GB651663A - Improvements in and relating to fixtures for grinding twist drill tips - Google Patents

Improvements in and relating to fixtures for grinding twist drill tips

Info

Publication number
GB651663A
GB651663A GB15012/48A GB1501248A GB651663A GB 651663 A GB651663 A GB 651663A GB 15012/48 A GB15012/48 A GB 15012/48A GB 1501248 A GB1501248 A GB 1501248A GB 651663 A GB651663 A GB 651663A
Authority
GB
United Kingdom
Prior art keywords
tip
helical
grinding
body member
grinding wheel
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
Application number
GB15012/48A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB651663A publication Critical patent/GB651663A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/247—Supports for drills

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

651,663. Grinding tips for twist drills. BRITISH THOMSON-HOUSTON CO., Ltd. June 3, 1948, No. 15012. Convention date, June 4, 1947. [Class 60] [Also in Group XXII] In an apparatus for grinding a twist drill tip 35, Fig. 1, and of the kind in which a work-holding member 29 is caused to move helically in a body member 8 by a key cooperating with a helical groove, the workholding member has a front portion of semi-circular cross-section and is provided with a stop 31 to ensure that the helical movement is started from a position in which a plane surface of the member 29 is parallel with the surface of a table 2; a grinding wheel 1 is mounted with its axis parallel to this surface and perpendicular to that of the member 29. In the preferred embodiment, the member 29 has a number of helical grooves which differ in pitch and the key 19 may be engaged with any one of them by screwing it into one of a number of tapped holes in the body member 8 so that various sizes of tips may be treated. The plane surface of the member 29 is adapted to support the tip and is provided with a spring-loaded clamp 38, Fig. 3, for this purpose. The grinding wheel 1 comprises a straight portion 46, Fig. 2, and a curved portion 47 and the body member 8 is positioned so that the centre of a tip to be ground is in alignment with the juncture of these two portions. The table 2, which is reciprocable and provided with adjustable stops 4, 5, forms part of a conventional grinding machine and is provided with a magnetic chuck 7 to hold the body member 8. In operation, the member 29 is turned by means of a handle 30 until the stop 31 is in contact with the face of the chuck so that the tip is held parallel to the surface of the table 2 which is then reciprocated to grind a flat face 55, Fig. 8, on one side of the tip, the tip being reversed for similar treatment of the opposite side. The helical surfaces are ground with the stops 4, 5 in abutment, the handle 30 being turned to impart a helical motion to the tip while it is in contact with the curved portion of the grinding wheel.
GB15012/48A 1947-06-04 1948-06-03 Improvements in and relating to fixtures for grinding twist drill tips Expired GB651663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US651663XA 1947-06-04 1947-06-04

Publications (1)

Publication Number Publication Date
GB651663A true GB651663A (en) 1951-04-04

Family

ID=22060764

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15012/48A Expired GB651663A (en) 1947-06-04 1948-06-03 Improvements in and relating to fixtures for grinding twist drill tips

Country Status (1)

Country Link
GB (1) GB651663A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111571321A (en) * 2020-06-18 2020-08-25 常州豪爵铃木摩托车有限公司 Drill bit grinding equipment for drilling motorcycle frame

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111571321A (en) * 2020-06-18 2020-08-25 常州豪爵铃木摩托车有限公司 Drill bit grinding equipment for drilling motorcycle frame

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