said hole making means along said axis of rotation such that said hole making means forms a hole in said imperforate surface of said solid portion of said workpiece while said thread cutting means enters said hole without interference with said wall of said hole; and   means for concurrently moving said tool axially along said axis of rotation and orbitally around said axis of rotation such that as said tool moves axially and orbitally helical threads are formed in said wall of said hole in said workpiece..Iaddend. .Iadd.53. The combination as defined in claim 51 further comprising a plurality of flutes and wherein said tool is symmetrical about a longitudinal axis and the longitudinal center of mass substantially coincides with such longitudinal axis..Iaddend. .Iadd.54. The combination as defined in claim 53 further comprising means for moving said hole making means along said axis of rotation such that said hole making means forms a hole in said imperforate surface of said solid portion of said workpiece while said thread cutting means enters said hole without interference with said wall of said hole;   means for rotating said tool; and   means for concurrently moving said tool axially along said axis of rotation and orbitally around said axis of rotation such that as said tool moves axially and orbitally helical threads are formed in said wall of said hole in said workpiece..Iaddend. .Iadd.55. The combination as defined in claim 51 further comprising means defining a fluid passageway extending axially within said tool for communication at said one end portion with a source of fluid under pressure and opening outwardly of said tool at a point to deliver said source of fluid under pressure to said imperforate surface of   
     
     
        said solid portion of said workpiece..Iaddend. .Iadd.56.  The combination as defined in claim 55 further comprising means for moving said hole making means along said axis of rotation said that said hole making means forms a hole in said imperforate surface of said solid portion of said workpiece while said thread cutting means enters said hole without interference with said wall of said hole; means for rotating said tool; and   means for concurrently moving said tool axially along said axis of rotation and orbitally around said axis of rotation such that as said tool moves axially and orbitally helical threads are formed in said wall of said hole in said workpiece..Iaddend. .Iadd.57. The combination as defined in claim 55 wherein said hole making means comprises a drill point and said means defining a fluid passageway opens outwardly of said tool adjacent said drill point for delivering fluid under pressure into said hole in said workpiece..Iaddend. .Iadd.58. The combination as defined in claim 57 further comprising means for moving said drill point along said axis of rotation such that said drill point forms a hole in said imperforate surface of said solid portion of said workpiece while said thread cutting means enters said hole without interference with said wall of said hole;   means for rotating said tool; and   means for concurrently moving said tool axially along said axis of rotation and orbitally around said axis of rotation such that as said tool moves axially and orbitally helical threads are formed in said wall of said hole in said workpiece..Iaddend.