Motion Solution for MA Sculpture Student

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Discussion Overview

The discussion revolves around creating a rocking motion in a sculpture made of wood, specifically a 7x7x60 cm solid wooden curve. The focus is on the mechanism to achieve this motion, including the use of motors and other components, while ensuring the locomotive mechanism remains hidden within the sculpture.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests using a small motor to power an egg-shaped disc that tips the beam into a rocking motion when the tip touches the ground.
  • Another participant raises concerns about friction between the disk and the surface it pushes against, proposing alternatives such as using another disk or roller to reduce friction.
  • A suggestion is made to balance the structure like a see-saw by moving the center of gravity instead of relying on direct contact with the ground.
  • One participant proposes placing the battery and motor in one arm of the sculpture, using a drum cam or reversing linkage to create a rocking movement by altering the center of gravity.
  • Another idea involves using a linear actuator or solenoid to move a weight suddenly, creating a rocking motion that could be complex and unpredictable.

Areas of Agreement / Disagreement

Participants present multiple competing views on how to achieve the desired rocking motion, with no consensus on a single solution or approach. Various mechanisms and configurations are proposed, each with its own advantages and challenges.

Contextual Notes

Limitations include the need for sketches or drawings to better understand the sculpture's design and how it is displayed, as well as the dependence on the specific size and shape of the components used in the mechanism.

Dylan
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I am an MA sculpture student. i want to put motion into a piece i am working on. It involves a 7x7x60 cm solid wooden curve that's made of pine and wood glue in a ply-like style. Its curve means that either ends are aprox 40cm from the ground. I would idealy like to display the piece on the studio floor.
I want to cause a rocking motion in it, but make it so the locomotive is unseen, inside the curved beam, perhaps in a dug out hollow. Therefor it needs to be battery powered.
My tutor has surgested to me to use a small motor to power an egg shapped disc to rotate, tipping the beam into a rocking motion every time the tip of the egg shape touches the ground.
Is this a good solution, and what components would i need to create such a circuit?
Any help on the subject would be hugely appriciated, I'm currently studying in Paris and don't speak french well enough to relay my concept to anyone helpfull.

I just added photos of the piece so for, hope this helps.
 

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It would help if you could post a sketch of what the sculpture looks like and how it is displayed. For example is it on the ground, on a table or a stand, suspended from the ceiling, etc...

One problem with your idea is that there may be friction between the disk and whatever it is pushing against as it tries to rotate. You could fix that by making the disk push against another disk or a roller that was part of the stand for the structure.

The disk idea could also work without touching anything, by moving the centre of gravity if the structure was balanced like a see-saw.

You would need a battery, a motor, probably a large ratio gear like a worm gear to slow down the motion, and an on/off switch.

How much motion you could get depends on the size and shape of the thing and how it is supported, so without a drawing it's hard to make any more comments.

EDIT: In case it's not obvious to new readers of ths thread, I posted this before seeing the pictures.
 
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I would suggest placing the battery and motor in one arm of the thing, connected by a drum cam or other reversing linkage to an equal weight in the other arm. Moving the weight farther in or out on the linkage will alter the centre of gravity and cause a rocking movement.
 
Another idea would be to use a linear actuator (e.g. a solenoid) inside the object, to move a weight suddenly between two positions. That would give you a rocking motion which would die away slowly after each move. If the electrical circuit flipped the weight back and forth at a suitable frequency, the motion could be quite complex and unpredictable - in fact, chaotic, in the mathematical sense of the word.