Archive for the ‘Uncategorized’ Category

4 Bar Linkage: Part 1

Monday, July 27th, 2020


Linkages are hard.  I think they are powerful mechanisms, I just find them difficult to visualize and time consuming to iterate. I’ve been thinking about a device that could turn and push a small wooden block over and over again, and I fear a four bar linkage may be the answer.


I saw a great video from Disney Research on creating animated mechanical characters. Their software appears to be proprietary, but it was a great starting point. Then I found an incredibly useful 4 bar linkage simulator from Mechanical Expressions. Thanks to this simulator, I quickly dialed in the desired motion and got my linkage dimensions.


Drew up some designs.

linkage designs

And milled some parts.

The first prototype is a hand cranked 4 bar linkage built from aluminum and delrin parts. Linkages need to be built well in order to operate correctly. There can’t be too much slop in the mechanism and precision counts. Hopefully, the second prototype will actually move a block around.

Donut Controller

Friday, April 17th, 2020


Almost done. I’ve been working on a game controller for the 9 year old daughter of a friend of mine. She programmed a donut video game in Scratch. You press the “B” key and the background changes. The “D” the donut flavor changes. “S” for sprinkles. “F” for frosting.

The game is awesome and so is she. Hope she likes it.

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Who wore it better? #donutcontroller

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Getting closer on the donut controller #Itpdevicedesign

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Motorized Mechanisms

Saturday, February 15th, 2020

Laser cut acrylic parts assembled around a geared DC motor.

What Not To Do Clock

Saturday, February 15th, 2020

Pulled together a quick clock project with Tom Igoe. Tom works on the insides, I work on the outsides. We made so many bad choices along the way, we decided to call it the “What Not To Do” Clock.

Milling Lenses

Saturday, February 15th, 2020
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After a quick polish, it appears to magnify a bit.

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I CNC’d some acrylic on the 4 axis into lens like shapes. After a polish on the buffing wheel, they actually worked.

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The lens making process

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Walnut Caster Car

Tuesday, January 7th, 2020

Made a fun little walnut Caster Car. Everything was CNC’d on the Bantam mill then sandwiched together.

Walnut Cheese Board

Tuesday, January 7th, 2020

CNC’d another cheese board. This time in walnut.

Deceptively Difficult Part

Tuesday, January 7th, 2020

This walnut part was deceptively difficult to wrap my head around. Perfect part for the 4-axis though.

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4th times the charm

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Robot Recipes: Wonder Woman

Tuesday, January 7th, 2020


Made a Wonder Woman Robot Recipe a little while back. Finally getting around to posting it.




Acrylic Inlay Eyes

Tuesday, January 7th, 2020

Whipped up some quick acrylic inlay exercises for some toys.

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Making some Cyclopes #arttoyitp

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Everything was milled on the Bantam mill.