Ex07 Analog Machine






Iteration 14:

Assume vertical position B

Insert armature as drawing apparatus w/ up to 4 pens

Nail a 9 square grid into drawing

Experiment with different armatures

scan_2016-10-17_12-43-09-06 scan_2016-10-17_12-43-09-01 scan_2016-10-17_12-43-09-02 scan_2016-10-17_12-43-09-03 scan_2016-10-17_12-43-09-04 scan_2016-10-17_12-43-09-05

Iteration 13:

Assume vertical position B

Insert armature as drawing apparatus w/ up to 4 pens

Nail different points into drawing

Experiment with different armatures

scan_2016-10-17_12-43-09-01 scan_2016-10-17_12-43-09-02 scan_2016-10-17_12-43-09-03 scan_2016-10-17_12-43-09-04 scan_2016-10-17_12-43-09-05 scan_2016-10-17_12-43-09-06

Iteration 12:

Assume vertical position B

Insert Pen-Nib as drawing apparatus

Add section line as a cut 2×4 Using wire bent blockers.

scan_2016-10-17_12-43-09-01 scan_2016-10-17_12-43-09-02 scan_2016-10-17_12-43-09-03 scan_2016-10-17_12-43-09-05 scan_2016-10-17_12-43-09-04 scan_2016-10-17_12-43-09-06

Iteration 11:

Assume vertical position B

Clamp MDF sheet onto drawing

Experiment with different obstacles

scan_2016-10-17_12-42-16-02 scan_2016-10-17_12-42-16-03 scan_2016-10-17_12-42-16-01

Iteration 10:

Assume vertical position B

Insert Pen-Nib as drawing apparatus

Drop ink onto reservoir whenever dry

scan_2016-10-17_12-42-16-01 scan_2016-10-17_12-42-16-02


Iteration 09:

Assume vertical position B

Insert 3X small wire-bent V’s

Face opening away from trajectory of pen

scan_2016-10-17_12-42-16-04 scan_2016-10-17_12-42-16-05 scan_2016-10-17_12-42-16-03 scan_2016-10-17_12-42-16-01 scan_2016-10-17_12-42-16-02

Another version:

Assume vertical position B

Insert 3X small wire-bent V’s

Face opening towards from trajectory of pen



Iteration 08:

Assume vertical position B

Attach rubber band between midpoints of both spring steel arms

Tighten one side while releasing the other

scan_2016-10-17_12-42-16-01 scan_2016-10-17_12-42-16-02 scan_2016-10-17_12-42-16-03

Iteration 07:

Assume vertical position B

Attach circle offset onto pen

Nail points into most traveled paths

scan_2016-10-17_12-42-16-02 scan_2016-10-17_12-42-16-03 scan_2016-10-17_12-42-16-04 scan_2016-10-17_12-42-16-05 scan_2016-10-17_12-42-16-01

Iteration 06:

Assume vertical position B

Attach triangle offset onto pen

Nail points into most travelled paths

Iteration 05:

Assume vertical position B

Attach scalloped offset onto pen

Nail points into most traveled paths

scan_2016-10-17_12-42-16-03 scan_2016-10-17_12-42-16-01 scan_2016-10-17_12-42-16-02 scan_2016-10-17_12-42-16-04



Iteration 04: 

Assume vertical position

Change the angle +5 degrees each iteration

scan_2016-10-17_12-42-16-03 scan_2016-10-17_12-42-16-01 scan_2016-10-17_12-42-16-04 scan_2016-10-17_12-42-16-06 scan_2016-10-17_12-42-16-05 scan_2016-10-17_12-42-16-02



Iteration 03:

Assume vertical position B

Insert z extension arm to drawing arm end

Attach line to triangulated points on different wheels

Iteration 02:

Assume vertical position B

Tap upper arm

Experiment with different BPM

scan_2016-10-17_12-42-16-01 scan_2016-10-17_12-42-16-04 scan_2016-10-17_12-42-16-02 scan_2016-10-17_12-42-16-03

Iteration 01

Assume vertical position B

Attach pendulum to bottom of drawing arm

Experiment with different weights

scan_2016-10-17_12-42-16-02 scan_2016-10-17_12-42-16-01




Here we added a rubberband to the system the coiled up in the motor drive wheel, Ended up coiling up faster than desired to pull the arm before the Spirograph was completed.


Motor was running too slow to get the type of movement out of the spring steel that we wanted, Ended up running the machine by disengaging the motor wheel and spinning by hand as consistently as possibly for about 5 minutes at something more like 200 rpm.



Here we just drilled a hole into the end of the arm for a pen or a pencil, Found that ballpoint works best.


How the disk spins on a shoulder bolt which is tight to the mdf base.


Embedded Hex nuts to change arm length and location on disk.



Spirograph Version 2: Now using latex tubing as drive bands, Still using same spring steel arm as mentioned before. Whole system run off 9 rpm motor, very slow. The motor is having trouble running the system due to the weight of the wheels.

img_7662 img_7674 img_7673 img_7678
Creating a motor mount that has isn’t fully solid to allow for air to cool the motor. 3D printed connecting piece from motor into laser cut wheel. Showing the bottom side which engages with the motor. Motor mount is bolted to the bottom of the mdf base and the wheel is put on top.





Our first version of the Spirograph. Two wheels held in ratio by a bike tire belt. One of the arm is broken up into 3 segments with 2 “soft segments made out of 0.015” spring steel.


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