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  • ed_h's Avatar
    Yesterday, 11:34 PM
    ed_h replied to a thread OT: Wood board load limit in General
    Yup, overbuilding a little is a good idea if you can. I built the house I live in, and some other assorted smaller structures on the property. ...
    9 replies | 350 view(s)
  • ed_h's Avatar
    Yesterday, 09:04 PM
    ed_h replied to a thread OT: Wood board load limit in General
    The 1/3 rule works well for 2 x 4, marginally for 2 x 6, and not very well for larger sizes. The strength of a beam is proportional to the width...
    9 replies | 350 view(s)
  • ed_h's Avatar
    Yesterday, 07:03 PM
    Mill scale is a complex of iron oxides not so different from rust. I find that rust removers work similarly for scale. Ed
    30 replies | 1322 view(s)
  • ed_h's Avatar
    Yesterday, 04:26 PM
    ed_h replied to a thread OT: Wood board load limit in General
    I use this formula for thumbnail calculations: Max Load = (fiber stress x width x depth^2)/(9 x length) width & depth in inches, length in feet...
    9 replies | 350 view(s)
  • ed_h's Avatar
    Yesterday, 04:19 PM
    HCl is a gas and hydrochloric or muriatic acids are just HCl dissolved in water. This is what's behind muriatic acid's reputation for being able to...
    30 replies | 1322 view(s)
  • ed_h's Avatar
    04-02-2017, 11:43 AM
    ed_h replied to a thread The only way is up in General
    Good catch, Bob. I should have worded that a little better. Glad she doesn't follow this board. Ed
    21 replies | 1896 view(s)
  • ed_h's Avatar
    04-01-2017, 08:40 PM
    ed_h replied to a thread The only way is up in General
    Ha! Tell me about it! http://bullfire.net/Mill/Milling%20Machine.html I consider a basement shop ideal in many ways. My wife, not so much. ...
    21 replies | 1896 view(s)
  • ed_h's Avatar
    04-01-2017, 11:42 AM
    ed_h replied to a thread OT: Cool Mind Bender Video in General
    I believe thats a 2-D Hilbert curve. It's a 1-D curve that can fill a 2-D plane. I've not seen it generated that way. Thanks. Ed
    2 replies | 281 view(s)
  • ed_h's Avatar
    03-30-2017, 08:52 PM
    ed_h replied to a thread Electrolysis, and cast iron. in General
    My experience with ER would not support the claim of 1/2 pound of rust. It works and works well, but for me it seems to wear out fairly quickly. ...
    71 replies | 4412 view(s)
  • ed_h's Avatar
    03-30-2017, 06:45 PM
    ed_h replied to a thread Electrolysis, and cast iron. in General
    4) ER is also a good approach if you need to preserve zinc or other plating on a part. Most other methods will attack it. 8) I think Molasses may...
    71 replies | 4412 view(s)
  • ed_h's Avatar
    03-30-2017, 04:16 PM
    ed_h replied to a thread Electrolysis, and cast iron. in General
    I wonder if what some think is flash rust after a phosphoric acid treatment is really just some iron phosphate left after drying, which can present...
    71 replies | 4412 view(s)
  • ed_h's Avatar
    03-30-2017, 03:50 PM
    ed_h replied to a thread Lithium battery question in General
    You certainly could be right about what's used in power tools--I haven't taken any apart. I was just pointing out that the general heading "lithium...
    19 replies | 1025 view(s)
  • ed_h's Avatar
    03-30-2017, 12:42 PM
    ed_h replied to a thread Lithium battery question in General
    All lithium cell technologies I'm aware of require charge (and, ideally, discharge) monitoring at the cell level. Given that, lithium iron phosphate...
    19 replies | 1025 view(s)
  • ed_h's Avatar
    03-30-2017, 11:21 AM
    ed_h replied to a thread Electrolysis, and cast iron. in General
    I think this may have been mentioned before, but the black smut is probably one or more of the following: magnetite, a reduced form of iron oxide,...
    71 replies | 4412 view(s)
  • ed_h's Avatar
    03-30-2017, 11:05 AM
    ed_h replied to a thread Lithium battery question in General
    Some variants of lithium cell chemistry are much safer. E.g. lithium iron. A little less energy density, though. Ed
    19 replies | 1025 view(s)
  • ed_h's Avatar
    03-20-2017, 05:59 PM
    Apparently sodium power cables are (or were, at least) a real thing: http://dx.doi.org/10.2172/5949513 Ed
    22 replies | 1484 view(s)
  • ed_h's Avatar
    03-19-2017, 08:35 PM
    ed_h replied to a thread OT CPU at 100%? in General
    Many moons ago when I was an undergraduate EE, we typically had a choice of microprocessors to use for labs and projects. We could buy a Motorola 68...
    44 replies | 2158 view(s)
  • ed_h's Avatar
    03-19-2017, 04:42 PM
    ed_h replied to a thread OT CPU at 100%? in General
    Me three. Had nothing but heartache with Windows update--both the process itself and some of the "updates". Anyone else had trouble with their...
    44 replies | 2158 view(s)
  • ed_h's Avatar
    03-18-2017, 03:37 PM
    ed_h replied to a thread OT CPU at 100%? in General
    I also had the plugin container.exe issue with firefox. This is on Ubuntu. Ed
    44 replies | 2158 view(s)
  • ed_h's Avatar
    03-14-2017, 12:20 AM
    I believe re-seating is the most effective way to fix a contact problem like that. Contact cleaner is more for contacts that open and close, so...
    24 replies | 1280 view(s)
  • ed_h's Avatar
    03-09-2017, 03:02 PM
    ed_h replied to a thread method for making a dome in General
    Bucky was a bit of an odd duck, but he was a media darling, so he got a lot of exposure. I'm not sure if his tensegrity structures would have caught...
    30 replies | 2395 view(s)
  • ed_h's Avatar
    03-09-2017, 12:19 PM
    ed_h replied to a thread method for making a dome in General
    Regular hexagon tiles will only produce a flat surface. Including regular pentagons at specific locations will pucker the surface into a closed...
    30 replies | 2395 view(s)
  • ed_h's Avatar
    03-06-2017, 03:40 PM
    ed_h replied to a thread Rocker Arm Attachment in General
    Yes, I see what you mean. I guess if you were going to sleeve the rocker bores and did that first, at least you'd have consistent bores to work...
    22 replies | 6174 view(s)
  • ed_h's Avatar
    03-05-2017, 12:09 PM
    ed_h replied to a thread Rocker Arm Attachment in General
    Dave-- Could you machine a cylindrical sleeve to locate the rocker instead of the cones? That should reference the ground surface to the bore...
    22 replies | 6174 view(s)
  • ed_h's Avatar
    03-03-2017, 06:08 PM
    ed_h replied to a thread OT understanding colors ... in General
    Yes, I'm not sure how the particle nature could be demonstrated at such low frequencies. I calculated that at a 1 km wavelength (about 300 KHz),...
    75 replies | 4089 view(s)
  • ed_h's Avatar
    03-03-2017, 04:21 PM
    ed_h replied to a thread OT understanding colors ... in General
    I don't think there is anything fundamentally different at longer wavelengths. The same duality should still apply. Ed
    75 replies | 4089 view(s)
  • ed_h's Avatar
    03-03-2017, 03:55 PM
    ed_h replied to a thread Electrolysis, and cast iron. in General
    It's easy to find a few references to it from the early 50s, but not many. OTOH, Youtube search yields a couple of thousand hits on the subject...
    71 replies | 4412 view(s)
  • ed_h's Avatar
    03-03-2017, 03:26 PM
    ed_h replied to a thread OT understanding colors ... in General
    You're right, of course. I was inappropriately limiting my thinking to RF communications. Thanks. Ed
    75 replies | 4089 view(s)
  • ed_h's Avatar
    03-03-2017, 02:31 PM
    ed_h replied to a thread OT understanding colors ... in General
    Absolutely true, but at RF frequencies, with which I have some experience, I can't think of any practical situations where it exhibits it's particle...
    75 replies | 4089 view(s)
  • ed_h's Avatar
    03-03-2017, 12:52 PM
    ed_h replied to a thread OT understanding colors ... in General
    AK, I know a lot of really good people who are not Objective Realists. With some effort, they can lead pretty normal lives. Ed
    75 replies | 4089 view(s)
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