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Double-Swing Churn: Swing the Platform, the Toothed Pieces Work Both Dashers
Working a dash churn means lifting the dasher, again and again.
Daniel Osgood, Jr., of Bluehill, Maine, received US 831, dated 9 July 1838, for what he called "Osgood's Double-Swing Churn": two common churns on a platform swinging in a frame. The side pieces rising from the platform are cut into teeth that mesh with the teeth of two pieces hung above, so as the platform swings backward and forward a lever is alternately raised and depressed, "giving the downward and upward motion to the dashers." The power required, he wrote, "is nearly in proportion to the power required to draw a pendulum in its lateral motion compared with that of raising its weight."
This rung compares the swing of his platform and ours, then prints the toothed sectors, builds a tabletop frame for two jars, and makes butter.
中级
About 6 hours, plus printing
说明
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1
Swing period and dasher stroke
Swing period and dasher stroke
正在加载 Jupyter 笔记本…
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One load balancing another on a lever
One load balancing another on a lever
The embedded blueprint lifts water with a counterweighted beam. Osgood's beam balances one churn's dasher against the other's, and he says to balance a single churn with a weight.
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Read US 831
Read US 831
"This saving of labor is acquired by placing two common churns, Figure 3 (a a) on a swinging platform (b). This platform is made to swing by being suspended in the frame A, B, C, D, by a rod passing through the frame and two pieces (d d) rising from the sides of the platform (b)... The ends of the side pieces (d, d,) and the corresponding upper, pieces (g, g,) are cut into teeth or cogs (l l,) and mesh into each other."
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Print four toothed sectors
Print four toothed sectors
Print four identical sectors (/uploads/blueprints/double-swing-churn-sector.stl), flat. Each has a 6.6 mm pivot hole at the centre of its teeth and two screw holes in its tail. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.
此步骤所需材料：
PETG线材1 个所需工具：
FDM 3D 打印机5
5
Build the frame and platform
Build the frame and platform
Make two A-frames of pine about 420 mm tall, joined at the top by a cross bar. Drill both for two 6 mm steel rods 60 mm apart, one above the other: the lower rod carries the platform and the upper carries the beam. Cut a plywood platform 280 × 130 mm. Screw an upright pine strip to each side of the platform, reaching up to the lower rod, and screw a sector to the top of each strip, teeth up and pivot on the rod.
此步骤所需材料：
松木板1 个
胶合板1 个
低碳钢圆棒1 个
#8 × 1 英寸木螺钉1 个
木工胶1 个所需工具：
手锯
钢锯
充电式电钻
钻头套装
夹具
卷尺6
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Hang the beam and dashers
Hang the beam and dashers
Screw the other two sectors to two short pine pieces hung on the upper rod, teeth down, meshing with the lower ones. Join the hung pieces with a cross bar and fix a beam across it at right angles, 200 mm long. Hang a dowel dasher with a plywood disc from each end on a loose screw, through a hole in each jar's lid. Fit a long handle to the platform.
此步骤所需材料：
松木板1 个
硬木销钉1 个胶合板1 个
玻璃罐2 个#8 × 1 英寸木螺钉1 个所需工具：
手锯充电式电钻钻头套装
螺丝刀套装7
7
The patent drawing
The patent drawing
US 831 drawing sheet, public domain (expired patent).
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Swing and make butter
Swing and make butter
Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour half into each jar, no more than a third full, and fit the lids. Swing the platform steadily by the handle; the dashers rise and fall in turn. 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.
此步骤所需材料：
鲜奶油500 毫升
粗海盐1 个
水1 个所需工具：
留置式探针温度计
秒表
数字厨房秤
大号不锈钢搅拌盆9
9
Teeth that slip, a swing that dies
Teeth that slip, a swing that dies
Double-swing churn troubleshooting.
Flow
Loading...
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History and honest limits
History and honest limits
**Daniel Osgood, Jr.** of Bluehill, Hancock County, Maine, received US 831, dated 9 July 1838. He gave the dimensions for common use: a frame 3 ft 1 in high, churns 1 ft 7 in high, 14 inches across at the bottom and 12 at the top, a platform 2 ft 6 in by 1 ft, and the pendulum 1 ft 4 in from its rod to the platform. "When but one churn is necessary, the other may be dispensed with by substituting any other weight in its stead to balance the one that is used." He claimed "the manner in which the dashers are worked by the pendulous motion of the churn."
**Honest limits.** Jars on a tabletop frame stand in for his two churns, and printed sectors for his wooden teeth. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.
材料
11- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 2 个占位符
- 1 个占位符
- 1 个占位符
- 2 个占位符
- 500 毫升占位符
- 1 个占位符
- 1 个占位符
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