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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.
중급
About 5 hours, plus printing
안내
1
1
The streams
The streams
Jupyter 노트북 불러오는 중…
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 (/uploads/blueprints/twin-plunger-air-chamber-churn-partition.stl) with their foot holes and air holes, two plungers (/uploads/blueprints/twin-plunger-air-chamber-churn-plunger.stl) and the brake hub (/uploads/blueprints/twin-plunger-air-chamber-churn-brake-hub.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.
이 단계의 재료:
PETG 필라멘트1 개필요한 도구:
FDM 3D 프린터5
5
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.
이 단계의 재료:
식품용 보관 용기1 개
실리콘 실런트1 개필요한 도구:
클램프
줄자6
6
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.
이 단계의 재료:
단단한 나무 목심1 개
소나무 판재1 개
기계 나사1 개
육각 너트1 개
목공용 접착제1 개
#8 × 1인치 나무 나사1 개필요한 도구:
손톱(핸드소)
무선 드릴
드릴 비트 세트
드라이버 세트7
7
The patent drawing
The patent drawing
US 7,298 drawing sheet, public domain (expired patent).
8
8
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.
이 단계의 재료:
생크림1500 ml
굵은 천일염1 개
물1 개필요한 도구:
꽂아 두는 프로브 온도계
스톱워치
디지털 주방 저울
큰 스테인리스강 믹싱볼9
9
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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10
10
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.
재료
12- 1 개플레이스홀더
- 1 개플레이스홀더
- 1 개플레이스홀더
- 1 개플레이스홀더
- 1 개플레이스홀더
- 1 개플레이스홀더
- 1 개플레이스홀더
- 1 개플레이스홀더
- 플레이스홀더
- 1500 ml플레이스홀더
- 1 개플레이스홀더
- 1 개플레이스홀더
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