LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Ventilating Paddle Rocking Churn: Hinged Paddles That Strike One Way and Slip the Other
George W. Cook, Schenectady, New York · Public domain (expired patent)
Woody

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Woody

6. október 2026NO
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Ventilating Paddle Rocking Churn: Hinged Paddles That Strike One Way and Slip the Other

Cook set out to let "a current of fresh air" into the churn "to hasten the production of the butter and to improve its quality." George W. Cook of Schenectady, New York, received US 3,460, dated 28 February 1844, for "Cook's Ventilating Churn": a semi-cylinder balanced on pivots so it rocks easily, its top closed by thin boards except a narrow opening in the middle. Inside, two frames at about 45° from the vertical, inclined opposite ways, carry perforated paddles hung on gudgeons. As the vessel is canted, one set swings square to its frame and strikes the cream while the other turns flat against its stops. This rung works out how the paddles hang, then prints the ends, frames and paddles, bends a stainless semi-cylinder, and makes butter.
Lengra kominn
About 6 hours, plus printing

Leiðbeiningar

1

How the paddles hang

Hleð Jupyter-vinnubók…
2

A rocking churn on pivots before it

The embedded blueprint rocks a box on gudgeons with springs to return it. Cook balances his vessel on pivots and puts hinged paddles inside.
3

Read US 3,460

"When the vessel is canted, as represented in Fig. 2 the paddles N drop down or turn on their gudgeons assuming a position nearly at right angles to the sides of the frame of the paddles. At the same time the paddles N2 of the other frame turn until they are in a line parallel with the sides of the frame when they strike against pins or stops O2 inserted into the sides of the frame on the inside thereof."
4

Print the parts

Print two vessel ends flat, each with its groove, pivot boss and the two ledges for the frames. Print two frames and eight perforated paddles. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Efni fyrir þetta skref:

PETG-þráðurPETG-þráður1 stykki

Nauðsynleg verkfæri:

FDM-þrívíddarprentariFDM-þrívíddarprentari
5

Print the end

The end, printed as step 4 describes.
HönnunarskráSTLCC0 - Free
Sækja líkan
6

Print the frame

The frame, printed as step 4 describes.
HönnunarskráSTLCC0 - Free
Sækja líkan
7

Print the paddle

The paddle, printed as step 4 describes.
HönnunarskráSTLCC0 - Free
Sækja líkan
8

Bend and close the vessel

Cut a 0.5 mm stainless sheet 160 mm wide and about 252 mm long, deburr it, and bend it round a 160 mm form into a half circle. Seat it in both ends' grooves in silicone. Cut two thin plywood boards to close the top, sloping 10–15° down toward the middle and leaving a narrow opening there, as his.

Efni fyrir þetta skref:

Plata úr ryðfríu stáli - 304Plata úr ryðfríu stáli - 3041 stykki
SílikonþéttiefniSílikonþéttiefni1 stykki
KrossviðarplataKrossviðarplata1 stykki

Nauðsynleg verkfæri:

PlötuklippurPlötuklippur
GratáhaldGratáhald
GúmmíhamarGúmmíhamar
ÞvingurÞvingur
LaufsögLaufsög
9

Hang the paddles and the vessel

Hang four paddles in each frame on M3 screws through the frame's sides, so they swing freely and lie against the stops one way. Set the two frames on the ledges inside the vessel, inclined opposite ways. Build a pine stand with two posts and hang the vessel on an M8 bolt through each end's boss, so it is nicely balanced.

Efni fyrir þetta skref:

VélskrúfurVélskrúfur1 stykki
SexkantróSexkantró1 stykki
FuruborðFuruborð1 stykki
Tréskrúfa #8 x 1"Tréskrúfa #8 x 1"1 stykki
TrélímTrélím1 stykki

Nauðsynleg verkfæri:

HandsögHandsög
HleðsluborHleðslubor
BorasettBorasett
SkrúfjárnasettSkrúfjárnasett
SkiptilykillSkiptilykill
10

The patent drawing

US 3,460 drawing sheet, public domain (expired patent).
Skref 10 - Image 1
11

Rock and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour 500 ml through the middle opening. Rock the vessel steadily from side to side; time until the butter comes. Lift out the frames, then 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.

Efni fyrir þetta skref:

RjómiRjómi500 ml
Gróft sjávarsaltGróft sjávarsalt1 stykki
VatnVatn1 stykki

Nauðsynleg verkfæri:

Hitamælir með nema sem situr íHitamælir með nema sem situr í
SkeiðklukkaSkeiðklukka
Stafræn eldhúsvogStafræn eldhúsvog
Stór hrærskál úr ryðfríu stáliStór hrærskál úr ryðfríu stáli
12

Paddles that stick, a vessel that tips

Ventilating paddle rocking churn troubleshooting.

Flow

Loading...
13

History and honest limits

**George W. Cook** of Schenectady, New York, received US 3,460, dated 28 February 1844. Blocks on the vessel's convex side met a cross bar of the frame to stop it canting too far; handles in its side rocked it; iron straps strengthened it; a plugged aperture drew off the milk; a button held the two frames in place. He claimed combining with a rocking churn "floats or paddles arranged in and hinged to a frame." **Honest limits.** Stainless sheet, plywood and printed parts stand in for his wooden vessel and frames. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Efni

12

Nauðsynleg verkfæri

15

Hönnunarskrár

3

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Tengd Blueprint

Þessi blueprint deila þekkingu — tækni, efni eða meginreglur

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