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  • How to Make Large Blocks of Clear Ice for Sculpting and Drink Making

    I am much more interested in why normal ice is not clear than in using clear ice for any particular purpose. I had always assumed it was due to dissolved gases. Your project, involving keeping the water in motion, suggests it may be more due to nucleation--forming of crystals around centers of impurities.I have made degassed water for the purpose of experiments in sonoluminescence, where tiny bubbles excited by an ultrasound field emit a glow of light (a phenomenon still not well understood). It is done by bring distilled water to a boil, putting a stopper in it and rapidly cooling it. I may try freezing degassed water without any agitation. If I do, I'll report here.Your experiment doesn't seem to rely on the purity of the water, other than to note that the residue that settles out …

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    I am much more interested in why normal ice is not clear than in using clear ice for any particular purpose. I had always assumed it was due to dissolved gases. Your project, involving keeping the water in motion, suggests it may be more due to nucleation--forming of crystals around centers of impurities.I have made degassed water for the purpose of experiments in sonoluminescence, where tiny bubbles excited by an ultrasound field emit a glow of light (a phenomenon still not well understood). It is done by bring distilled water to a boil, putting a stopper in it and rapidly cooling it. I may try freezing degassed water without any agitation. If I do, I'll report here.Your experiment doesn't seem to rely on the purity of the water, other than to note that the residue that settles out is gross. Have you tried magnetic stirring wands instead of pumps?

    Thanks, that article explains a lot. So, in theory, absolutely pure water should freeze clear, but that level of purity may be unattainable in practice. Whereas if the water is frozen "directionally", all the impurities get displaced to one end.

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  • DIY Wind Turbine Using Car Alternator

    The weak link seems to be your turbine. It's great you were able to construct one out of cheap and widely available PVC pipe, but more time spent on the design of the blades and perhaps having them fabricated or buying some off the shelf blades might really pay off. I know the idea was to use cheap or scrap parts, but 14KW of free energy might pay for itself soon!

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  • A Car Key Made From a Ratcheting Wrench

    Yes, but then you'd lose your key.

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  • Vintage Camera Lamp With DIY 35mm Slide Shade

    If you wanted to do the slides from scratch without sending them out, you can still get E6 kits from B&H Photo (I just checked). You probably wouldn't have to be super critical about time and temperature control, for the application.I do miss film, especially seeing a B&W image magically appear in a tray.

    If you're not going to use the camera, that looks like a fun, creative, non-destructive use for it. I almost bought one of those in the day, but settled on the Nikon FM instead (which I still have, and works fine). I'm a little more interested in shooting film than you are, but admit I haven't in a long time. I have enough vintage cameras for a lamp in every room with many to spare.

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  • The Easiest Thin Strip Jig for the Table Saw

    Nice idea for a quick and dirty zero clearance plate. That alone made the entire video worth watching. You really should be using a push stick! Better still the blade guard--those thin strips could go flying--but probably not practical here.

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  • Building an Arduino Water Level Detection Sensor

    Another solution might be to make the fixed resistor a similar grid, but always immersed in the water. If this isn't practical--for instance, if the container is ever expected to be completely empty-- just use another container filled with a sample of the same water.

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  • ziqfriq. commented on Josehf Murchison's instructable Tube Converter
    Tube Converter

    It could also have found use in push-pull stages, though not many table radios used P-P. Clearly, putting that much plate dissipation in a single envelope was a mistake they thought better of.

    Interesting article. I think it is a little short on detail as to how you made the male part. Concentration was on the nontrivial task of finding a suitable replacement.You say you "simply" soldered steel pins, without any suggestion for a source. Also, you presumably used ceramic sockets since soldering inside a Bakelite one without melting it and putting the pins out of alignment would be challenging. Finally, since you are plugging the top of one socket (with added pins) to the top of another, the pin numbers (that usually are engraved on the socket) would be wrong, since it is flipped. I think that is an important point and worth mentioning.Out of curiosity I went on eBay, and found boatloads of NOS 6AN8's in the 8 dollar range. If you were intent on only using tubes i…

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    Interesting article. I think it is a little short on detail as to how you made the male part. Concentration was on the nontrivial task of finding a suitable replacement.You say you "simply" soldered steel pins, without any suggestion for a source. Also, you presumably used ceramic sockets since soldering inside a Bakelite one without melting it and putting the pins out of alignment would be challenging. Finally, since you are plugging the top of one socket (with added pins) to the top of another, the pin numbers (that usually are engraved on the socket) would be wrong, since it is flipped. I think that is an important point and worth mentioning.Out of curiosity I went on eBay, and found boatloads of NOS 6AN8's in the 8 dollar range. If you were intent on only using tubes in your collection, or into the technical challenge of creating this adapter and sharing it with others, that's fine. But the amount of skilled labor you put into it greatly exceeded 8 bucks worth. Also, someone interested in doing an "authentic" restoration of the 'scope would prefer that option, I would think.

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  • ziqfriq. commented on Josehf Murchison's instructable Tube Converter
    Tube Converter

    I can see where a double beam power pentode tube would have been a good idea in theory, but not in practice.

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  • Calculate Pi by Throwing Sausages

    You don't say anything about throwing (dropping?) the sausage (maybe the video does, but it won't play here), but you have to be really careful about systematic bias: somehow favoring one way of landing over another. You obviously were, judging from the result you got. You need to avoid having good aim!I first encountered a Monte Carlo method for estimating pi in an instruction book that came with a scientific calculator. The calculator had a function that generated a random number between 0 and 1, with which one could simulate projectiles landing within a circle versus outside the circle but within the circumscribed square. The accuracy of the result was mind blowing (again, you have to have a good random number generator free of systematic bias, but most of them are). It's also eas…

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    You don't say anything about throwing (dropping?) the sausage (maybe the video does, but it won't play here), but you have to be really careful about systematic bias: somehow favoring one way of landing over another. You obviously were, judging from the result you got. You need to avoid having good aim!I first encountered a Monte Carlo method for estimating pi in an instruction book that came with a scientific calculator. The calculator had a function that generated a random number between 0 and 1, with which one could simulate projectiles landing within a circle versus outside the circle but within the circumscribed square. The accuracy of the result was mind blowing (again, you have to have a good random number generator free of systematic bias, but most of them are). It's also easy to program such a simulation, in almost any language. But I guess using real projectiles is more fun. The accuracy of your result is a testament to how truly randomly you were able to throw the projectiles.

    In fact, you could do it throwing sausages onto a pizza pi, using a slightly different Monte Carlo algorithm.

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  • ziqfriq. commented on Jonny Builds's instructable One Hour Workbench
    One Hour Workbench

    I need a workbench, and this looks like it will fit the bill. I think it's going to take me longer than an hour, though. Also, I'd like it to be the right height to use as an outfeed table for my table saw, making the height calculations a little more complicated. Ideally, with some height adjustment, since my attic floor isn't perfectly level. Maybe leveling feet to lift it off the castors? That may be a good idea for general use, though castor brakes should work fine too.

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  • Hands-Free Wall-Mounted Hand Sanitizer Dispenser

    Very clever KISS solution. No electronics needed!

    Relevant only if you compared counts at hands-free hand dryers with non hands-free. Probably explained by poor or careless washing techniques prior to drying.

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  • Wooden Keep Sake Box With 4 Digit Magnetic Combination

    About time the great and powerful US got on board with the simple, convenient and practical system of measurements the whole rest of the world uses, eh?

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  • Slide Out Refrigerator Cabinet

    This is exactly what I need for the large pantry where my fridge is located. I've been mulling over possible designs for a long time. I will definitely give yours due consideration.I've been contemplating different sliding mechanisms, including barn door tracks email spammers seem intent on selling me lately. Your combination of castors and drawer slides looks like a winner, if I can find some long eneough.

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  • These are elegantly simple pieces to take the place of a few hundred dollar or more instrument. All the more impressive being built from scraps. I'm all for doing the math myself and saving the money.Your math is correct, but way too complicated! Using analytic geometry to find the slope of a line is way overkill, let alone solving 3 simultaneous equations.In the spirit of KISS, referring to your second diagram (no need to solve the more general problem): I call your length of AC--the probe length--d, your BX--the measured depth-h, to save tedium in algebraic manipulations. As noted, OB is a perpendicular bisector of AC so AX=Cx=d/2. Applying the Pythagorean theorem givesR^2 = (R-h)^2 + (d/2)^2.which we may easily solve for the unknown R:R=[h^2 + (d/2)^2]/2*hBy taking the sine of the…

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    These are elegantly simple pieces to take the place of a few hundred dollar or more instrument. All the more impressive being built from scraps. I'm all for doing the math myself and saving the money.Your math is correct, but way too complicated! Using analytic geometry to find the slope of a line is way overkill, let alone solving 3 simultaneous equations.In the spirit of KISS, referring to your second diagram (no need to solve the more general problem): I call your length of AC--the probe length--d, your BX--the measured depth-h, to save tedium in algebraic manipulations. As noted, OB is a perpendicular bisector of AC so AX=Cx=d/2. Applying the Pythagorean theorem givesR^2 = (R-h)^2 + (d/2)^2.which we may easily solve for the unknown R:R=[h^2 + (d/2)^2]/2*hBy taking the sine of the arctan of Ax/XB you are in effect using the Pythagorean theorem anyway. Are you actually doing that, numerically, in your software? If so you may be losing some accuracy compared to a more direct method. Angle ABX is not something you measure directly, or need, so calculating it is superfluous.An even simpler way to get this formula is to use a nifty theorem from geometry that says when two chords intersect inside a circle the products of the segments are equal. To use this we have to extend BO so that it becomes a full diameter. Then the two products that must be equal are (2R-h)*h and (d/2)^2. I believe that theorem comes from, if not Pythagorean itself, the same similar triangle magic that gives us Pythagorean.I admit to having overthought the ball tip case for a while. You're absolutely correct, all one need do is add or subtract the ball radius depending on which side of the surface you're measuring from.I'm sure you enjoyed writing your software but wouldn't it be almost as easy to put the formula in a spreadsheet? Almost everyone has access to either Microsoft Excel or Libre Office Calc (which is free). You're going to have a PC in your shop anyway, apparently.Nitpicks aside, this is an interesting project that I'm sure will find many uses besides reverse engineering for writing G code.

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  • Sounds like in this instance you got lucky on several counts. However, if something is destined for the landfill you have nothing to lose. Even if you break something beyond repair in the process, you're no worse off. The only thing you have to decide is how much of your time it's worth for the possibility of having something working again for free. I've been there many times, with some successes. Yes, the hidden screws can be nasty. Sometimes you have to peel off labels, I don't think you mentioned that, otherwise very thorough.

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  • Probably one of the most useful to me personally Instructables. Definitely one of my top dozen or so to do projects. In other words, it's probably not going to get built tomorrow, otherwise I'd wait until then before making any suggestions.I think the most useful sort of feedback would be audible. That way, you could concentrate your vision on proper contact between the knife blade and stone. Maybe a pitch you could "zero beat" at the target angle. Or you could set it to one side of the target for instantaneous correction without having to guess which way to correct.If you go too shallow to the stone you're simply doing nothing to improve the edge, whereas if you go too deep you're potentially destroying what edge you've achieved. Therefore it might be appropriate to make …

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    Probably one of the most useful to me personally Instructables. Definitely one of my top dozen or so to do projects. In other words, it's probably not going to get built tomorrow, otherwise I'd wait until then before making any suggestions.I think the most useful sort of feedback would be audible. That way, you could concentrate your vision on proper contact between the knife blade and stone. Maybe a pitch you could "zero beat" at the target angle. Or you could set it to one side of the target for instantaneous correction without having to guess which way to correct.If you go too shallow to the stone you're simply doing nothing to improve the edge, whereas if you go too deep you're potentially destroying what edge you've achieved. Therefore it might be appropriate to make a more annoying sound when too deep. Maybe a sine one way and a sawtooth the other. In that case you would definitely set your target angle at dead center.I can see the point about engineering overkill (in fact that was my first reaction) but it looks like useful overkill. Even if I get really good at maintaining a consistent angle I can see having this appliance around at all times as a reference. Like any skill, such as tuning a piano by ear, you get rusty if you haven't done it in a while and having the electronic aids around is helpful to re-learn. It doesn't look like it would work very well on my once awesomely sharp Wusthof pairing knife, though. In fact, as much as I practice with the stones I have never quite been able to reach the degree of sharpness my better knives came with. Maybe this will help.

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  • I think for this application pi ~=3 will work just fine :-)

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