learning the ropes

things I made at ITP and after: sketches, prototypes, and other documentation

Wednesday, April 2, 2008

Designing “With” Constraints

Today has been another marathon CAD session.

I created the electronic compartment cover (which is subject to change depending on the final contents). I’m waiting to hear back about milling the parts before I make any more changes. I expect that there will be some finessing to do once I build up another encoder board. Although it is tempting to start pushing towards ready-built solutions like those found at Acroname or switching over to an optical mouse encoder system, it’s too late in the game to try new stuff that might not work even if it might ultimately make my life easier. I have a working system now that will serve me until the next phase of this project.

Complete Pulley and Encoder Assembly - transparent

Alibre Design Xpress is powerful and pretty easy to use. One of the coolest features is the way “assemblies” work. One I sketch individual parts, there are tools for “gluing” and aligning the parts together so the form an assembly.

Unfortunately, it is also easy to get lost in the miles and miles of faces and edges. Also, it is a tool that, at least for the present. has “obsession potential” for me. I was like this with Google Sketchup, too, when I was learning it. My tendency is to become obsessed with figuring out how to do something when I run into an obstacle — and ignore time limits I might place on my work. This is something I must avoid falling into in these final weeks, when the focii are going to be the performance, the presentation, and the paper.

posted by Michael at 11:42 pm  

Wednesday, April 2, 2008

Close to Fabrication

Yesterday, I alternated between programming and 3-D modeling. I’ve assembled most of the components for the pulley supports. It has taken probably 8 hours in total to build this 3-D model. I ended up recreating the assembly this morning because some of the constraints I created on the previous assembly prevented me from moving the pieces around.

In some ways, this looks pretty similar to the mode I drew in SketchUp almost two months ago; however, this model has 3-D models of actual parts that I will purchase this week and the dimensions are exact.

I still need to create a design for the housing that covers the encoder, but that is a job for this afternoon/evening.

Complete Pulley and Encoder Assembly - front edge

Complete Pulley and Encoder Assembly

Complete Pulley and Encoder Assembly - front slice

posted by Michael at 10:40 am  

Tuesday, April 1, 2008

Am I a Drawing Machine?

This is a test video of one of my first large drawings. I purchased a graphite stick at Dick Blick with the intention of making big marks. I really wanted a marker, but they only had blues and violets. I’m not so much into colors yet, so I decided to keep things simple and raw. I’ve made a conscious effort not to think while making these drawings. I try to allow my hand to guide the drawing and my eyes to observe so that my hand can respond to the feedback it’s receiving from my eyes.

posted by Michael at 12:44 am  
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