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Spring-Return Rocking Churn: Springs Under Each End Lift the Low One Back
In a rocking churn the cream runs from end to end, and its weight makes each return stroke hard work.
Daniel F. Hitt of Galena, Illinois, received US 2,800, dated 7 October 1842, for a churn whose body rocks on gudgeons at its middle, with a spring under each end connected to the body by a strap, cord or chain. As the cream "runs from end to end of the containing vessel, it acquires a momentum"; "by means of the reaction of the springs, the momentum thus acquired is rendered available in obtaining the return motion." A perforated diaphragm across the middle lets the cream through on its way.
This rung estimates the spring force, then prints the diaphragm and gudgeon bosses, bows two spring-steel strips under a rocking box, and makes butter.
中级
About 5 hours, plus printing
说明
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Cream's moment and spring force
Cream's moment and spring force
正在加载 Jupyter 笔记本…
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A rocking churn before it
A rocking churn before it
The embedded blueprint rocks a churn on a stool. Hitt hangs his on gudgeons and adds springs to help it back.
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Read US 2,800
Read US 2,800
"I am aware that there is not any actual gain of power in the employment of springs in the manner designated, and they are not, therefore, used with any such view; but as the cream runs from end to end of the containing vessel, it acquires a momentum which would render the continuance of the rocking motion under the foregoing manner of suspending the containing vessel, one of much difficulty."
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Print the parts
Print the parts
Print the perforated diaphragm flat (/uploads/blueprints/spring-return-rocking-churn-diaphragm.stl), two diaphragm guides (/uploads/blueprints/spring-return-rocking-churn-diaphragm-guide.stl) and two gudgeon bosses (/uploads/blueprints/spring-return-rocking-churn-gudgeon-boss.stl). 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
The rocking box
The rocking box
Take a food-safe box about 300 × 150 × 140 mm with a lid. Screw a guide inside each long side at the middle and slide the diaphragm into them, so it lifts out for washing as his did on buttons. Screw a gudgeon boss to the outside of each long side at the middle, and fit an M8 bolt through each as a gudgeon. Fix a dowel handle to one end.
此步骤所需材料：
食品级贮存容器1 个
机螺钉1 个
六角螺母1 个
硬木销钉1 个
#8 × 1 英寸木螺钉1 个所需工具：
充电式电钻
钻头套装
螺丝刀套装
活动扳手6
6
Frame, springs and cords
Frame, springs and cords
Build a pine base with two braced posts drilled for the gudgeons, so the box swings clear. Screw a spring-steel strip to the base under each end, bowed up so its tip stands just below the box when the box is level. Tie each tip to the box's end with a cord, leaving a little slack.
此步骤所需材料：
松木板1 个
弹簧钢带1 个
伞绳1 个#8 × 1 英寸木螺钉1 个
木工胶1 个所需工具：
手锯充电式电钻钻头套装螺丝刀套装
铁皮剪
夹具7
7
The patent drawing
The patent drawing
US 2,800 drawing sheet, public domain (expired patent).
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8
Rock and make butter
Rock and make butter
Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1 litre and fit the lid. Rock the box by its handle, letting the springs lift each end back; 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1000 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
A box that sticks down, springs that slap
A box that sticks down, springs that slap
Spring-return rocking churn troubleshooting.
Flow
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History and honest limits
History and honest limits
**Daniel F. Hitt** of Galena, Jo Daviess County, Illinois, received US 2,800, dated 7 October 1842. His body could be a trunk, box or cylinder; one end was removable, held "by wedges, screws, or otherwise"; the springs "may be varied in form, and may be made either of wood, or of metal." He did not claim the rocking churn or the suspension on gudgeons, both already used, but the manner of combining the springs with a churn that vibrates on gudgeons.
**Honest limits.** A food-safe box and spring-steel strips stand in for his body and springs. The notebook's moment is an estimate, not a measurement. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.
材料
13- 1 个占位符
- 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
- 1 个占位符
- 1 个占位符
- 1000 毫升占位符
- 1 个占位符
- 1 个占位符
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