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Twin-Plunger Air-Chamber Churn: Two Plungers Throw the Cream Through a Middle Chamber
John Andrews, Middlesex County, Massachusetts · Public domain (expired patent)
Emma

Imeundwa na

Emma

6. Oktoba 2026SE
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Twin-Plunger Air-Chamber Churn: Two Plungers Throw the Cream Through a Middle Chamber

Andrews made the cream do the travelling, back and forth through a middle chamber. John Andrews of Middlesex County, Massachusetts, received US 7,298, dated 23 April 1850, for a churn box divided by two vertical partitions into three apartments, with a series of holes "at or near its bottom" in each partition, "unprovided with valves." Each outer chamber has a plunger on a rod jointed to a brake, "one of the said plungers being elevated while the other is being depressed," so the cream is thrown "back and forth in several streams through the air chamber." Holes near the partitions' tops let air in under each rising plunger. This rung works out the streams, then prints the partitions and plungers, builds the box and brake, and makes butter.
Kati
About 5 hours, plus printing

Maagizo

1

The streams

Inapakia daftari la Jupyter…
2

Two dashers worked oppositely by one lever before it

The embedded blueprint works two dashers in one churn from a lever. Andrews puts each plunger in its own chamber so the cream must flow between them.
3

Read US 7,298

"Through each of the partitions a, b, and near the upper part thereof, I make one or more holes d, d, d, &c., as seen in Figs. 2 and 3, they being so arranged that the plunger F or F', during its upward stroke, shall pass partially or wholly above them, and in order to allow air to rush through said hole or holes and into the space directly under the plunger. The descent of the plunger forces such air into and through the cream."
4

Print the parts

Print two partitions with their foot holes and air holes, two plungers and the brake hub. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Vifaa kwa hatua hii:

Uzi wa PETGUzi wa PETG1 kipande

Zana zinazohitajika:

Printa ya 3D ya nyuzi (FDM)Printa ya 3D ya nyuzi (FDM)
5

Print the partition

The partition, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
6

Print the plunger

The plunger, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
7

Print the brake hub

The brake hub, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
8

The box

Take a food-safe box about 230 × 120 × 160 mm. Glue the two partitions across it in silicone, dividing it into three equal chambers.

Vifaa kwa hatua hii:

Chombo cha kuhifadhi cha daraja la chakulaChombo cha kuhifadhi cha daraja la chakula1 kipande
Kizibo cha SilikoniKizibo cha Silikoni1 kipande

Zana zinazohitajika:

VibanoVibano
Tepi ya kupimiaTepi ya kupimia
9

Plungers and brake

Glue a 12 mm hardwood dowel rod in each plunger. Screw two pine standards to the box's middle, pass a dowel through them as the rocker shaft, and fix a pine brake across it with the hub. Join each rod to an end of the brake on a loose screw, so one plunger rises as the other falls.

Vifaa kwa hatua hii:

Vijiti vya mbao ngumuVijiti vya mbao ngumu1 kipande
Ubao wa msonobariUbao wa msonobari1 kipande
Skrubu za mashineSkrubu za mashine1 kipande
Nati ya pembe sitaNati ya pembe sita1 kipande
Gundi ya MbaoGundi ya Mbao1 kipande
Skrubu ya mti #8 x inchi 1Skrubu ya mti #8 x inchi 11 kipande

Zana zinazohitajika:

Msumeno wa mkonoMsumeno wa mkono
Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya bisibisiSeti ya bisibisi
10

The patent drawing

US 7,298 drawing sheet, public domain (expired patent).
Hatua 10 - Image 1
11

Rock the brake and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres, below the top holes. Rock the brake steadily 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.

Vifaa kwa hatua hii:

Malai nzitoMalai nzito1500 ml
Chumvi ya Bahari MbichiChumvi ya Bahari Mbichi1 kipande
MajiMaji1 kipande

Zana zinazohitajika:

Kipima joto chenye kijiti kinachobaki ndaniKipima joto chenye kijiti kinachobaki ndani
Saa ya kupima mudaSaa ya kupima muda
Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
Bakuli kubwa la kuchanganyia la chuma cha puaBakuli kubwa la kuchanganyia la chuma cha pua
12

Plungers that stick, cream over the top

Twin-plunger air-chamber churn troubleshooting.

Flow

Loading...
13

History and honest limits

**John Andrews** of Middlesex County, Massachusetts, received US 7,298, dated 23 April 1850. He wrote that the streams "so intermingle air with the lacteal matter as to very quickly oxygenate and cause a separation"; that is his account. He claimed the combination of the external chambers, their plungers and passages with the middle or air chamber, and the air-entering passages d. **Honest limits.** A food-safe box and printed parts stand in for his wooden box and plungers. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Vifaa

12

Zana Zinazohitajika

11

Faili za muundo

3

Mchoro huu unatengeneza

Thumbnail
Kishikilia nafasi

Chombo cha kusukia siagi

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Double-Dasher Lever Churn: Swing One Lever, One Dasher Rises as the Other Falls

Double-Dasher Lever Churn: Swing One Lever, One Dasher Rises as the Other Falls

na WoodyNO

Utengenezaji mbao

36
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0
0
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Interraking Plunger Churn: Two Rakes Worked Oppositely by a Double Crank

Interraking Plunger Churn: Two Rakes Worked Oppositely by a Double Crank

na MartinNO

CHAKULA NA VINYWAJI

23
0
0
0
0
0
Air-Pump Annular Dasher Churn: A Pump in the Middle, a Ring Dasher Round It

Air-Pump Annular Dasher Churn: A Pump in the Middle, a Ring Dasher Round It

na MartinNO

CHAKULA NA VINYWAJI

32
0
0
0
0
0

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