No, that isn’t an accident. Some 1000 years ago, a Peruvian healer used a hand drill to make dozens of small holes in a patient’s skull.
Cranial surgery is tricky business, even under 21st-century conditions—with specialized surgical instruments and lots of pain medication…both during and afterward.
Healers in Peru practiced trepanation—a surgical procedure that involves removing a section of the cranial vault using a hand drill or a scraping tool—more than 1,000 years ago to treat a variety of ailments, from head injuries to heartsickness. And they did so without the benefit of the aforementioned medical advances.
Danielle Kurin, a UC Santa Barbara bioarchaeologist (and a specialist in forensic anthropology) explains:
“When you get a knock on the head that causes your brain to swell dangerously, or you have some kind of neurological, spiritual, or psychosomatic illness, drilling a hole in the head becomes a reasonable thing to do.”
Excavating burial caves in the south-central Andean province of Andahuaylas in Peru, Kurin and her research team unearthed the remains of 32 individuals that date back to the Late Intermediate Period (ca. 1000-1250 CE).
Among them, 45 separate trepanation procedures were in evidence. Kurin’s findings appear in the current issue of the American Journal of Physical Anthropology.
I needed to take it apart because the grease was so hard that it no longer served as a lubricant.
Also many parts were badly rusted and the soldered contacts were broken.
Taking it apart was pretty straight forward but the grease was hard to deal with (>_<;) I used a combination of heat, wire brushes and WD40 to remove the hardened grease. Heating it was not that nice though because it smelled awful ( ° ロ °)ノ
I think removing the grease took more time than all the other steps combined :D The old power cord just crumbled and made a mess so I need to look for a new one (I think I still have a suitable wire laying around :)
I got this hand drill as a gift :)
The fact that they have gone through the trouble of fixing a damaged casting by applying and evening out lead and the really old design of the switch (the contacts are not plated with anything so corrosion is a problem…) and the way the heads of the screws look this thing must be really old :D I have no idea how old it is exactly but judging by the way it is made I guess it is from the 1930s :) If one of you knows more about it feel free to write me (^^)
The gears looked really nice :3 They have really small teeth and the motor runs at about 6000rpm and is geared down to 2500 rpm on the chuck :)
I need to get or build a power supply for it as it is running on 42 V at a frequency of 50 Hz :D I cannot afford to buy the components right now so this might take a while since transformers are expensive (^-^;) I would feel quite uncomfortable plugging this thing into a 220 V (or even a 110 V) wall socket (°_°;) Aside from the original connector consisting of two separate plugs, the whole wiring on the inside is so close to the housing and so many parts actually touch the housing that it seems to be very far from being safe :D Running it on a transformer will make it a lot safer because of the galvanic isolation :)
I have no idea what I will use it for but I think it will work well as a drill for small drill bits and for starting precision holes :)
The thing I used to prop up the hand drill is actually something I made during my apprenticeship :) It was basically like an exam where I had to prove that I could use files and that I could use different ways to join pieces together (^-^) So this was made by hand using files, a hacksaw and a drill press :)