things to say…

About me:

I am lu lyu, a kinetic artist and automata lover.

My website: lulyu’s art

Our goal of this session:

our tool:

I love Motiongen a lot!

MotionGen is a planar mechanism design and simulation software part of SnappyXO Design suite of products developed by Stony Brook University and Mechanismic Inc. with the funding from the National Science Foundation via STTR Phase I and Phase 2 awards.

They also have their kits sold here: SnappyXO

My personal workflow will be motiongen -> cardboard -> fusion 360

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Terms.. The code of linkages

• Fixed pivot and Moving Pivot

  

• R

  the revolute, or hinged

• P

  the prismatic, or sliding

• Degree of Freedom

  • dof=0
  • dof=1
  • dof=2

• Crank and Coupler

  

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Assignment1:

Create a four bar linkage! in MotionGen.

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Four Bar Linkage

what is four bar linkages?

Four bar linkage is everywhere!

Four Bar Linkage Explain a video showing different four bar linkages

Grashof’s Law a video explaining a formula that would result in different behavior move of a four bar linkage

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Get advanced on linkage design

• Four bar linakge is a RRRR

• RRRRR

  Add another driven R.

  

• RPRR

  

• RRRP

  

Combination

• RRRR+RRRR

  

• RRRR+RRRP

  

• RRRPRRR

  

• RPRR+RRRR

  

  placing a cube

• 2 bar between 2 driven points

  

Using lever

• REVERSE MOTION LINKAGE

  

• PARALLEL MOTION LINKAGE

  

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Assignment2:

Try to design a linkage system in motionGen

- encourage a simple concept

- hint: try to draw some shapes and attach shape to linkages

inspirations

The Holy 11 numbers

a science fiction article about this 11 numbers

11 numbers

a = 38, b = 41.5, c = 39.3, d = 40.1, e = 55.8, f = 39.4, g = 36.7, h = 65.7, i = 49, j = 50, k = 61.9, l=7.8, m=15

STRANDBEEST by Artist Theo Jansen

The Peaucellier–Lipkin linkage

The first planar linkage capable of transforming rotary motion into perfect straight-line motion

In Wikipedia there is Mathematical proof of concept

Watt parallel motion

bio inspired linkages

linkage mechanisms in animal joints and related bioinspired designs pdf view link

Why the beak of birds are curved and how birds could control the end of their beaks. they controlled it by moving their maxilla

Other linkage related artwork or examples

tickling fox

an automaton horse

Archer Automaton

a flower clock

an ox

Tenfold

CARDBOARD time

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design a linkage system. Then prototype it with cardboard.

Artwork Analyse

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bob potts pursuit

Look at the video and analyse the linkage system.. rebuild it in Motiongenpro.

My explaination video: Linkof a video linkage design workshop 2

other readings

Linkage can draw all the curves mathematically… 中文视频 sorry I didn’t find a better video in English

Degree of freedom Formula

reverse and parallel photos credit here

Discussion, Questions