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Self-Turning Roller Churn: Fluted Rollers Spun by a Fixed Wheel as the Dasher Turns
Lewis W. Colver, St. Louis, Missouri · Public domain (expired patent)
Martin

Imeundwa na

Martin

6. Oktoba 2026NO
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Self-Turning Roller Churn: Fluted Rollers Spun by a Fixed Wheel as the Dasher Turns

Colver's improvement consisted "in giving the beaters of a churn dasher a revolving motion on their own axis." Lewis W. Colver of St. Louis, Missouri, received US 6,726, dated 18 September 1849, for a rotary churn-dasher of four horizontal beaters between a cross at one end and a round flat case at the other. Two are wedge beaters; the other two are fluted rollers with hook-shaped flutes, each between two edge-beaters whose inner faces curve in toward it. A belt from a large stationary pulley inside the case turns the rollers fast as the dasher goes round; "the granules of butter are drawn by the hooked flutes into the converging spaces between the rolls and the edge beaters, thus compressing them together." This rung works out the rollers' speed, then prints the fixed gear, rollers, beaters and end pieces, builds the dasher in a box, and makes butter.
Juu
About 6 hours, plus printing

Maagizo

1

How fast the rollers spin

Inapakia daftari la Jupyter…
2

Wheels carried round a fixed wheel

The embedded blueprint explains gears carried round a central gear. Colver's rollers are such planets: the central wheel stands still and the dasher carries them round it.
3

Read US 6,726

"The central pulley is held stationary and the dasher is revolved around it, and as the central pulley is much larger than the others the velocity of the rollers are proportionately increased." And: "I have hitherto described the fluted rollers as driven by a belt, that being most convenient in practice, but it is evident that cogwheels may be employed for the same purpose."
4

Print the parts

Print the fixed gear, two fluted rollers with their pinions, two pairs of edge-beaters, two wedge beaters, the cross, the case plate and the crank arm. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Vifaa kwa hatua hii:

Uzi wa PETGUzi wa PETG1 kipande

Zana zinazohitajika:

Printa ya 3D ya nyuzi (FDM)Printa ya 3D ya nyuzi (FDM)
5

Print the fixed gear

The fixed gear, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
6

Print the fluted roller

The fluted roller, printed as step 4 describes.
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7

Print the edge-beaters

The edge-beaters, printed as step 4 describes.
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8

Print the wedge beater

The wedge beater, printed as step 4 describes.
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9

Print the cross

The cross, printed as step 4 describes.
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10

Print the case plate

The case plate, printed as step 4 describes.
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11

Print the crank arm

The crank arm, printed as step 4 describes.
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12

Build the dasher

Bolt the beaters between the cross and the case plate with M3 screws: wedge beaters on two opposite arms, edge-beater pairs on the other two. Drop a fluted roller between each pair, its gudgeons in the cross and the case plate, its pinion beyond the plate. Screw a short 10 mm square hardwood stub into the cross's centre for the crank.

Vifaa kwa hatua hii:

Skrubu za mashineSkrubu za mashine1 kipande
Nati ya pembe sitaNati ya pembe sita1 kipande
Vijiti vya mbao ngumuVijiti vya mbao ngumu1 kipande

Zana zinazohitajika:

Seti ya bisibisiSeti ya bisibisi
Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
Msumeno wa mkonoMsumeno wa mkono
13

Fix the gear and fit the box

Take a food-safe box about 230 × 190 × 190 mm. Screw the fixed gear to the inside of one end on the dasher's axis, with a 10 mm steel pin through its centre into the case plate's hole, so the dasher turns round it and its teeth mesh the rollers' pinions. Drill the other end for the crank stub and glue the crank arm and handle on.

Vifaa kwa hatua hii:

Chombo cha kuhifadhi cha daraja la chakulaChombo cha kuhifadhi cha daraja la chakula1 kipande
Ufito wa chuma lainiUfito wa chuma laini1 kipande
Skrubu ya mti #8 x inchi 1Skrubu ya mti #8 x inchi 11 kipande
Gundi ya MbaoGundi ya Mbao1 kipande

Zana zinazohitajika:

Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Msumeno wa chumaMsumeno wa chuma
Seti ya bisibisiSeti ya bisibisi
14

The build in 3D

FreeCAD model of this build, not of the patent: the box with one side off to show the dasher of wedge beaters and fluted rollers between edge-beaters, the fixed gear meshing the rollers' pinions at the case end, and the crank.
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15

Crank and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Crank steadily; the rollers spin on their own as the dasher turns. 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.
Hatua 15 - Image 1

Vifaa kwa hatua hii:

Malai nzitoMalai nzito1500 ml
Chumvi ya Bahari MbichiChumvi ya Bahari Mbichi1 kipande
MajiMaji1 kipande

Zana zinazohitajika:

Kipima joto chenye kijiti kinachobaki ndaniKipima joto chenye kijiti kinachobaki ndani
Saa ya kupima mudaSaa ya kupima muda
Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
Bakuli kubwa la kuchanganyia la chuma cha puaBakuli kubwa la kuchanganyia la chuma cha pua
16

Rollers that do not spin, gears that jam

Self-turning roller churn troubleshooting.

Flow

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17

History and honest limits

**Lewis W. Colver** of St. Louis, Missouri, received US 6,726, dated 18 September 1849, signed 9 July 1849. The dasher was held by a sliding bolt and wedge so it could be withdrawn; the gudgeons and the round case were packed so the cream could not get into it; a fourth pulley kept the belt's sides from rubbing. He claimed making the beaters of revolving churn dashers to turn upon their own axes. **Honest limits.** Printed gears stand in for his belt and pulleys, as he allowed; our gears are open to the cream, where his were inside a packed case. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Vifaa

11

Zana Zinazohitajika

11

Faili za muundo

8

Mchoro huu unatengeneza

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Kishikilia nafasi

Chombo cha kusukia siagi

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

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