Opposed-Blade Cone Butter Worker: Blades Lift and Press the Butter in a Cone, Buttermilk Drains Below

"By subjecting the butter to the rolling and compressing action as described, its grain or molecules will not be broken, for it is not subjected to a direct pressure, the working of the butter resembling that given or produced by hand."

Print the bottom plate (/uploads/blueprints/opposed-blade-cone-butter-worker-bottom-plate.stl), the lower blades (/uploads/blueprints/opposed-blade-cone-butter-worker-lower-blades.stl) and the upper blades (/uploads/blueprints/opposed-blade-cone-butter-worker-upper-blades.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Use a tapered food-grade bucket as the case, cut a hole in its bottom and seal the bottom plate over it with food-safe silicone. Hang the bucket in a pine frame on two bolts through its sides, as his pivots, so it can be tipped to empty.

Stand a 10 mm square hardwood shaft in the plate's step, cut a groove up one side of its foot for the buttermilk, push on the lower blades and, above them, the upper blades, and fit a crank on top through a pine bar across the bucket's mouth.

US 19,103 drawing sheet, public domain (expired patent).

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Churn 1.5 litres in any churn and drain the butter. Set a bowl under the worker, put the butter in and turn the crank steadily; the buttermilk runs out through the plate. Add a pinch of salt and turn on to work it in. Tip the case to empty it and weigh the butter.

**Justin M. Smith** of Lyme, New London County, Connecticut, US 19,103, 12 January 1858. He wrote that the blades mix the salt through evenly and carry off hardened buttermilk; those are his claims. He did not claim a rotating shaft with arms in a case broadly; he claimed the shaft with its arms in the suspended inverted conical case with the perforated plate. A bucket and printed parts stand in for his wooden case. FDM prints hold food in their layer lines, so wash well and replace when worn.