I'm familiar with pump drills, but never seen one as a drill press. Anyone know anything about these?
https://www.youtube.com/watch?v=9D__A2gK2_o
I can't tell from this video how he got it to press/up/down.
Have you got one?
Ever seen one? Video/article?
Care to speculate if you haven't?
I have got to have one.
I learned to make these things for starting fires. I never knew they were used as woodworking implements.
The disk on the spindle (vertical shaft) has significant weight to it. The spindle is notched or drilled though near the top, where the midpoint of the cord is set, and attaches to the bow (horizontal plank) on either side.
The cord is then wound around the shaft manually. Once wound, pushing down on the bow causes the spindle to rotate. Due to the weight of the disk, the shaft keeps its momentum, and rewinds the cord around the shaft. The next push on the bow has the same effect as the first, but it the opposite rotational direction.
I expect that this type of drill would need a bit that is designed to cut in both directions of rotation. Very cool, thanks for sharing.