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Rotary-and-Vibrating Dasher Churn: Turn to Churn, Lift and Plunge to Gather
Nash wanted to switch from churning to gathering "without changing the connection of the machinery."
William R. Nash of Bridgeport, Connecticut, received US 7,348, dated 7 May 1850, for working rotary and vertical churn-dashers on one shaft. A rotary dasher of four radial hollow prismatic arms, each with a hole in its forward side near the shaft and an aperture in its rear side near its end, turns above a perforated vibrating dasher held between collars. The pinion on the lid drives the shaft by a pin in a notch, "but the shaft being free to slide vertically upward," the handle on top can work the vibrating dasher up and down.
This rung looks at the hollow arms, then prints both dashers and the notched pinion, fits them in a box, and makes butter.
Intermediate
About 4 hours, plus printing
Instructions
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Air through the arms
Air through the arms
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Rotary and reciprocating dashers on one spindle before it
Rotary and reciprocating dashers on one spindle before it
The embedded blueprint works both dashers at once from one crank. Nash uses them one after the other: rotary to churn, vibrating to gather.
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Read US 7,348
Read US 7,348
"The nature of this invention consists, principally in so arranging and combining in the same churn and upon one shaft, a horizontal rotary dasher and a vertically vibrating dasher, that while the rotary dasher is operated for the purpose of agitating the cream, the vibrating dasher remains at rest; and that when the butter is produced, the vibrating dasher may be operated for the purpose of gathering or consolidating the butter."
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Print the parts
Print the parts
Print the rotary dasher with its four hollow triangular arms (/uploads/blueprints/rotary-and-vibrating-dasher-churn-rotary-dasher.stl), the perforated vibrating dasher (/uploads/blueprints/rotary-and-vibrating-dasher-churn-vibrating-dasher.stl), the notched pinion (/uploads/blueprints/rotary-and-vibrating-dasher-churn-notched-pinion.stl) and the crank arm (/uploads/blueprints/rotary-and-vibrating-dasher-churn-crank-arm.stl). Print in PLA at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.
Materials for this step:
PLA Filament1 pieceTools needed:
FDM 3D Printer5
5
Shaft and dashers
Shaft and dashers
Use a 12 mm hardwood dowel as the shaft, squared where the rotary dasher sits. Glue two collars of short dowel on it either side of the vibrating dasher so it is carried up and down but turns freely, and glue the rotary dasher 30 mm above. Drill a cross hole for a steel pin just above where the pinion will sit, and fit a handle on top.
Materials for this step:
Hardwood Dowels1 piece
Mild Steel Rod1 piece
Wood Glue1 pieceTools needed:
Hand Saw
Cordless Drill
Drill Bit Set
Hacksaw6
6
Lid, pinion and crank
Lid, pinion and crank
Take a food-safe square box about 170 mm each way and cut a two-part plywood lid, one part removable. Seat the pinion on the lid round the shaft, the pin lying in its notch. Mount a crown wheel on a short crank shaft between two posts on the lid so its pegs mesh the pinion, as his gear wheel I, and fit the crank arm.
Materials for this step:
Food-Grade Storage Container1 piece
Plywood Sheet1 piece
Pine Board1 pieceHardwood Dowels1 piece
#8 x 1" Wood Screw1 pieceTools needed:
Coping SawCordless Drill
Screwdriver Set7
7
The build in 3D
The build in 3D
FreeCAD model of this build, not of the patent: the box cut away to show the perforated vibrating dasher at the shaft's foot, the rotary dasher of hollow arms above it, and the notched pinion on the lid.
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Churn by crank, gather by hand
Churn by crank, gather by hand
Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Turn the crank; time until the butter comes. Then work the handle up and down, so the vibrating dasher gathers the butter while the gearing rests. Pour off the buttermilk, add cold water, churn a little and pour off again until it runs clear; work in a pinch of salt and weigh the butter.
Materials for this step:
Heavy Cream1500 ml
Coarse Sea Salt1 piece
Water1 pieceTools needed:
Leave-In Probe Thermometer
Stopwatch
Digital Kitchen Scale
Stainless Steel Mixing Bowl (Large)9
9
A pin that jumps, a dasher that turns
A pin that jumps, a dasher that turns
Rotary-and-vibrating dasher troubleshooting.
Flow
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History and honest limits
History and honest limits
**William R. Nash** of Bridgeport, Fairfield County, Connecticut, received US 7,348, dated 7 May 1850. His lid was in two parts so one could be removed "without disturbing" the other; "one or more additional rotary dashers, may be attached to the vertical shaft." He claimed the application of the shaft to give a vertical reciprocating movement to the vibrating dasher and a rotary one to the others, so either can be used.
**Honest limits.** A pegged crown wheel and pinion stand in for his gear wheel and pinion; a food-safe box and printed dashers for his. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.
Materials
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Tools Required
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Design Files
1Related Blueprints
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Whirl-Frame Air Dasher Churn: Free Wheels Spun by the Milk Inside a Revolving Frame
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Hollow-Arm Air Churn: A Spinning Dasher That Breathes Air Into the Cream
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CC0 Public Domain
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