Origami chair redesign: fixing FLW’s problem?

May 28th, 2013 by SLSolarz

Thanks for checking out my blog post!  As I promised in last week’s entry, this week I will reveal whether or not I solved Frank Lloyd Wright’s design problem.  The Origami Chair famously has a tendency to tip forward; especially as the sitter scoots forward in preparation for standing up.  Wright’s solution was to add anti-tipping feet; he added metal caps to make the extra pieces look more intentional.

This photo provides a good view of FLW's anti-tipping feet.  They are the pieces of ply with the metal tips.

This photo provides a good view of FLW’s anti-tipping feet. They are the pieces of ply with the metal tips.

My thought was to make the front feet larger, providing a greater surface area and, therefore, a lesser proportion of the sitter’s weight on the front corner of the feet.  Good idea??  I originally made the feet about 4″ long (a 25% increase from the FLW model) and then sliced off a couple of inches from the bottom of each side of the chair, doubling the length of the feet.  Result??

I still had a tipping problem.  The seated person wasn’t in any danger but the experience of getting up from the chair could still be a bit startling–not a desirable quality for a chair!

I considered tossing the chair out and moving on to another project until a fellow member of Twin Cities Maker mentioned that a chair with a tipping problem might make a great rocker.  Thus began a new design!

So, next I carved a model rocker out of polystyrene foam.

Here the foam rocker is taped to the table to approximate how it would look once attached.

Here the foam rocker is taped to the table to approximate how it would look once attached. The paint chip that I have taped to the side is a color I considered for the chair.

Determining the arc of the rockers turned out to be quite a research project.  Eventually, I found a simple formula for finding the length of the radius of the circle from which the arc should be drawn.  That is seat height x pi.  I brought my model and 2 tubes to a steel-bending expert.

One of my rockers is finishing its final bend. This machine has a limit of 2 in diameter metal.

One of my rockers is finishing its final bend. This machine has a limit of 2 in diameter metal.

Next, I made several steel plates to screw to the feet and tail of the chair so that I could connect the chair to the rockers.

Positioning the chair, just right, onto the rockers was challenging.  If there is a next time, I will get help holding the chair as I weld it to the rockers.

I propped the chair just as I wanted it to sit on the rockers so that I could design the hardware to connect the front feet.  You can see on the left that I used a plate welded to a square rod to connect the tail.

I propped the chair just as I wanted it to sit on the rockers so that I could design the hardware to connect the front feet. You can see on the left that I used a plate welded to a square rod to connect the tail.

 

Next week, I will discuss creating the exterior of the chair.

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Steel, Exquisite corpse of – Drawings needed!

May 22nd, 2013 by videoman

IMG_3852Hello folks!  We are running the art project Steel, Exquisite corpse of, at Northern Spark this year on June 8th.  When we start out the night, we need one drawing that will help inspire us for the first segment of the art piece.  The first sculpture will have a theme of underground, above ground, and sky.

We want the first segment of the sculpture to be drawn by you!  Submit your photos by tweeting to @HackFactoryMN with the hashtags of #nspk38 and #underground.  First 20 people to tweet us before June 8th with photos of their drawings will receive two LED throwies on the night of the event.  Please help support this project by donating to our Indiegogo campaign or sharing this with your friends!

Cali, Aaron, and I did a small test run of Steel, Exquisite corpse of last night, and it turned out really cool!  IMG_3862

Origami chair redesign: a plywood foundation

May 22nd, 2013 by SLSolarz

Over the next several weeks I will post photos of my rocking-chair project as it progresses.  I welcome your feedback and hope that you will help me find a name for this chair.

My design is inspired by 2 sources: the Frank Lloyd Wright Origami Chair and the Converse All Star sneaker.  I’ve always wanted to re-design the Origami Chair as an updated, cool lounger.  The Converse reference came later, after hours of observation, when it struck me (and my friend Ann who stopped by the Hack Factory for a critique session), that my placement of masking tape around the rockers was reminiscent of a pair of red sneakers (more on this in a future post).

This probably looks like a simple chair to make but there are no right angles so it was tough!

This probably looks like a simple chair to make but there are no right angles so it was tough!

A few years ago I made a large, black lacquered version of FLW’s Origami Chair and I kept one for my own home.

My original, very large version of the origami chair.

My original, very large version of the origami chair.

Using the chair at my home, I started my new chair by tracing a pattern onto poster board.  Then, I made another pattern about 2/3 the size of the large one, tweaked the proportions and used that pattern to cut the plywood.

I am interested in learning tips for sanding complicated shapes like this.  It is a slow process for me.

I am interested in learning tips for sanding complicated shapes like this. It is a slow process for me.

The seat and back are carved from spray foam and covered in body filler then sanded, more body filler, then sanded...

The seat and back are carved from spray foam and covered in body filler then sanded, more body filler, then sanded…

Once I assembled the plywood pieces I carved an ergonomic seat and back out of spray foam.  To create a smooth surface, I covered the carved foam in body filler and then did a lot of sanding.

Next week I will discuss the main design problem with FLW’s Origami Chair and whether or not I solved it.

 

Arduino 101 is back

May 20th, 2013 by danbackslide

Arduino microcontroller

 Sign up for the class at Eventbrite!

Arduino 101 is back for one one more round, just in time for summer vacation monkeying about. This will more than likely be the last Arduino 101 class until September, so if you’ve been looking for the intro course you’ll want to sign up!

This round runs on Friday nights, 5/31 and 6/7, from 7:00pm – 9:00pm

Ever wanted to make something blink or buzz, but don’t know where to start?  This is the class that will teach you the basics of what an Arduino can do, and how microcontrollers are awesome!

Cost is $50, which includes a parts kit we’ll be using in class (it’s yours to keep!). Students will need to supply their own Arduino board and laptop. 

  • The class focuses on the Arduino Uno model, but everything works with the Arduino Mega as well. The Arduino Leonardo is new and I haven’t had a chance to play with it, but I expect it’ll play nicely.
  • Arduino-compatible boards/Arduino clones might cause some issues — pin layouts may be different, and in some cases they’re not 100% code-compatible. If you already have one, feel free to bring it in, but if you’re just getting started I recommend buying an official Arduino board.
  • If you don’t have an Arduino, they’re available at most local Radio Shack stores, and also at Micro Center in St. Louis Park. Or you can check the Vend-A-Kit machine at the Hack Factory! (And of course you can mail-order one, but where’s the instant gratification in that?)
  • If you haven’t got a laptop, please get in touch. We can possibly work something out.

 

CNC Projects? Show us yours!

May 16th, 2013 by otto_pjm

Following the most recent CNC Class, which I think was a great success on many levels, I was inspired to make a project that has been on the back burner for awhile. I want to use a CNC to make some furniture. I’ve been inspired by the work of Gregg Fleishman, and as a starting point I cutout a scale model of one of his designs.

IMG_2506

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Strange Attractors Project for Northern Spark 2013

May 16th, 2013 by videoman

David Bryan, Riley Harrison, Cali Mansty, and Aaron Prust are presenting multiple projects for Northern Spark 2013 on June 8th in Downtown Saint Paul! Northern Spark is an overnight interactive festival starting at 8:58pm and ending at sunrise!  We are inviting everyone to come and hang out, and enjoy the festival!  The Hack Factory will have three spaces setup for people to come and interact with the Art.

We are also in the process of fundraising for this project, currently we need about $3,800 to help cover the costs of materials, and $4,200 total to cover rewards. We receive all funds that are pledged.

Go donate now!

So lets talk about one of the projects, Strange Attractors.  You may remember me from such things as the Raspberry Pi powered cat feeder.  While I’m at it again, and making stuff with the Raspberry Pi.  I was asked create a few blog posts for MCM that talked about the Raspberry Pi Camera module that I’m going to use in my next project.

Strange Attractor1Image credit: Alex Weber, http://www.flickr.com/people/8123185@N02/

I am creating an art piece, Strange Attractors, for the Northern Spark Art Festival on June 8th.  Read the rest of this entry »

General membership meeting 6/26/2013

May 10th, 2013 by orion

This is a reminder that in order to be a member in good standing and be able to vote you must have your dues paid by 11:59PM 6/1/2013. If you have questions about your dues status please email treasurer at tcmaker.org More info to follow…

Reminder Bump

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