jrmichler's latest activity
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Jjrmichler replied to the thread I need a concave mirror with a focal length of 150 feet.I calculated the sun image diameter assuming: Sun 865,000 miles diameter Sun 93,000,000 miles distant Focal length 150 feet Perfect...
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Jjrmichler replied to the thread In the early days of electricity, they didn't have wall plugs.About 1980, my grandmother had her wash machine plugged into one of these adaptors. I asked her if that really worked, and she said...
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Jjrmichler replied to the thread HP Required to move a robot 10meters at 1.5m/sec.You are correct. For moving 4000 lbs, you need some math. Here is how I solve this type of problem. Step 1: Sketch an acceleration -...
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Jjrmichler replied to the thread Random Photos.This video of two hungry fawns feeding from their mother was taken looking out my living room window using a cell phone camera. We only...
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Jjrmichler replied to the thread Status Update by JRMichler.These spam posts get moderated so fast that most people never see them. The moderators have a special button that deletes the post and...
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JJust ONCE, I wanted to see a post titled Status Update that was not a blatant, annoying spam post by a new member. So here it is...
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Jjrmichler replied to the thread Random Photos.Fall colors on the ATV trail less than 5 minute walk from my house. The colors are not quite at their peak. This is Northern...
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Jjrmichler replied to the thread Looking for free Word Processor with at least some formatting features.I have been using LibreOffice for 10(?) years now. No problems with losing / exploding / crashing / failing documents. I only use...
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Jjrmichler replied to the thread Soft/Stable Movement for Parallelogram Mount with Wheel + Printhead.Search dashpots in McMaster-Carr. Dashpots are designed to slow something down for a soft landing. You will need some sort of bracket...
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JJust remove the question from "defense contractors" and think about it for any job in engineering. The engineering challenges at, say...
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Jjrmichler replied to the thread Site Usability nitpick -- Hyperlinks should be underlined.I am slightly color blind, to the point where I can just barely pass an FAA 2nd class flight physical. That vision deficiency has been...
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Jjrmichler replied to the thread Making a compressor from a steam engine or Tesla Turbine.Yes. A reciprocating air compressor, like a steam engine, has a piston moving up and down in a cylinder. Air compressors need an air...
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Jjrmichler replied to the thread Testing How to not get stressed on the actual exam?.Some thoughts: When working on a difficult problem, I try for a mental state of relaxed alertness. When I start slipping away from...
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JThis isn't bad; this is danged clever.
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Jjrmichler replied to the thread Random Photos.Three consecutive photos of the neighbor's house. The first photo is from 2003. That house was originally built some time before...
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