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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

Dibuat oleh

Emma

6. Oktober 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.
Pemula
About 2 hours, plus printing

Instruksi

1

Air per stroke

Memuat notebook Jupyter…
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.

Material untuk langkah ini:

Filamen PETGFilamen PETG1 buah

Alat yang dibutuhkan:

Pencetak 3D filamen (FDM)Pencetak 3D filamen (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.

Material untuk langkah ini:

Ember 20 LiterEmber 20 Liter1 buah
Batang berulirBatang berulir1 buah
Mur Segi EnamMur Segi Enam1 buah
Ring RataRing Rata1 buah
Sealant SilikonSealant Silikon1 buah

Alat yang dibutuhkan:

Bor Tanpa KabelBor Tanpa Kabel
Set Mata BorSet Mata Bor
Kunci InggrisKunci Inggris
Gergaji BesiGergaji Besi
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.

Material untuk langkah ini:

Pasak kayu kerasPasak kayu keras1 buah
Balok Kayu KerasBalok Kayu Keras1 buah
Lem KayuLem Kayu1 buah

Alat yang dibutuhkan:

Bor Tanpa KabelBor Tanpa Kabel
Set Mata BorSet Mata Bor
Gergaji TanganGergaji Tangan
AmplasAmplas
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.
Berkas desainBLENDCC0 - Free
Unduh model
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.
Langkah 8 - Image 1

Material untuk langkah ini:

Krim kentalKrim kental1500 ml
Garam Laut KasarGaram Laut Kasar1 buah
AirAir1 buah

Alat yang dibutuhkan:

Termometer probe tinggal-pasangTermometer probe tinggal-pasang
StopwatchStopwatch
Timbangan Dapur DigitalTimbangan Dapur Digital
Mangkuk aduk baja nirkarat (besar)Mangkuk aduk baja nirkarat (besar)
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.

Bahan

12
  • 4
    Filamen PETG
    1 buah
    Placeholder
  • 5
    Ember 20 Liter
    1 buah
    Placeholder
  • 5
    Batang berulir
    1 buah
    Placeholder
  • 5
    Mur Segi Enam
    1 buah
    Placeholder
  • 5
    Ring Rata
    1 buah
    Placeholder
  • 5
    Sealant Silikon
    1 buah
    Placeholder
  • 6
    Pasak kayu keras
    1 buah
    Placeholder
  • 6
    Balok Kayu Keras
    1 buah
    Placeholder
  • 6
    Lem Kayu
    1 buah
    Placeholder
  • 8
    Krim kental
    1500 ml
    Placeholder
  • 8
    Garam Laut Kasar
    1 buah
    Placeholder
  • 8
    Air
    1 buah
    Placeholder

Alat yang Diperlukan

11

Berkas desain

1

Blueprint terkait

Blueprint ini berbagi pengetahuan — teknik, bahan, atau prinsip

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CC0 Domain Publik

Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.

Dukung Maker dengan membeli produk melalui Cetak Biru mereka di mana mereka mendapatkan Komisi Pembuat yang ditetapkan oleh Penjual, atau buat iterasi baru dari Cetak Biru ini dan masukkan sebagai koneksi di milik Anda sendiri.

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