3150) Hmm ... the drawing gives more information than the photo does. >
> It looks like a repeating stroke center punch with a replaceable
> tip. Turn the crank and it both rotates the punch and strikes
> it by raising the weight (7) and dropping it (assisted by the
> spring) multiple times per rotation.
>
> The teeth on the spur gear, and the worm gear have a buttress
> tooth formation, allowing it to raise and then drop the weight
> once or more per crank rotation (depending on how many starts
> the thread of the worm has) -- and it looks like the point is
> rotated about once per three turns of the crank.
>
> if the point had a drill bit shape, it would be sort of like a
> manual hammer drill, but the point looks purely conical.
Good descripti
Rob