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Bell-Crank Vibrating Beater Churn: Beaters Rocked on Hung Fulcrums by a Cranked Shaft
Rhodes improved "the common churn" by the way he worked and hung its beaters.
Clarkson Rhodes of Morrow, Ohio, received US 8,959, dated 18 May 1852, for a churn box whose top has a convex recess for the cranks to pass, ventilated by a perforated tin plate over a hole "some 3/4 or an inch in diameter." A shaft bent into a double bell crank turns across the top; rods from the shaft carry the fulcrum on which the beaters vibrate, and rods from the cranks give them "an alternate up and down motion." The internal work lifts out with the top for cleaning.
This rung works out the beaters' swing, then prints the beaters and fulcrum hangers, bends the cranked shaft, and makes butter.
Intermediate
About 4 hours, plus printing
Instructions
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1
The beaters' swing
The beaters' swing
Loading Jupyter Notebook...
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2
A double crank working the beaters before it
A double crank working the beaters before it
The embedded blueprint swings an upright dasher from a double crank. Rhodes rocks beaters on fulcrums hung from the cranked shaft itself.
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3
Read US 8,959
Read US 8,959
"The shaft 1, 1, is turned by crank c, of which works the cranks 5, 5, and rods 3, 3, 3, 3 which gives the beaters or dashers 4, 4, 4, 4, an alternate up and down motion, and thereby causing an effectual churning of the milk."
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4
Print the parts
Print the parts
Print four beaters (/uploads/blueprints/bell-crank-vibrating-beater-churn-beater.stl) and two fulcrum hangers (/uploads/blueprints/bell-crank-vibrating-beater-churn-fulcrum-hanger.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
The cranked shaft
The cranked shaft
Bend a 6 mm steel rod into a shaft with two cranks of about 25 mm throw, pointing opposite ways, and a handle at one end. Lay it in notches in the ends of a food-safe box about 230 × 150 × 200 mm, under a plywood lid with a raised recess for the cranks and a small hole covered with perforated stainless sheet for air.
Materials for this step:
Mild Steel Rod1 piece
Food-Grade Storage Container1 piece
Plywood Sheet1 piece
Stainless Steel Sheet - 3041 pieceTools needed:
Adjustable Spanner
Hacksaw
Coping Saw
Tin Snips6
6
Hang the beaters
Hang the beaters
Hang each fulcrum hanger from the shaft beside a crank, on a loop of steel wire, and pin two beaters crossed on each hanger's lower hole. Join each beater's end to the nearer crank with a wire rod, eyes at both ends.
Materials for this step:
Spring Steel Wire1 piece
Machine Screws1 piece
Hex Nut1 pieceTools needed:
Adjustable Spanner
Screwdriver Set7
7
The build in 3D
The build in 3D
FreeCAD model of this build, not of the patent: the box with one side off to show the cranked shaft across the top, the rods hanging to the fulcrums, the crossed beaters and the crank rods.
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8
Crank and make butter
Crank and make butter
Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 2 litres. Fit the lid and turn the handle steadily; time until the butter comes. 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 Cream2000 ml
Coarse Sea Salt1 piece
Water1 pieceTools needed:
Leave-In Probe Thermometer
Stopwatch
Digital Kitchen Scale
Stainless Steel Mixing Bowl (Large)9
9
Beaters that jam, rods that bend
Beaters that jam, rods that bend
Bell-crank beater troubleshooting.
Flow
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10
History and honest limits
History and honest limits
**Clarkson Rhodes** of Morrow, Warren County, Ohio, received US 8,959, dated 18 May 1852 (the drawing sheet is lettered "G. Rhodes"; the specification gives Clarkson). He did not confine himself to the number or form of the dashers. He claimed the beaters hung by rods from the shaft on a fulcrum and worked by the rods and bell cranks.
**Honest limits.** A food-safe box, steel rod and printed beaters stand in 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
11- 1 piecePlaceholder
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- 2000 mlPlaceholder
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Tools Required
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Design Files
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