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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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grinding drills
Background:
A long time ago I bought two bench grinders from Grainger. They are 8 inch belt driven grinders. And I like them because they are slimmer than ones with a motor between the two wheels. And i also like the size. 6 inch wheels seem to be a little small. I also have a 10 inch grinder so I am not lacking for grinders. The 10 inch one has two regular wheels. One of the 8 inch ones has a wire brush and a abrasive cut off wheel. And I just made another stand and plan on that 8 inch grinder having a fine wheel and a rubber contact wheel that uses sanding belts. I have had a General drill sharpener fixture for ages and decided to figure out a way to use it with the fine wheel on the 8 inch grinder. So I was rooting around on the internet looking for instructions for the General fixture and ran across several videos of how to grind drill bits by hand. I can grind drills by hand if they are not too small. I taught myself. Anyway I watched a couple of the videos and saw that the videos show a somewhat different way to sharpen drills. When I sharpen drills I start grinding on the heal and finish at the cutting edge. Both videos showed the grinding starting at the cutting edge and ending up grinding the heal. So I am curious how most people grind drills by hand. I mounted the General fixture a bit different from the instructions. It is rotated 90 degrees from the usual position and the cutting is done on the outside of the wheel. So the drill is in about the same position as it would be if sharpening by hand. Somehow grinding on the side of the wheel seems wrong. This does have the advantage that any grind marks are perpendicular to the cutting edge. Not really a big deal as fine stone is 100 grit and the grind marks are pretty much invisible. The big advantage is that the fixture stays on the adapter I made and the adapter mounts quickly in place of the tool rests using wind nuts. So the fixture is not in the way, yet is easily put in place. Dan |
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