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Planetary Stand Mixer
Herbert L. Johnston, Thomas F. Rataiczak · Public domain (expired patent)
YourGrandma

Nilikha ni

YourGrandma

22. Setyembre 2026IS
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Planetary Stand Mixer

The rotary egg beater already published spins two blades on fixed axes - so the cook must keep moving it, and a stiff dough stalls it. Herbert Johnston, an engineer at Hobart, watched a baker turning dough with a spoon and built the next rung: the beater turns on its own axis while a carrier walks it round the bowl, so the blade sweeps everywhere without the bowl or the beater being moved by hand. **US 1,264,128**, "Mixing-machine", Johnston and Rataiczak, assigned to Hobart Manufacturing, filed 1. March 1915, granted 23. April 1918. Hobart's big bakery machines came first; the domestic KitchenAid followed in 1919. **You build the motion, not the appliance**: a planetary gear set with a pen for a blade, drawing its own path on paper, and a coverage measurement against a fixed-axis beater.
Katamtaman
3 hours

Mga Tagubilin

1

Read the gear set

Count the teeth on the ring and on one planet. Measure the ring's inside diameter and a planet's outside diameter with the caliper; the pitch radii are close to half of each.

Mga materyales para sa hakbang na ito:

Set ng planetaryong gear (asero)Set ng planetaryong gear (asero)1 set

Mga kailangang kasangkapan:

Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
2

Mount it over paper

Screw the ring gear flat to a plywood board. Tape graph paper under it, centred. Fit one planet so it rolls inside the ring.

Mga materyales para sa hakbang na ito:

Plantsa ng playwudPlantsa ng playwud1 piraso
Papel na GrapPapel na Grap1 pilyego
Teyp na pantakipTeyp na pantakip1 rolyo

Mga kailangang kasangkapan:

Lagaring PangkamayLagaring Pangkamay
Walang-Kableng BarenaWalang-Kableng Barena
3

Give the planet a blade

Glue a short dowel upright in a hole in the planet, four-fifths of the way out from its centre, and tape a marker to it so the tip just touches the paper.

Mga materyales para sa hakbang na ito:

Kahoy na TarugoKahoy na Tarugo1 piraso
Pangmarkang Hindi NabuburaPangmarkang Hindi Nabubura1 piraso

Mga kailangang kasangkapan:

Baril ng mainit na pandikitBaril ng mainit na pandikit
4

Walk it round

Push the planet slowly round the inside of the ring, letting it roll rather than slide, until the drawn pattern closes on itself. Then draw, for comparison, the circle the same blade makes when the planet is held in one place and simply spun.

Mga kailangang kasangkapan:

RulerRuler
5

The same in dough

Optional but convincing: put 200 g of flour and 120 ml of water in a bowl and stir with a fixed-axis beater without moving it. Note the untouched ring of dry flour at the wall - the reason for the carrier.

Mga materyales para sa hakbang na ito:

Karaniwang harinaKaraniwang harina200 g

Mga kailangang kasangkapan:

Malaking mangkok na salaminMalaking mangkok na salamin
Digital na Timbangang PangkusinaDigital na Timbangang Pangkusina
6

Path, coverage and gear ratio

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7

History & Context

**What the patent specifies:** a mixing machine in which the beater rotates about its own axis while being carried bodily around the bowl. **Modern build (derived):** a planetary gear set and a pen, which draws the path the blade takes. The 20-gallon Hobart was standard in large bakeries by 1915; the domestic version arrived in 1919 and the layout has not changed since. Its limits: the gearbox must take dough loads, the bowl must match the beater's reach, and a blade that reaches the wall will also scrape a bowl that is out of true.
Hakbang 7 - Image 1

Mga Materyales

7

Mga Kinakailangang Kasangkapan

7

Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

Rotary Egg Beater

Rotary Egg Beater

ni YourGrandmaIS

PAGKAIN AT INUMIN

42
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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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