Design, Build, Test, Iterate

Archive for July, 2011

Solidworks: Even More Satisfaction!

In addition to the welding class, I took a CAD/drafting class at LBCC that taught how to use Solidworks. I 3D-printed myself a keyfob. There’s not much to say about Solidworks other than that I learned how to use the various tools within the program and just drew. The program itself is just a tool, […]

Satisfaction: I can weld! (MIG and stick, anyway)

I took some welding classes at Linn-Benton Community College a few weeks ago. I was most surprised by the fact that electricity is involved. I’d always thought that the metal was heated by a flame, but it’s actually heated by a massive arc between the welding metal (for lack of a better term) and the […]

Tricopter: Progress?

The code involves a lot of math that I don’t understand! They never taught rotation matrices in high school. This post is just to share that I haven’t fallen asleep or anything. Okay, more honestly, I’ve just started coding again after a month of chemistry. It was still fun! Check out my (slow) progress on […]

HP LaserJet 2100 + CUPS

I bought: A used HP LaserJet 2100 on eBay for $25, including shipping. A C4096A toner cartridge on eBay for $8, including shipping. A USB to parallel 1284 cable (36-pin, not 25-pin!) from Amazon for $4, free shipping. Configuring CUPS The printer showed up as /dev/usb/lp1. CUPS automatically detected this as cnijusb:/dev/usb/lp1, but no matter […]

DIY PCB Etching: Test Run

I found some one-sided blank PCBs on eBay. They are only half as thick (0.0225″) as the ones found in most electronic devices, but I don’t need much more yet. I cut the board by gouging out one side of a small rectangular area with an exacto knife until it was thin enough to be […]

DIY PCB Etching: Safety Lessons Learned

I wondered for a while about the title of this post, because I have actually learned very little in terms of safety. After all this, I know I’m still not going to use a fume hood, I’m still going to do this in my garage (albeit closer to the door), and I still won’t wear […]

DIY PCB Etching: Not Electrolyzing Salt to Make Cupric Chloride

The tutorials use hydrochloric acid and hydrogen peroxide as the starting etchant not because they aren’t adventurous but because that is what works best (as opposed to using electrolysis). The starting etchant (hydrochloric acid and hydrogen peroxide) Once again, the starting etchant provides chlorine that will oxidize copper to form cupric chloride: Hydrochloric acid is […]

Ceramic Hand

I found the ceramic hand I made in my high school’s ceramics class two years ago. If I recall correctly, it took me about 12 hours to mold by hand. I tried to make it look as if it was fingering chords on a violin, but it got deformed a bit as it dried. Even […]

Using Mailman with multiple domains

This is something that has been bugging me for a while. Our robotics team owns both cvhsrobotics.net and cvhsrobotics.com. I don’t know if this is actually true, but it seems that the .net is the domain we publicize. On the other hand, for some (or no) reason, our mailing list uses the .com domain. This […]

DIY PCB Etching: Collecting Chlorine Gas (Read: DON’T)

tl;dr: There are much more efficient ways in which to produce chlorine gas than by electrolysis, so stop hoping and go buy some hydrochloric acid. I ultimately did not achieve anything practical by producing the gas. This post is only a log. Accidentally oxidizing my cuprous chloride solution Technically, it’s possible to turn a cuprous […]