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Propeller-and-Spoon Egg Beater: Spoon Arms Break the Swirl
A turning beater soon sets the whole liquid circling with it.
William T. Nicholson of Providence, Rhode Island, received US 32,886, dated 23 July 1861, for an egg beater: a crank wheel with bevelled face teeth turns a pinion and a pair of propeller blades; under the pinion a disk with an elliptic groove rocks two arms ending "in the form of a spoon bill's beak," so "the circling currents occasioned by the blades of the propeller will be broken at regular intervals." It clamps into a socket on a table or lifts out for use by hand.
This rung works out the stroke rates, then prints the crown wheel, pinion, cam and propeller, builds the frame and arms, and times a beating.
Advanced
About 5 hours, plus printing
Instructions
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Stroke rates
Stroke rates
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A crank wheel and pinion before it
A crank wheel and pinion before it
The embedded blueprint drives two beaters off one wheel. Nicholson drives a propeller and lets a cam rock two spoon arms against its swirl.
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Read US 32,886
Read US 32,886
"To the under side of the pinion E is secured the disk H (Fig. 5,) its lower surface being furnished with an elliptic groove or channel I. Two arms K K pivoted to the handle at c and d extend to the bottom of the propeller blade their lower extremities being in the form of a spoon bill's beak. A projecting ear e, e on each arm is inserted in the elliptic groove I whereby as the propeller shaft F is rotated to which the disk is attached a reciprocating motion is given to each of the arms."
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Print the gears, cam and propeller
Print the gears, cam and propeller
Print the 48-tooth crown wheel (/uploads/blueprints/propeller-spoon-egg-beater-crown-wheel.stl), the 12-tooth pinion (/uploads/blueprints/propeller-spoon-egg-beater-pinion.stl), the cam disk with its elliptic groove (/uploads/blueprints/propeller-spoon-egg-beater-cam.stl) and the propeller (/uploads/blueprints/propeller-spoon-egg-beater-propeller.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls.
Materials for this step:
PETG Filament1 pieceTools needed:
FDM 3D Printer5
5
Frame and wheel
Frame and wheel
Cut a plywood handle frame. Bolt the crown wheel to it on an M5 screw with a crank near its rim, and drill a bearing for the propeller shaft so the pinion meshes the wheel's face.
Materials for this step:
Plywood Sheet1 piece
Machine Screws1 piece
Flat Washer1 piece
Hex Nut1 pieceTools needed:
Coping Saw
Cordless Drill
Drill Bit Set
Adjustable Spanner6
6
Shaft, cam and propeller
Shaft, cam and propeller
Epoxy the pinion, then the cam under it, on a 5 mm rod through the bearing, and the propeller on the rod's foot.
Materials for this step:
Mild Steel Rod1 piece
Two-Part Epoxy1 pieceTools needed:
Hacksaw
Bench Vise7
7
Spoon arms
Spoon arms
Bend two arms of stainless wire with a spoon-shaped flat at the foot. Pivot each on a screw in the frame either side of the shaft, and bend a short ear on each into the cam's groove.
Materials for this step:
Stainless Steel Wire1 piece
#8 x 1" Wood Screw1 pieceTools needed:
Round-nose Pliers
Flat-Nose Pliers
Screwdriver Set
Digital Caliper 6-Inch8
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The patent drawing
The patent drawing
US 32,886 drawing sheet, public domain (expired patent).
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9
With and without the arms
With and without the arms
Beat two egg whites with the arms in the groove and time them to stiff peaks; lift the ears out and repeat with the propeller alone.
Materials for this step:
Egg4 piecesTools needed:
Stainless Steel Mixing Bowl (Large)
Stopwatch10
10
Arms that jam, a cam that throws them
Arms that jam, a cam that throws them
Propeller-and-spoon egg beater troubleshooting.
Flow
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History and honest limits
History and honest limits
**William T. Nicholson** of Providence, Rhode Island, received US 32,886, dated 23 July 1861. The grooved disk is set with its longest diameter in the same plane as the propeller blades, so the arms clear the blades; the socket or chair fixes to a table by spurs and one wood screw, its inclined sides grasping the handle, which can be lifted out for use by hand. He claimed the reciprocating beaters combined with a revolving beater.
**Honest limits.** FDM prints hold food in their layer lines, so wash well and replace when worn. A crown wheel and spur pinion stand in for his bevelled wheel, and a plywood frame for his handle and socket. Your times are the result.
Materials
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Tools Required
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