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Self-Closing Float Dasher Churn: Floats That Open to Churn and Close to Gather

Robert W. Davis, Rodgersville, New York · Public domain (expired patent)

أنشأه

Woody

6. أكتوبر 2026

Self-Closing Float Dasher Churn: Floats That Open to Churn and Close to Gather

Davis wanted one dasher that would churn "in the most effectual manner," then gather the butter and work out the buttermilk. Robert W. Davis of Rodgersville, New York, received US 7,233, dated 2 April 1850, for self-adjusting rotary churn-dashers. The dasher's fixed slats are set "at such angles as to force the cream toward the center"; movable floats hinged to its sides stand open when turning that way and move it outward, "which various and contrary motions so agitate it, that the butter is soon formed." Turned backward, the floats close on the slats so the outside forms "a uniform curve concentric to the axis," which throws the butter to the sides and bottom and presses it free of milk. This rung looks at the floats' swing, then prints the sides, slats and floats, assembles the dasher in a box, and makes butter.

متوسط

About 4 hours, plus printing

التعليمات

The floats' swing

جارٍ تحميل دفتر Jupyter…

A dasher that churns one way and gathers the other before it

The embedded blueprint reverses fixed paired blades to roll the butter up. Davis lets hinged floats change shape by themselves when the crank is reversed.

Read US 7,233

"In order to gather the butter and work it, the dasher is then turned in the contrary direction, and the movable slats then closing the outside of the slats of the dasher form a uniform curve concentric to the axis and moving with the convex side foremost. By a few revolutions of the dasher the butter is thrown from the center to the sides and bottom of the churn box, and these gathered into a roll."

Print the parts

Print two side pieces (/uploads/blueprints/self-closing-float-dasher-churn-side.stl), four fixed slats (/uploads/blueprints/self-closing-float-dasher-churn-slat.stl), four curved floats with hinge eyes (/uploads/blueprints/self-closing-float-dasher-churn-float.stl) and the crank arm (/uploads/blueprints/self-closing-float-dasher-churn-crank-arm.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

المواد لهذه الخطوة:

خيط PETG1 قطعة

الأدوات المطلوبة:

طابعة ثلاثية الأبعاد بالخيط (FDM)

Assemble the dasher

Slide the two side pieces onto a 10 mm square hardwood shaft 148 mm apart and screw the four slats between them. Hang each float between the arms' knuckles on a 3 mm stainless rod as its hinge, so it swings open one way and lies against its slat the other.

المواد لهذه الخطوة:

أوتاد من خشب صلب1 قطعة

قضيب فولاذ طري1 قطعة

براغي آلية1 قطعة

غراء خشب1 قطعة

الأدوات المطلوبة:

منشار حديد

طقم مفكات

منشار يدوي

The box

Take a food-safe box about 230 × 190 × 200 mm. Drill both ends on the axis 100 mm up, pass the shaft through with a leather washer at each end, and glue the crank arm and a dowel handle on.

المواد لهذه الخطوة:

حافظة خزن بدرجة غذائية1 قطعة

شريحة جلدية1 قطعة

غراء خشب1 قطعة

الأدوات المطلوبة:

مثقاب لاسلكي

طقم لقم ثقب

The build in 3D

FreeCAD model of this build, not of the patent: the box with one side off to show the dasher's side pieces, the fixed slats and the hinged curved floats, and the crank.

ملف التصميمBLENDCC0 - Free

تنزيل النموذج

Churn forward, gather backward

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Crank forward, floats open; time until the butter comes. Then crank backward so the floats close and the round dasher gathers the butter into a roll; draw off the buttermilk and keep cranking to work it, as he did. 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.

المواد لهذه الخطوة:

قشدة كاملة الدسم1500 مل

ملح بحري خشن1 قطعة

ماء1 قطعة

الأدوات المطلوبة:

مقياس حرارة بمجس يبقى داخل الطعام

ساعة إيقاف

ميزان مطبخ رقمي

وعاء خلط كبير من فولاذ مقاوم للصدأ

Floats that won't open or close

Self-closing float dasher troubleshooting.

Flow

History and honest limits

**Robert W. Davis** of Rodgersville, Steuben County, New York, received US 7,233, dated 2 April 1850. His drawing shows the dasher in a churn box with slats D strengthening it. He claimed "the self adjusting float or slat (C) which opens when churning the cream and closes of itself when the dasher is turned in the opposite direction to gather the butter." **Honest limits.** A food-safe box and printed parts stand in for his wooden box and dasher. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.