Monthly Archives: November 2012

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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SC12 Impressions

I’ve got my pictures from the event up in an album in google’s cloud.

Here are the big, cool things I learned on the floor or at the various evening events:

  • Xeon Phi. Xeon Phi everywhere. Intel may have backed off on Larrabee, but the MIC descendants are proliferating quickly, and appear to actually be in use. They really are interesting parts – 60 node Linux x86 SMP box attached to a host system over PCI Express via a network-like interface. Somewhere between a tiny desk-side cluster and a GPU with a programming model you can actually use.
  • The population was much less male dominated than is typical for computing events. This is always a good thing.
  • The average age of attendees also seemed to be down by the better part of a decade.
  • The national labs losing their booths to the government-wide travel restrictions (apparently some folks went junketing in Vegas and it was that bad) changed the feel of the floor. Fewer, but longer and deeper conversations. More open layout, because many of the usual big constructed booths belong to the national labs. Users from the national labs hanging out at vendor’s booths. Not altogether a bad thing, but it was quite different.
  • ARM64 (aka aarch64, aka ARMv8). It is happening. It is odd (64KB pages, etc.). Large companies are being bet on it. We’re talking many billions of dollars, biggest bet since Itanium kind of big. The priority seems to be avoiding the Itanium mistakes, making sure the designs arrive promptly, and making sure software support is ready. Dell is talking quietly, Calxeda is gunning for it, Nvidia was showing (but only quietly) plans, AMD is being pointed to as a likely leader, and ARM was is sitting in their little 10×10 booth along one wall of the exhibit floor looking very pleased with themselves.
  • AMD is dying. The untimely (and vigorously denied) rumor that they hired J.P. Morgan to begin plans to sell part or all of themselves made it look even worse, but they had almost no presence on the floor, and scheduled a tiny booth next year.
  • We talked to a number of networking vendors making interesting things (free-air optical switching, multi-port Ethernet NICs, etc.). Infiniband is so good and so cheap (in a relative sense) for cluster applications right now that everyone else is hunting for an edge. This is a good thing for researchers.

There will be at least one more SC12 post later, when my cube of schwag arrives. The T-shirt harvest was great this year…

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SC12

I will be at SC12 November 10-16, with the Aggregate.org/University of Kentucky exhibit in booth 631.

I will be posting pictures and impressions through at least one of my online presence mechanisms . I fully expect it to be weird this year with a bunch of the national labs pulled out due to travel restrictions, but it should be interesting.

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