So last week, when i got an oppotunity to try some woodturning I desided that my first ever woorturning-project, was to be a so-called "pump-drill".
Although I don't have any sources of these drills being used in medieval times, I can only think that they must have had them...
The mecanism that rotates the drill is very simple and has been used for at least a couple of hundred years, by all sorts of craftsmen (namely goldsmiths).
I haven't made the drill-bits, for the pump-drill yet. But photos of these will follow as soon as I figure out how to make them... Along with a demonstration!
The drill is made from oak-wood and norwegian soapstone.
The soapstone fly-wheel makes the drill rotate steadily and wind up the cords that spins the shaft of the drill.
The cord is mounted on both ends of the "cross-bar" (?) by a knot tied to a small nail.
At the top of the shaft the cord passes through a hole. This makes sure that the cord is equally long on both ends of the "cross-bar".
6 comments:
It looks really beautiful. Simple but beautiful. I´ve never tried woodturning in oak and I sort of thought it would be hard to get a nice smooth surface of the finished object, but you seem to have got it right.
Good luck with the drill-bits.
/Frej
Oak is a bitch ;-)
The drill got a lot of small fractures. Nothing that compromises the stability, but it doesn't look that good.
Maybe it isn't that clear on the pictures... but unfortunately they are there...
Next time i will try Elderberry-wood instead!
I agree with Frej.. It's beautiful in its simplicity!
Have you looked at the tools in the Mästermyr chest?
http://mis.historiska.se/mis/sok/resultat_foremal.asp?lokalid=39216&sort=ASC&orderby=lokal_&qtype=f&search=1
http://www.netlabs.net/~osan/Mastermyr/ImageLib.html
There are drills (Swe: borr) and drillbits in there.
Thanks for the links Lia! Those are som great pictures!
If I could one day own copies of all those lovely tools... I would surely be one happy guy :-)
Even though there are drills in the Mästermyr-chest i don't think that they are suitable for a pump-drill. The type of drills ("Augers" or "spoon-drills") found in the Mästermyr-chest are augers and I believe the require a more sturdy handle. As they are rotated by hand.
The drill-bits for the pump-drill are smaller and the bit is almost always flat.
The tips of the drills can then be either diamond-shaped or "crown"-shaped.
As can be seen in this reconstruction:
http://www.historiavivens1300.at/hv1300.htm
And here...
http://www.historiavivens1300.at/hv1300.htm
Nice work!
You wrote: "Although I don't have any sources of these drills being used in medieval times, (...)".
Well, here they are:
1425 http://www.nuernberger-hausbuecher.de/75-Amb-2-317-5-v "Hausbuch der Mendelschen Zwölfbrüderstiftung"
ca. 1280 http://www.beinschnitzer.de/biblio/spielebuch.jpg , ist from "Libro del Acedrex"
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