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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

Dicipta oleh

Emma

6. Oktober 2026SE
31
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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

Arahan

1

Air per stroke

Memuatkan buku nota 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.

Bahan untuk langkah ini:

Filamen PETGFilamen PETG1 keping

Alatan diperlukan:

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.

Bahan untuk langkah ini:

Baldi 20 LiterBaldi 20 Liter1 keping
Rod berbenangRod berbenang1 keping
Nat HeksagonNat Heksagon1 keping
Sesendal RataSesendal Rata1 keping
Pengedap SilikonPengedap Silikon1 keping

Alatan diperlukan:

Gerudi Tanpa WayarGerudi Tanpa Wayar
Set Mata GerudiSet Mata Gerudi
Sepana boleh larasSepana boleh laras
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.

Bahan untuk langkah ini:

Pasak kayu kerasPasak kayu keras1 keping
Blok Kayu KerasBlok Kayu Keras1 keping
Gam KayuGam Kayu1 keping

Alatan diperlukan:

Gerudi Tanpa WayarGerudi Tanpa Wayar
Set Mata GerudiSet Mata Gerudi
Gergaji TanganGergaji Tangan
Kertas PasirKertas Pasir
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.
Fail Reka BentukBLENDCC0 - Free
Muat turun 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

Bahan untuk langkah ini:

Krim pekatKrim pekat1500 ml
Garam Laut KasarGaram Laut Kasar1 keping
AirAir1 keping

Alatan diperlukan:

Termometer prob kekalTermometer prob kekal
Jam RandikJam Randik
Penimbang Dapur DigitalPenimbang Dapur Digital
Mangkuk adun keluli tahan karat (besar)Mangkuk adun keluli tahan karat (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 keping
    Pemegang Tempat
  • 5
    Baldi 20 Liter
    1 keping
    Pemegang Tempat
  • 5
    Rod berbenang
    1 keping
    Pemegang Tempat
  • 5
    Nat Heksagon
    1 keping
    Pemegang Tempat
  • 5
    Sesendal Rata
    1 keping
    Pemegang Tempat
  • 5
    Pengedap Silikon
    1 keping
    Pemegang Tempat
  • 6
    Pasak kayu keras
    1 keping
    Pemegang Tempat
  • 6
    Blok Kayu Keras
    1 keping
    Pemegang Tempat
  • 6
    Gam Kayu
    1 keping
    Pemegang Tempat
  • 8
    Krim pekat
    1500 ml
    Pemegang Tempat
  • 8
    Garam Laut Kasar
    1 keping
    Pemegang Tempat
  • 8
    Air
    1 keping
    Pemegang Tempat

Alatan Diperlukan

11

Fail reka bentuk

1

Blueprint ini membuat

Thumbnail
Pemegang tempat

Tong pengocak mentega

Free

19
0

Blueprint berkaitan

Blueprint ini berkongsi pengetahuan — teknik, bahan atau prinsip

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CC0 Domain Awam

Blueprint ini dikeluarkan di bawah CC0. Anda bebas menyalin, mengubah, mengedar, dan menggunakan karya ini untuk sebarang tujuan, tanpa meminta kebenaran.

Sokong Pembuat dengan membeli produk melalui Blueprint mereka di mana mereka memperoleh Komisen Pembuat ditetapkan oleh Penjual, atau cipta iterasi baru Blueprint ini dan sertakan ia sebagai sambungan dalam Blueprint anda sendiri untuk berkongsi hasil.

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