Sometimes we stumble into things while looking for other things. This morning I was researching more on taps for threading nuts and came across an interesting image from Das Mittelalterlich Hausbuch von Schloss Wolfegg. Hausbuchs were common record keeping documents of the activities and operations of the households of the nobility and wealthy merchant class in the late Medieval and Renaissance Germanies. I’ve pulled quite a bit from the Zweibruder house book in other tool research.
The Wolfegg housebook (dated 1480) has a rather intriguing set of devices on folio 53.
The two items at the top of the page are attributed to be a screw-cutting lathe and cutter. I’m going to noodle about to figure out how the cutter actually mounts to the lathe and operates. The object at the bottom of the page casts a disappointing light on the viability of trusting the English translation of this book. According to the translation, that item is a scale. Anyone with the slightest familiarity with engineering can see this is not a scale, but a angle(bevel) gauge for spotting elevation. Some might refer to this as a “Military Sector,” as used for measuring the elevation and range of early gunpowder artillery.
I may need more thick boards in the near future.