Spent a few hours at the Old Schwamb Mill, a 1860s vintage turning shop with half a dozen oval turning lathes. They were used to turn oval picture and mirror frames. The largest one can turn a frame 6 foot on its longest axis and can have a shorter axis as extreme as 30 inches shorter than longest.
The big lathe is incorporated into the structure of the building and was originally water powered. All the equipment runs off of leather belts.
Back in the late 19th century they would turn out 100,000 oval frames a year on 5 or 6 lathes. That's around 10 minutes per frame on the lathe! Pretty quick for old world manufacturing.
The big lathe is incorporated into the structure of the building and was originally water powered. All the equipment runs off of leather belts.
Back in the late 19th century they would turn out 100,000 oval frames a year on 5 or 6 lathes. That's around 10 minutes per frame on the lathe! Pretty quick for old world manufacturing.