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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.
Fortgeschritten
About 5 hours, plus printing
Anweisungen
1
1
The streams
The streams
Jupyter-Notebook wird geladen …
2
2
Two dashers worked oppositely by one lever before it
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
3
Read US 7,298
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
4
Print the parts
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.
Materialien für diesen Schritt:
PETG-Filament1 StückBenötigte Werkzeuge:
FDM-3D-Drucker5
5
Print the partition
Print the partition
The partition, printed as step 4 describes.
6
6
Print the plunger
Print the plunger
The plunger, printed as step 4 describes.
7
7
Print the brake hub
Print the brake hub
The brake hub, printed as step 4 describes.
8
8
The box
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.
Materialien für diesen Schritt:
Vorratsbehälter in Lebensmittelqualität1 Stück
Silikondichtmasse1 StückBenötigte Werkzeuge:
Schraubzwingen
Bandmaß (Rollmeter)9
9
Plungers and brake
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.
Materialien für diesen Schritt:
Hartholzdübel1 Stück
Kiefernbrett1 Stück
Maschinenschrauben1 Stück
Sechskantmutter1 Stück
Holzleim1 Stück
Holzschraube #8 x 1"1 StückBenötigte Werkzeuge:
Handsäge
Akkubohrschrauber
Bohrersatz
Schraubendreher-Satz10
10
The patent drawing
The patent drawing
US 7,298 drawing sheet, public domain (expired patent).
11
11
Rock the brake and make butter
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.
Materialien für diesen Schritt:
Schlagsahne1500 ml
Grobes Meersalz1 Stück
Wasser1 StückBenötigte Werkzeuge:
Einsteck-Fühlerthermometer
Stoppuhr
Digitale Küchenwaage
Große Rührschüssel aus Edelstahl12
12
Plungers that stick, cream over the top
Plungers that stick, cream over the top
Twin-plunger air-chamber churn troubleshooting.
Flow
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13
13
History and honest limits
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.
Materialien
12- 1 StückPlatzhalter
- Platzhalter
- 1 StückPlatzhalter
- 1 StückPlatzhalter
- 1 StückPlatzhalter
- 1 StückPlatzhalter
- 1 StückPlatzhalter
- 1 StückPlatzhalter
- 1 StückPlatzhalter
- 1500 mlPlatzhalter
- 1 StückPlatzhalter
- 1 StückPlatzhalter
Benötigte Werkzeuge
11- Platzhalter
- Platzhalter
- 1 vendor sell this, none ship to you yetPlatzhalter
- Platzhalter
- 1 vendor sell this, none ship to you yetPlatzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
Designdateien
3Dieser Bauplan stellt her
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CC0 Gemeinfrei
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