Category Archives: Objects

Shapeoko: Part 3

Naturally, this post is a follow-on to Shapeoko: Part 1 and Shapeoko: Part 2. I’ve basically put the machine together now, and can move the X and Z axis around from the host computer, but still have to figure out belt attachments for the Y axis, and run the wiring in a sane way. I was holding up a microswitch to the various relevant spots for end-stops as I went, and everything but detecting the upper extreme of the Z axis should be easy. As in the last two posts, there is an assembly gallery under the fold.

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Shapeoko: Part 2

This continues from where I left off in my previous post Shapeoko: Part 1.

I alternated my Sunday afternoon/evening between tackling my grading backlog and building pieces of the Shapeoko. This pattern works well for tapping since they are both exceptionally tedious tasks, but in different ways. Gallery with captions below the fold:
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Shapeoko: Part 1

My Shapeoko kit arrived from Inventables while I was away at SC.

I’ve been trying to build myself a small CNC milling machine since 2009, and contemplating it for longer than that. It became clear that my original design, however educational, was a dead end sometime last year. I’d been idly watching the Shapeoko project for some time as it had similar aspirations to my design, and a couple months ago I was in a particularly mechanical mood when I saw that a batch had reached enough buyers to be produced, so I bought in for a mechanical kit to mount my existing electronics on.

The Shapeoko community is really excellent, and the kit was designed to be flexible, so I’m starting off with some suggested modifications – I’m using NEMA23 motors instead of the usual NEMA17 on the X and Y axis, because I already had some nice Lin Engineering 130 oz-in NEMA23 motors and the frame can fit them. I’m configuring for dual Y motors, which give more even force across the Y axis, and routing my belts on the outside of the frame, since I needed to buy different hardware for the NEMA23 motors anyway and this particular modification is widely recommended.

There is a gallery to document my first round of assembly below the fold (captions don’t display properly in the RSS feed).
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ThruNite Lights

ThruNite T10 and Ti flashlights, with a quarter for scale.

I recently decided I wanted a “reasonably nice flashlight”, and discovered that “nice flashlights” are objects of serious obsession. Originally I was planning to just throw something attractive in to an Amazon or DealExtreme order, but then I started reading reviews from EDCForums and CandlePower, and… uh… this happened. The important thing I leaned is a lot of lights have ridiculous tacticool features, like dazzler or SOS blink modes, or design features to improve their use as a Kubotan and damage whatever touches them in a pocket or bag, and set out to avoid such things.

Eventually I found my way to BudgetLightForum where interested people who do not think it is reasonable to drop hundreds of dollars on flashlights reside, and based on feedback there, decided to try the combo deal ThruNite had running to get a AA T10 and a AAA Ti for $30 for the pair.

They showed up today (in nice packaging) and are rather interesting, so pictures and text below.
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As a fun aside to the previous post, there is a story my parents like to tell from my childhood, which generalizes the kind of permissive learning objects learning computers are an instance of. When I was very little, I … Continue reading

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Raspberry Pi

I finally got my Raspberry Pi yesterday, and wanted to ramble about it for a bit under the fold.
My Raspberry Pi
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The WiFi Common Ancestor

WaveLAN PCMCIA Card

We’ve been doing some parts closet cleaning along with the sysadmin types in our building on campus, and I spotted an original AT&T branded WaveLAN PCMICA card (Model 3399-K2624) in one of the bins. These are the precursor to all modern wireless networking devices – they don’t just predate the 802.11 standards, but were actually the contributed technology that eventually became the basis for the standard – I love computer history artifacts, so I had to play with it.

Sadly, the wavelan and wavelan_cs Linux drivers were demoted to staging in 2.6.33 in 2009 (commit) and removed in 2.6.35 in 2010 (commit… gods I love well documented F/OSS projects).

This is eminently reasonable, since it is non-standard in every way, and I may be handling one of the only remaining functional examples – assuming it is fully functional. I tried to verify with some LiveCDs of suitable vintage, but inserting the card either errored the module on load or crashed the machine… which is probably why it was removed from the kernel. It’s still a neat artifact and will be getting tucked away with my odd vintage machines.

Internals of the EAM

While I had it out I opened it up (Imagine! Opening a consumer device without having to pry the fucker apart with spudgers while praying to whatever gods you believe in that none of the tabs break.) The picture above is the “EAM” (External Antenna Module) pulled apart. There isn’t too much to see among the RF cages, but the fact it is assembled with the wire harness apparently hand soldered into a row of machine pins is amazingly quaint, and the fulls-scale R/F parts are awesome.

I’m pretty enamored of the industrial design on this thing – it looks like an important transitional device. It is the dull gray that was common on (especially AT&T) computer equipment in the 80s, which has grown even uglier with UV yellowing, so the color, logos, and sharp edges look like it crawled out of the 70s, while the rounded accents, domed round indicator LEDs, and darker molded stress relief look surprisingly modern.

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OpenWRT

I’ve been using various consumer routers hacked with dd-wrt both at home and on campus for years, and was shopping for a new one to use in the apartment I’ll be moving in to in a couple weeks, only to discover that the desired feature set wasn’t possible with dd-wrt. In particular, I wanted 802.11n, Gigabit Ethernet, USB printer sharing, and the ability to share an ext4-formatted USB hard disc via SMB and SSHFS. Hardware with the requisite bits isn’t too hard to come by, but no stock firmware supports the range of printer and storage features I wanted (and most of them are missing basic features and/or just plain suck). DD-WRT isn’t a solution, because it uses ancient kernels that don’t support modern file systems. I figured since OpenWRT was well spoken of and claimed to do everything I wanted when coupled with suitable hardware I would give it a try, and picked up a TP-Link WL-1043ND based on reviews and price, and followed the Wiki Instructions to flash it from the web interface.

This turns out to have been an excellent decision, because not only are the basic packages in OpenWRT a good five years newer than in in DD-WRT, it turns out to be superior in virtually every way. The OpenWRT documentation isn’t as inviting as DD’s, but the install process is no more complicated, the Web GUI is better laid out and more responsive, and features can be easily added and removed with a well-designed, well-integrated package manager (opkg). I’m aware that DD-WRT supports ipkg, but it has always felt hacked on and never worked terribly well for me, but opkg just works on OpenWRT. It even has a friendly Web interface for managing packages. Even the warning about the stock WL-1043ND image not coming with the appropriate WiFi modules is apparently out of date, because everything was already in place.
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Skateboarding Companies are the Best

One more longboarding post before I return to my usual content. We’re all used to being regularly mistreated by vendors, and I don’t want to sound like an SEO bot, but these guys deserve recognition for being awesome.

Free Churchill Deck
When I ordered my Jasmine from Churchill Mfg., I sent in my reddit user name for their “free skate tool with order for redditors” promotion a couple hours after I ordered. It didn’t show up in the order, and I didn’t worry about it, because worrying about free pack-ins is silly. Then I got an email from Troy Churchill apologizing for not sending me free stuff because they shipped my order before they saw I had sent in for the promotion.

I replied that it wasn’t a problem and threw in a link to my post about setting up the board. They 1. Looked at it, 2. Politely offered a slight correction and, 3. Offered me a free deck under the “give us a shout-out in a video of decorating your Churchill deck and get one free” promotion they are running, even though it wasn’t a video.
So now I have a free Marina (pintail) coming that I’m passing to a friend who rode my boards and decided she liked it, to spread the stoke.

Khiro Makes it Right
I orderd a Khiro Angle Wedge Riser Rail Kit from Daddies to play with the ride of my decks, and this happened:
Riser Problem
(There was a slight packing error among the 16 similar looking plastic bits in the set, so I had three 7° risers and only one 10°.)
I emailed a description of the problem the service contact at Daddies’, asking how they wanted to handle it… and in less than 12 hours, I was CC-ed on an email from a Daddies employee to Khiro, had an apologetic email from Khiro promising me that a replacment 10° riser was going in the mail with “some goodies,” and a voicemail from Khiro Bob apologizing for the problem. A few days later this showed up:
Riser Solved

Why can’t all the compaines I interact with be this full of win?

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Churchill Jasmine

Complete
I’ve been fairly in to Longboarding this spring, and decided to pick up another board, set up to contrast with my current big surfy cruise/carve deck. I wanted something lower, with a bit of flex, easier to break out wheels, and a less popsicle-stick shape. The intention is for variety, for easier to pushing, and to improve my technical riding. It will also be nice to have a deck to lend out to get friends hooked.
Details of the board are attached to the images of the gallery after the fold. Fair warning: they are rather high resolution. I’m sure my advisor would complain about the superimposed images with ill-matched white balance and squirrely focus, but I’m shooting with my phone and making automated fixes only in the gimp, so they will do. The WordPress gallery software also seems to be a bit confused by the non-4:3 shapes.
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