GB189274A - Improvements in tools for grinding twist drills - Google Patents
Improvements in tools for grinding twist drillsInfo
- Publication number
- GB189274A GB189274A GB2431921A GB2431921A GB189274A GB 189274 A GB189274 A GB 189274A GB 2431921 A GB2431921 A GB 2431921A GB 2431921 A GB2431921 A GB 2431921A GB 189274 A GB189274 A GB 189274A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drill
- groove
- axis
- sharpening
- support
- 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
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
189,274. Trier, F. N., (Kloetzli, T.). Sept. 13, 1921. Twist drills, sharpening.-Comprises a device for sharpening twist drills wherein the usual V-groove in which the drill is supported is of such a cross-section that drills of different diameters, on being placed in the groove, automatically take up the correct position for sharpening. The drill support E has a shank A adapted to be oscillated, during sharpening, in a socket B, which is adjustably secured to the base of the grinding-machine, the axis XW of the shank being inclined to the face of the grinding-wheel K to give the correct angle to the cutting-edges of the drill. The support E is of V-section with the sides XY, XZ inclined, as shown in Fig. 3, at such angles to the vertical plane containing the axis XW that that plane divides the base YZ of the triangle XYZ into parts approximately in the proportion of 2 to 1. By the use of a groove of this section the distance or offset of the centre of a drill from the axis XW varies according to the diameter of the drill. A lip rest D, which may be adjustable lengthways of the holder to vary the clearance on the drill point, is secured to the support, and a stop H for the end of the drill is adjustably mounted on the support. In a modification, the position of the V-groove is reversed relatively to the axis of oscillation. Reference has been directed by the Comptroller to Specifications 2704/00 and 9930/00.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2431921A GB189274A (en) | 1921-09-13 | 1921-09-13 | Improvements in tools for grinding twist drills |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2431921A GB189274A (en) | 1921-09-13 | 1921-09-13 | Improvements in tools for grinding twist drills |
Publications (1)
Publication Number | Publication Date |
---|---|
GB189274A true GB189274A (en) | 1922-11-30 |
Family
ID=10209816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2431921A Expired GB189274A (en) | 1921-09-13 | 1921-09-13 | Improvements in tools for grinding twist drills |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB189274A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3178857A (en) * | 1962-09-21 | 1965-04-20 | Grob & Tesker Corp | Drill grinding method and apparatus |
-
1921
- 1921-09-13 GB GB2431921A patent/GB189274A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3178857A (en) * | 1962-09-21 | 1965-04-20 | Grob & Tesker Corp | Drill grinding method and apparatus |
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