GB563546A - Improvements relating to jigs for use in grinding drill bits - Google Patents
Improvements relating to jigs for use in grinding drill bitsInfo
- Publication number
- GB563546A GB563546A GB442543A GB442543A GB563546A GB 563546 A GB563546 A GB 563546A GB 442543 A GB442543 A GB 442543A GB 442543 A GB442543 A GB 442543A GB 563546 A GB563546 A GB 563546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- faces
- bit
- jig
- grinding
- face
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/066—Work supports, e.g. adjustable steadies adapted for supporting work in the form of tools, e.g. drills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
563,546. Grinding drill bits. CROFTON & CO. (ENGINEERS), Ltd., C., WILES, R. C., and CAMERON, A. March 18, 1943, No. 4425. [Class 60] In grinding the backing-off of rotary drill bits used for drilling coal, rock, &c., for example, as shown, having two blades or wings tipped with tungsten carbide &c. h with two outer cutting faces 1, 2 and two inner cutting faces 3, 4, all of which have to be backed off, a jig a is employed comprising a block of brass, plastic material, &c. in the face o of which is a twolobed recess f and a central hole, and which has two inclined side faces m, n, the angle of inclination of the faces to a plane at right angles to the axis of the central hole corresponding to the backing-off angle of the bit b. The recess f receives the base of the wings of the bit, as shown in dotted lines in Fig. 1, and the shank d of the bit is held in the central hole in the block by a screwed stem and handle c. In use, the jig is laid on one of its inclined faces upon the table t at the right-hand side, or upon the table t<1> at.the left-hand side of a grinding- wheel g, the stem c serving for moving the jig back and forth over the table with the bit in contact with the wheel g. Face 1 is ground first and the jig is then turned over and laid upon table t<1> to grind the face 3 ; faces 2 and 4 are ground by releasing the bit and turning it 180 degrees in the jig and re-clamping, or may be ground without releasing the bit by setting the jig with the stem projecting in the opposite direction, as in Fig. 6. The tables t, t<1> may have sight lines thereon, parallel to the faces of the wheel g, to assist in guiding the jig ; end faces of the jig also may be inclined for grinding other faces of the bit, corresponding holes being provided for the screwed stem c. A gauge plate may be provided, having various forms for checking the face angles of a bit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB442543A GB563546A (en) | 1943-03-18 | 1943-03-18 | Improvements relating to jigs for use in grinding drill bits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB442543A GB563546A (en) | 1943-03-18 | 1943-03-18 | Improvements relating to jigs for use in grinding drill bits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB563546A true GB563546A (en) | 1944-08-18 |
Family
ID=9776949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB442543A Expired GB563546A (en) | 1943-03-18 | 1943-03-18 | Improvements relating to jigs for use in grinding drill bits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB563546A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3338910A1 (en) * | 1983-10-27 | 1985-05-09 | Robert 5446 Engeln Wolff | AUXILIARY DEVICE FOR GRINDING SPIRAL DRILLS |
US5358761A (en) * | 1988-05-07 | 1994-10-25 | Mcdonald George W | Folded sheet |
-
1943
- 1943-03-18 GB GB442543A patent/GB563546A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3338910A1 (en) * | 1983-10-27 | 1985-05-09 | Robert 5446 Engeln Wolff | AUXILIARY DEVICE FOR GRINDING SPIRAL DRILLS |
US4566227A (en) * | 1983-10-27 | 1986-01-28 | Robert Wolff | Auxiliary device for re-grinding of spiral drills |
US5358761A (en) * | 1988-05-07 | 1994-10-25 | Mcdonald George W | Folded sheet |
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