jrmichler's latest activity
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Jjrmichler replied to the thread How is bacteria added to a septic tank?.This is the secret to proper operation of a septic system. Feed it human waste, pump it every three years or so, and keep out anything...
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Jjrmichler replied to the thread What are career paths that combine physics and education?.Attitude. A positive attitude. Something like: "That was good experience, but now it's time to do something different." And always...
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Jjrmichler replied to the thread What are career paths that combine physics and education?.Sometimes, you just need to try something to find if you really like it. And be willing to change if you don't like it. My first...
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Jjrmichler replied to the thread Random Photos.Just came back from the hardware store, getting ready to turn down my driveway, and look what's in the way. I need a dash cam with a...
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Jjrmichler replied to the thread Roll forming question.Everything I know about roll forming is in the following quote from Manufacturing Processes for Engineering Materials, by Kalpakjian...
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Jjrmichler replied to the thread Wood/Glass/Metal Stop these carriage bolts from spinning when I tighten nuts.The local hardware store only has 1/4" stainless carriage bolts up to 4" long, and I needed some 4.5" long. I ordered them from...
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Jjrmichler replied to the thread Transmission problem involving oscillating arm.Here is a practical application of a similar linkage and gear train. It's from US Patent 9,604,381. Rotating bar 172 is mounted on a...
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Jjrmichler replied to the thread "Sane" error margins for emotor torque measurement.Some general rules: 1) All prototypes differ from what was designed due to some combination of manufacturing tolerances, differing...
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Jjrmichler replied to the thread Wood/Glass/Metal Stop these carriage bolts from spinning when I tighten nuts.McMaster-Carr has everything, including 316SS carriage bolts...
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Jjrmichler replied to the thread Can you get pulled under a train?.The magnitude of the aerodynamic effects of a vehicle are mostly due to the frontal area. The frontal area of a Class 8 truck...
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Jjrmichler replied to the thread Pneumatic Air Tools - Hose / Compressor Friction Loss?.In order to answer, we need to know how much air each breaker uses. It should be in the owner's manual. If that's not available, do...
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Jjrmichler reacted to Baluncore's post in the thread 3"x3" steel tube, Structural engineering question with
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An engineer would not build a simple cantilever, because it would be heavier and more expensive than the many alternative design... -
Jjrmichler replied to the thread 3"x3" steel tube, Structural engineering question.None of which tells us that the overall design is safe. We also have to consider that other people read these threads to learn how to...
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Jjrmichler replied to the thread Rate of room temperature change related to U values of composites.When the outside air is better than the inside air, you need to add ventilation. A leaky house gets the ventilation from holes and...
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Jjrmichler replied to the thread Rate of room temperature change related to U values of composites.Well insulated homes have humidity problems in warm humid weather. The AC cannot run long enough to get the indoor humidity down. Some...
