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Trapped-Air Cylinder Dash Churn: A Hollow Dash That Squeezes Air Into the Cream
Charles Murdock, Baltimore, Maryland · Public domain (expired patent)
Emma

Nilikha ni

Emma

6. Oktubre 2026SE
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Trapped-Air Cylinder Dash Churn: A Hollow Dash That Squeezes Air Into the Cream

Murdock wanted the air carried down through the cream by the common up-and-down dash itself. Charles Murdock of Baltimore, Maryland, received US 6,133, dated 20 February 1849, for "Murdock's Atmospheric Churn": a hollow cylindrical dash, perforated round its lower open end, on the common dash staff, which is bored to slide over a fixed central spindle. The spindle stands in a stationary cylindrical block, smaller than the dash, held to the churn's bottom by a nut. At each stroke the dash fills with air above the cream, carries it down, and when it meets the block the air "is compressed in the cylinder forced radially through the apertures." This rung works out the air squeezed out each stroke, then prints the dash and block, fits them to a churn, and makes butter.
Baguhan
About 2 hours, plus printing

Mga Tagubilin

1

Air per stroke

Naglo-load ng Jupyter notebook…
2

An air pump in the churn before it

The embedded blueprint puts a pump and a ring dasher in the churn. Murdock makes the dash itself the pump.
3

Read US 6,133

"The air, however, may be let into the cylinder through a valve in its top or side instead of open end which will do away with the necessity of raising the cylinder above the surface of the cream to receive air. The aperture in the staff must be a little larger than the spindle but must not extend through it nor be intersected by any lateral opening."
4

Print the dash and block

Print the dash open end up (/uploads/blueprints/trapped-air-cylinder-dash-churn-dash.stl): a 90 mm cylinder with sixteen small holes near its open edge and a socket for the staff. Print the block (/uploads/blueprints/trapped-air-cylinder-dash-churn-block.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Mga materyales para sa hakbang na ito:

PETG filamentPETG filament1 piraso

Mga kailangang kasangkapan:

Limbagang 3D na FDMLimbagang 3D na FDM
5

Spindle and block

Drill an 8 mm hole in the centre of a tall food-grade bucket's floor. Pass an M8 threaded rod up through it and the block, with a washer and nut under the floor and silicone round the hole, so the rod stands upright as the spindle.

Mga materyales para sa hakbang na ito:

Balde na 20 LitroBalde na 20 Litro1 piraso
Baras na may sinulidBaras na may sinulid1 piraso
Tuerkang HeksagonalTuerkang Heksagonal1 piraso
Patag na SinturonPatag na Sinturon1 piraso
Silicone SealantSilicone Sealant1 piraso

Mga kailangang kasangkapan:

Walang-Kableng BarenaWalang-Kableng Barena
Hanay ng Talim ng BarenaHanay ng Talim ng Barena
Llaveng inglesLlaveng ingles
Lagaring Pang-metalLagaring Pang-metal
6

Staff and lid

Bore a 25 mm hardwood dowel lengthwise, 10 mm, deep enough to slide over the spindle's full height but not through its top, and glue the dash on its foot. Drill the lid for the staff and fit a knob on top.

Mga materyales para sa hakbang na ito:

Mga tarugong matigas na kahoyMga tarugong matigas na kahoy1 piraso
Tipak ng Matigas na KahoyTipak ng Matigas na Kahoy1 piraso
Pandikit sa KahoyPandikit sa Kahoy1 piraso

Mga kailangang kasangkapan:

Walang-Kableng BarenaWalang-Kableng Barena
Hanay ng Talim ng BarenaHanay ng Talim ng Barena
Lagaring PangkamayLagaring Pangkamay
Papel de LihaPapel de Liha
7

The build in 3D

FreeCAD model of this build, not of the patent: the churn and dash cut away to show the hollow dash with its holes near the open end, the bored staff over the fixed spindle, and the stationary block it closes over.
File ng DisenyoBLENDCC0 - Free
I-download ang modelo
8

Dash and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Work the staff up and down, lifting the dash above the cream each time to fill it with air; bubbles burst from the holes at the foot of each stroke. 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.
Hakbang 8 - Image 1

Mga materyales para sa hakbang na ito:

Makapal na kremaMakapal na krema1500 ml
Magaspang na Asin sa DagatMagaspang na Asin sa Dagat1 piraso
TubigTubig1 piraso

Mga kailangang kasangkapan:

Termometro na naiiwang nakatusokTermometro na naiiwang nakatusok
Panukat ng OrasPanukat ng Oras
Digital na Timbangang PangkusinaDigital na Timbangang Pangkusina
Malaking mangkok na panghalo na asero na hindi kinakalawangMalaking mangkok na panghalo na asero na hindi kinakalawang
9

No bubbles, a staff that sticks

Trapped-air cylinder dash churn troubleshooting.

Flow

Loading...
10

History and honest limits

**Charles Murdock** of Baltimore, Maryland, received US 6,133, dated 20 February 1849, signed 21 November 1848. The dash could be formed in the underside of the dash block, or as a cylinder fixed to the dash's periphery; in a stone churn the spindle's hole could be drilled and bushed. He claimed the combination of the hollow perforated cylinder dash and the central guide spindle and stationary block with the ordinary upright tub churn. **Honest limits.** A bucket, threaded rod and printed parts stand in for his churn, spindle and dash. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Mga Materyales

12

Mga Kinakailangang Kasangkapan

11

Mga design file

1

Ang blueprint na ito ay gumagawa ng

Thumbnail
Placeholder

Panghalo ng mantikilya

Free

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Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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