The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

Month: December 2008

  • Antenna Test Range

    Renaissance Faire Free Parking Lot
    Renaissance Faire Free Parking Lot

    So we went on a trip to the Renaissance Faire in Tuxedo, NY this fall for reasons that aren’t germane right now.

    Here’s what I found most interesting: the parking lot.

    We wound up in the “free” parking lot, a goodly walk from the Main Event, as all the others were full. The lot is in a valley, that being the general terrain around those parts.

    The first thing that struck me was that the lot was suspiciously level. Walking toward the path over the hill to the Faire showed that the whole thing was paved with crushed blast-furnace slag and sported many, many concrete pads and foundations that were absolutely flat and flush with the gravel. No grass, no curbs, no drains, no nothing.

    Somebody spent a lot of money making a parking lot in the middle of nowhere dead flat and perfectly level? WTF?

    Antenna Dish
    Antenna Dish

    On our way out, I spotted the reason: it’s an old antenna test range. See the dish at the far end, aimed right down the bore of the valley? No feed structure and it seems to be covered in graffiti, so it’s out of action.

    The overview from above shows the straight dope. The Faire is the tangle of junk inside the bow of the road on the left, the antenna range is the long vertical stripe to the upper right.

    Zoom in on the valley and examine the patterns!

    I took those pictures from the left side of the valley, roughly in line with the lower X, where the paving widens.

    I thought it must have something to do with Bell Labs, but apparently it’s even weirder: Tuxedo Park.

    Now, there’s a guy with a basement shop it is to die for!

  • Laying On of Hands: Trackball Repair

    I have a pair of trackballs, one on each side of the keyboard, in the interest of dividing the strain on my wrists. The right-hand trackball, a Logitech Cordless Optical Trackman, suddenly stopped working one afternoon: the ball stops moving the pointer, the half-dozen buttons stop selecting things, the scroll wheel stops scrolling.

    I poke the resync buttons, replace the batteries, generally futz around, and discover that it’s actually working fine, but with an RF range measured in inches rather than feet. Not good; it’s on a pull-out shelf in the desk leg well and there’s no place for the receiver within a few inches. Besides, it’s supposed to work better than that.

    So I take the trackball apart, admire all the little bitty parts, reseat the ribbon cables, blow the fuzz out of the optical sensors, admit there’s not else much I can do, and reassemble it.

    Works like a champ again: I love zero-dollar fixes!

    I’m pretty sure this is Yet Another Ribbon Cable failure. Those cheap tin-on-tin connections get gassy after a few years, the resistance skyrockets, and (what with No User Serviceable Components Inside) the thing get tossed in the trash. Don’t get me started on RoHS.

    As part of all this, I discovered that desktop gadgets mostly use the 27 MHz band, with a few in the low VHF and Bluetooth at 2.4 GHz. I’d have laid money saying everything except BT was UHF, which just goes to show what I (don’t) know…

  • Using DVDs for Backups and the Futility Thereof

    Early this year I made backups of a friend’s PC hard drive on DVDs (using partimage, my full-partition-backup hammer of choice) and now must recover a file for her.

    Each of the seven DVDs has two 2 GB files on it and, on every DVD, the second file is riddled with errors.

    Thousands, nay, tens of thousands of errors.

    The first file on each DVD is perfect: zero read errors.

    I’ve tried them on three different drives and, while the errors vary, the pattern is basically the same.

    Tick me right off. I’ve had a PC running ddrescue on ’em for the last few days. I’m hoping that by reading them on various drives, the recovery program can merge the good parts, but I’m not holding out a lot of hope. (Update: worked like a champ. Whew!)

    Because I’m that type of guy, I always verify the data when I write a CD or DVD, so I know these were good when they were written. Most of the DVDs seem to be visually OK, but some have dark spots in the dye layer. There aren’t any scratches or defects beyond what you’d expect for a DVD that’s been written once and handled by somebody who’s neurotically careful about that sort of thing: they’re not pristine, but they’re not far from it.

    Also because I’m that type of guy, they’re generic no-name DVDs, but so what?

    Achtung: use the GNU version of ddrescue, because it’s the one that creates & uses a log file to help retry the errors on different machines. The other non-GNU version doesn’t do that.

    Memo to self: next time, record -three- sets of DVDs and store the sets separately.

  • Blender repair

    Blender blade bearing repair
    Blender blade bearing repair

    So a while back I replaced the blade bearings in our cheap-after-rebate Farberware blender: a $20 pack of ten bearings (5 repairs!) from eBay for a $15 mixer.

    [Update: They’re 6 mm ID x 13 mm OD x 5 mm thick.]

    Of course, it turned into a shop project. I added spacers that held the shaft in the right position by eliminating some vertical play, dripped Loctite around the housing to fasten the outer races in place, silicone-lubed the seals, and generally did the last few dollars of engineering & manufacturing they couldn’t afford in a cheap blender.

    The blender now works better than it ever did before. It used to emit a horrible whining rattle and didn’t have much go-power. Now, while it’s not silent, it whirs solidly and engages the pancake batter with a vengeance.

    Blood no longer runs out of our ears…

    I think the original bearings were crap quality, badly sealed, poorly mounted, and failed so fast we never knew how the mixer should behave. Grumble, etc.

    Now that I know what to do, the next four repairs should go much quicker. If, indeed, the new bearings ever fail. The old ones were, IIRC, “dishwasher safe”, but I think that is a cruel hoax from the Planned Obsolescence & Early Failure Department. We’re rinsing the blade assembly by hand now.

    If I thought spending more on a blender would get better bearings, I’d probably still buy cheap-after-rebate ones just for the quality shop time…

    Memos to self: left-hand shaft thread, slightly shorter bottom extension, make stainless hardware.

  • Ed’s High-Traction Griddlecakes

    Speaking of blenders and things that happen in the morning: when I manage to wake up fifteen minutes before everybody else, this is what we have for breakfast.

    Ed’s High-Traction Griddlecakes

    • 1-2/3 cup rolled oats
    • 1-1/4 cup water
    • 1 egg
    • 1-1/3 cup cottage cheese (or ricotta in a pinch)
    • 3 Tbsp almond butter (peanut butter = ptooie)
    • 1 tsp gen-you-wine vanilla extract
    • 1 tsp baking powder

    Dump everything in the blender in that order, blend until smooth, then pour on hot griddle and flip when the top sets up. Slather in honey (ideally from one’s own bees, but anything local will suffice). Serves three and keeps you full until lunch.

    Mighty tasty, but you gotta run it through the blender or it just won’t make

  • Christmas Day Ride

    Couldn’t pass it up: a family bike ride on Christmas Day in midstate New York!

    A mere 40 F and breezy, but no snow on the roads… a good time was had by all.

    Memo to self: fleece + bandanna is fine at 40 F.