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Dennis R Levesque

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  • How to Make a Knife

    I can use this, especially for custom knives not sold in stores. For hardening the blade, i'd like to find a mini-kiln, like what's used for ceramics. But, I still need to find a good hardening "recipe". Maybe for the blade-metal, I might try cutting a section from an old lawn mower deck. They're usually stronger than most carbon steels(?). I already have a project in mind. Thanks for the post.

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  • DEC H-500 Computer Lab Reproduction

    This looks like a really cool project. Right up my alley. I like you're description(s); It's so all-inclusive. Not only is it good for practicing 3D printing and making a DIY project, and getting into Arduino, but you also get a very useful product of it. I would really like to try this (someday). I hope I can find the time to do it. You put a lot of thought/time/effort into this. Thanks.

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  • Musical Hard Drives

    That was interesting. Had a lot of good info. I've tinkered with audio and computers, but not like that. Who knows what it can lead to.

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  • Lead From Lead Acid Batteries

    You sure don't explain much. What the heck is that contraption? Is that a thermometer or pressure gauge? What number are you aiming for? What's the tubing for, propane, oxygen, smoking weed? Why can't you just melt it with a propane torch? What kind of things can you use for the crucible? Won't a tin-can develop a hole? What is the fire-to-crucible size ratio? How long does it take? Can you heat it fast, or slowly? This is certainly no recipe.

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  • In the last photo, you showed a carriage bolt. They're mainly used for wood. One thing I never understood, is why I can't find a metal washer with a square hole and gripping teeth to keep the bolt from spinning in the wood. They could be stamped out by the millions cheaply. Why does nobody do it? It can't be that hard.

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  • It seems to me the best way to ensure it's really empty is to attach an appliance (torch head, cook burner, heater, etc.) to the tank and open it up to expel the fuel.If you wait until the heat-of-the-day to close it, then cut the tank at night, there will actually be a vacuum in it. A hack-saw will not produce sparks, (just don't use a grinder on it), and cut it slowly. I've never had a problem.

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  • I hope you don't mind if I try to interpret the two different arguments about heat/light efficiency of LEDs.I have no idea what the actual specs are, but just for the sake of argument, let me use principles instead of hard facts.One person says that IF LEDs/Incandescent/Fluorescent lights have the same/nearly-the-same efficiency (10/90 of light/heat), Then LEDs use that 10% to produce much more lumens than the other sources.The other person says that those more lumens are coming from a better ratio such as 25/75 light/heat.Altho the numbers are not accurate, the principle is.Which one is true, I do not know. But, the difference is only relevant to a scientific point of view. The end result is less amps/watts for more light.As far heat itself, you can get a hand-held Infrared Thermometer‚Ķ

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    I hope you don't mind if I try to interpret the two different arguments about heat/light efficiency of LEDs.I have no idea what the actual specs are, but just for the sake of argument, let me use principles instead of hard facts.One person says that IF LEDs/Incandescent/Fluorescent lights have the same/nearly-the-same efficiency (10/90 of light/heat), Then LEDs use that 10% to produce much more lumens than the other sources.The other person says that those more lumens are coming from a better ratio such as 25/75 light/heat.Altho the numbers are not accurate, the principle is.Which one is true, I do not know. But, the difference is only relevant to a scientific point of view. The end result is less amps/watts for more light.As far heat itself, you can get a hand-held Infrared Thermometer to measure it with so there's no guess-work. If there's any doubt, just get one to test. If it passes the test, then you can get more. Problem solved. However, I know that in the summertime you could build up a high temperature without even running the lights just because of the ambient temp. You might want to measure the ambient temp, then turn on the lights and measure the temp rise. If temp is a problem, I know that somebody used to sell a thermal epoxy for heatsinks. I don't know how hard it is to find. I still have some left, but it's not for sale.As far as power supplies, I'd prefer a 12v battery/lamp system so you could use a solar panel. Other than that, I'd use whatever I had on-hand. The failed computer power-supplies I had were mostly because of dirt build-up. You could use a cloth mesh Curtain-lining as a screen filter without loss of air flow. Just check it once in a while for clogging. It's easier to clean the outside than the inside. I've even dust-proofed some of my computers that way.

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