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.

Author: Ed

  • Kitchen Spatula Search

    A long long time ago, we bought a kitchen spatula that’s served us well ever since:

    Spatula Search - original
    Spatula Search – original

    To give you an idea of how old that poor thing is, the back of the handle bears a Japan stamp. I’ve re-set the rivets several times, the blade has rusted as badly as you think, and we recently, very reluctantly, decided it has passed its best-used-by date.

    The 3 x 4.5 inch blade is 19 mil = 0.45 mm plated carbon steel, stiff enough to remain flat and springy enough to bend a little, with a 9 inch = 230 mm steel handle ending in a plastic overmold.

    These days, it’s essential to the cutting, flipping, and serving of the morning’s omelet-like substance, made of eggs, bacon, veggies, green leafy things, plus this-and-that, in the cast-iron pan. Mary chops the disk into quarters with the reasonably sharp edge, maneuvers the reasonably bendy blade under each quarter, flips them over, tops with bacon & cheese, pauses for consolidation & melting, then pops them onto plates. Yum!

    Omelet in cast-iron pan
    Omelet in cast-iron pan

    So we set out to buy a replacement.

    Here’s what we’ve tried and rejected so far:

    Spatula Search - overview
    Spatula Search – overview

    I’ve used this one for many years to flip pancakes on a succession of non-stick griddles, a service at which it excels. The edge isn’t sharp enough to cut the green-and-leafy and the completely inflexible blade cannot be maneuvered under the omelet quarters:

    Spatula Search - heavy solid plastic
    Spatula Search – heavy solid plastic

    This one gets deployed for burgers and their ilk, also in the cast-iron pan. The blade, although sharp enough, is completely rigid:

    Spatula Search - heavy slotted metal
    Spatula Search – heavy slotted metal

    On the other paw, a slightly concave 7 mil = 0.18 mm spring steel blade is much too thin and, well, springy. Although very sharp, you cannot apply enough cutting force without suddenly bending the blade and, if the omelet quarter isn’t positioned exactly right, the blade will bend underneath it and dump breakfast on the stovetop. The alert reader will notice a missing weld between the blade and the bottom wire handle:

    Spatula Search - thin spring steel
    Spatula Search – thin spring steel

    This very thin plastic blade has similar problems with poor cut-ability and excessive flexibility:

    Spatula Search - thin springy plastic
    Spatula Search – thin springy plastic

    This one looked really promising and worked almost perfectly. Regrettably, its nylon blade bears a 400 °F rating and the bottom of the omelet reaches nearly 450 °F. You can see what happens to the reasonably sharp edge as it scrapes across the pan:

    Spatula Search - heavy slotted nylon
    Spatula Search – heavy slotted nylon

    The omelet cooks at the temperature it cooks at, which part of the specifications is not subject to further discussion.

    So, we’re stumped. Having trawled the usual online and big-box stores, we’ve been unable to find a replacement. Simple steel blades aren’t available. Trendy silicone-bonded stainless steel blades combine the worst of all worlds: won’t cut and won’t flip. Pretty nearly anything you don’t see above seems obviously unsuitable for our simple needs: too big, too small, or too melty.

    We’ll consider all recommendations and suggestions! Thanks …

  • Monthly Science: CR2032 Lithium Cell Life

    One of the Hobo dataloggers asked for a new battery during its most recent data dump. The old battery dates back to January 2015:

    Maxell CR2032 lithium cell - 22 month life
    Maxell CR2032 lithium cell – 22 month life

    That was when a batch of Energizer cells failed in quick succession: it wasn’t the datalogger’s fault. I’ve been handling the cells a bit more carefully, too, although that certainly doesn’t account for the much longer life.

    With batteries, particularly from eBay, you definitely can’t tell what you’re going to get or how long it’ll last; that’s true of many things in life.

  • Inside Another 9 V Battery

    A long time ago, I discovered some quasi-AAAA cells inside 9 V batteries:

    Inside a batteries.com 9V battery
    Inside a batteries.com 9V battery

    It occurred to me that I should dismantle a defunct Rayovac Maximum 9 V alkaline battery from the most recent batch (*) to see what it looked like:

    Rayovac Maximum 9V battery - interior
    Rayovac Maximum 9V battery – interior

    Surprise!

    A closer look at those pancake cells:

    Rayovac Maximum 9V battery - detail
    Rayovac Maximum 9V battery – detail

    They look like separate cells bonded into a stack, although there’s no easy way to probe the inter-cell contacts; the leftmost cell probably died first.

    (*) Which has apparently outlived the Rayovac Maximum brand, as they don’t appear on the Rayovac site.

  • Running Lights

    New Cadillacs have thin white LED running lights along the front edges, with angular chromed trim below:

    Cadillac running lights
    Cadillac running lights

    Their SUVs have matching vertical-stripe taillight / markers; it’s obviously a stylin’ thing. If it weren’t for the power, I’d run LED strips along the edge of the fairing & seat frame on our ‘bents.

    Probably due to having read Glory Road at an impressionable age, those lights always remind me of Heidelberg dueling scars:

    Adolf Hoffmann-Heyden -- Dueling scar
    Adolf Hoffmann-Heyden — Dueling scar

    Cannot be unseen…

  • Good Signage Seems Difficult

    As expected, the mis-assembled cart corrals in the Walmart parking lot remain that way. One corral has an additional feature that’s surely been there since Day 0:

    Walmart cart corral - backwards and upside down
    Walmart cart corral – backwards and upside down

    On the upside, that’s a high-reliability, high-availability trash can.

  • Vacuum Tube LEDs: 6H6GT Dual Diode

    Having accumulated a set of octal tube base clamps, it’s now a matter of selecting the proper clamp for each tube:

    Octal tube base V-block clamps
    Octal tube base V-block clamps

    The process of shell-drilling the tube base, drilling the hard drive platter, printing a tube socket and case, wiring up the Arduino and base LED, then assembling the whole thing requires a bit of manual labor, assisted by some moderately exotic shop machinery.

    The getter flash atop this small 6H6GT dual diode tube rules out a cap and there’s not enough space for a side light:

    6H6GT - on platter
    6H6GT – on platter

    Fortunately, the base LED completely lights the internal glass:

    6H6GT - purple phase
    6H6GT – purple phase

    The slowly changing color would make a fine night light:

    6H6GT - cyan phase
    6H6GT – cyan phase

    It must be Art!

  • Cast Iron Pan Electrolysis: Anode Fragment

    Sacrificing a scrap EMI shield from a junked PC as the electrolysis anode, I grabbed a tab with the battery charger clamp:

    Cast iron pan electrolysis - bucket
    Cast iron pan electrolysis – bucket

    Turns out it didn’t survive the encounter:

    Cast iron pan electrolysis - anode front
    Cast iron pan electrolysis – anode front

    That white blob extends around to the other side:

    Cast iron pan electrolysis - anode rear
    Cast iron pan electrolysis – anode rear

    Yeah, it got hot enough to melt a blob from the 6 gallon plastic bucket before burning through.

    I tossed that into the garage so I wouldn’t forget it aaaand here we are …