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Thread: Sharpening a Countersink !
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4th August 2020, 04:20 AM #1Most Valued Member
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Sharpening a Countersink !
Hi Guys,
Quite some time ago I had a need to sharpen a countersink, Today I needed to sharpen another ! Back then I made a jig to hold the countersink while rotating it against the grinding wheel. Today I've modified the jig slightly in order to improve the grinding shape.
03-08-2020-06.jpg
This is the sort of countersink I've been sharpening. This one has just been ground using the jig.
03-08-2020-01.JPG
This is the setup. The sharpening jig is clamped to the grinder table at the correct angle, in this case 41 degrees.
03-08-2020-04.jpg 03-08-2020-03.jpg
The workpiece is held in a drill chuck and rotated through 360 degrees.
03-08-2020-05.JPG 03-08-2020-07.JPG 03-08-2020-08.jpg
It isn't always realised that the countersinks are not actually round but are tapered cones. The countersink is fed forward into the grinding wheel by a thread. In this case a 1.25 mm pitch screw moving the whole countersink, chuck and shaft forwards as the chuck is rotated.
This gives the countersink a smooth tapered cone and a sharp cutting edge. The cone providing relief behind the cutting edge in a similar manner to a lathe tool.
Attached Images
- 03-08-2020-01.JPG (110.1 KB)
- 03-08-2020-04.jpg (223.8 KB)
- 03-08-2020-03.jpg (239.5 KB)
- 03-08-2020-07.JPG (232.2 KB)
- 03-08-2020-06.jpg (246.8 KB)
- 03-08-2020-05.JPG (132.1 KB)
- 03-08-2020-08.jpg (166.9 KB)
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