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| An idea for drill sharpening jig |
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| sorveltaja:
When looking properly sharpened drill bit's grinded surface from the side, instead of being flat, it seems to have some kind of thread-like pitch in it. Maybe an old idea, but for example, piece of trapezoid or similar flat-threaded would act as a 'jig'. Comparison between metric drill bit, and thread. Pitch is about 4,65 mm. My lathe's highest(or is it lowest?) metric pitch is only 1,5 mm, so I probably have to hunt some surplus clamp or vice, that has at least 4,5 mm pitch screw in it, to see in practise, if that idea is any good. |
| DICKEYBIRD:
That's a pretty brilliant idea! All we need is a CNC ballscrew with the 4.5 mm pitch and give it a whirl. :proj: :ddb: ps: What CAD program did you use to draw the pic? Beautiful work! |
| sorveltaja:
An evaluation version of Rhino 3D is used. Although it has limited save times, it's possible to make small demonstrations with it ::). |
| John Hill:
Now that is interesting, I suppose one could mount a tool post grinder, set up an appropriate thread pitch and carefully hand turn the spindle half a turn to grind one flute, then, somehow :scratch: set it up to grind the other flute. |
| sorveltaja:
Another idea how to make pitch adjustable. Red part is a spring, and blue one adjusts its axial length, and its pitch also: Next thing would be to add part, that follows spring's pitch. I haven't yet discovered how to achieve that. |
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