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Double-Concave Perforated Disk Dasher: Two Tin Domes With Half-Covered Holes
Marsh improved the dasher of "the plain old-fashioned churns so long used by farmers generally."
Joseph Marsh of Petersburg, Menard County, Illinois, received US 7,527, dated 30 July 1850, for a "double-concave perforated discoid churn-dasher": two convex pieces of tin or other suitable material, "perforated and placed on the upright," about six inches across with holes about three-quarters of an inch, "the several holes in B made to cover about half of the several holes in C." It works in a straight-sided churn by raising and pushing it, or by a lever.
This rung works out the open area, then prints the two domes and spacer, fits them to a staff, and makes butter.
Beginner
About 1 hour, plus printing
Instructions
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Half-covered holes
Half-covered holes
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An improved common dasher before it
An improved common dasher before it
The embedded blueprint improves the common dasher with pitched oars. Marsh uses two perforated domes whose holes half overlap.
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Read US 7,527
Read US 7,527
"The convex pieces of tin, as shown at B and C, are or may be six inches in diameter, and the several holes in the same about three-quarters of an inch in diameter, the several holes in B made to cover about half of the several holes in C."
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Print the domes
Print the domes
Print the two domes (/uploads/blueprints/double-concave-perforated-disk-dasher-disk-a.stl and /uploads/blueprints/double-concave-perforated-disk-dasher-disk-b.stl): 152 mm across with 19 mm holes, the second turned so its holes half cover the first's. Print the spacer ring (/uploads/blueprints/double-concave-perforated-disk-dasher-ring.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.
Materials for this step:
PETG Filament1 pieceTools needed:
FDM 3D Printer5
5
Assemble
Assemble
Glue the two domes back to back on the spacer ring, convex sides out, holes half overlapping, and glue them on the foot of a 12 mm hardwood dowel staff.
Materials for this step:
Hardwood Dowels1 piece
Two-Part Epoxy1 pieceTools needed:
Hand Saw
Sandpaper6
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The churn
The churn
Use a straight-sided food-grade container about 160 mm across and 300 mm tall, so the dasher fits closely without rubbing, as he said. Drill its lid for the staff.
Materials for this step:
Food-Grade Storage Container1 pieceTools needed:
Cordless Drill
Hole Saw Kit7
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The build in 3D
The build in 3D
FreeCAD model of this build, not of the patent: the straight-sided churn cut away to show the two perforated domes back to back on the staff, and a lever.
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Dash and make butter
Dash and make butter
Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 2 litres. Work the staff up and down; 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
A dasher that sticks or splashes
A dasher that sticks or splashes
Double-concave disk dasher troubleshooting.
Flow
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History and honest limits
History and honest limits
**Joseph Marsh** of Petersburg, Menard County, Illinois, received US 7,527, dated 30 July 1850. He wrote that it creates "a suction of atmosphere through the milk ... that excels any improvement in churns of ancient or modern invention"; that is his claim. His churn was straight inside "instead of cone-shaped." He claimed the double-concave perforated discoid churn-dasher.
**Honest limits.** Printed domes stand in for his tin. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.
Materials
7- 1 piecePlaceholder
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- 2000 mlPlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
Tools Required
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- 1 vendor sell this, none ship to you yetPlaceholder
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Design Files
1Related Blueprints
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