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Treacle was an old English word for medicine, and was also used to describe dark coloured undrinkable water, which from its foul palate was associated with the commonly held taste of medicine. Consequently a well where the water became undrinkable would be termed a âtreacle wellâ.
Trepanning Manufacturing Basics. Trepanning is a manufacturing process used to produce holes or circular grooves by using one or more cutters and revolving them around a center.Trepanning machining is used to produce the following features and parts: 1  Low volume disks from flat stock.2  Disks can be fabricated up to .25 (6.35mm) thick and 6 (152mm) in diameter. 3  Large diameter through holes in flat stock.repanning machining is used to produce the following features and parts: 1  Low volume disks from flat stock. 2  Large diameter through holes in flat stock. 3  Machining internal and external circular grooves or o-ring glands. 4  Deep holes 2 (50.8mm) or more in diameter.