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  1. Relevant to the correct comments by Stevef above,...

    Relevant to the correct comments by Stevef above, the bones of the back strongly interlock like pieces of a jigsaw puzzle. A quick look at any skeleton or skeleton casting will show this. THe facet...
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    Agree. If you must fix it rather than get a...

    Agree.

    If you must fix it rather than get a replacement, I'd use an o-ring mechanically compressed between an exterior flat, say 2" diameter, cap made of 3/16" material with a 6 or 8 hole bolt...
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    That is generally true if the bob is (plumb:))...

    That is generally true if the bob is (plumb:)) full of mercury. But if the bob is partially full as was indicated by a "take-down" of a bob on Youtube but not, evidently, as indicated by the patent....
  4. Mark, I have for a long time been curious how...

    Mark,

    I have for a long time been curious how much a granite plate moves around and for how long it moves around after an alcohol wipe down like the one you describe above. Have you made any...
  5. Awesome combination of technical expertise...

    Awesome combination of technical expertise executed well. That alone is something most of us would love to be able to do as any where near as well as you did. Beyond that, you did a major amount of...
  6. How about citing a few of the more convincing...

    How about citing a few of the more convincing ones.

    Denis
  7. Based on ??? Denis

    Based on ???

    Denis
  8. Here is the short summary: Most low back pain...

    Here is the short summary:

    Most low back pain resolves in a few days. So, even if it quite painful, give it a few days. Moving around as tolerated helps. Strict bed rest is not as good as some...
  9. I will definitely be following up on this lead. ...

    I will definitely be following up on this lead. Thank you! Over the years I have heard about Cast Iron Mike multiple times---always good reports. I have got to meet him and pick his brain if...
  10. https://www.practicalmachinist.com/vb/images/metro...

    https://www.practicalmachinist.com/vb/images/metro/blue/misc/quote_icon.png Originally Posted by dgfoster https://www.practicalmachinist.com/vb/images/metro/blue/buttons/viewpost-right.png
    Have you...
  11. Have you tried running a surface gage over a few...

    Have you tried running a surface gage over a few of squares to see if the show flattish or otherwise? I guess I’d support the gage on a stone and reach out over the lapped plates. Just putting a wet...
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    The swing time (period) of the pendulum is only...

    The swing time (period) of the pendulum is only slightly affected by its mass. In a vacuum two bobs with different densities but the same center of gravity have the same period. In air the denser of...
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    My guesses: Probably for the same reason new car...

    My guesses: Probably for the same reason new car models are not named Edsel, new planes are not named Hindenburg, and cruise ships are not named Titanic. There might be a bit of a perception issue...
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    Summary: both are bobs, but have different...

    Summary: both are bobs, but have different suspensions and needs.

    Suppose the mercury in the clock pendulum completely fills the cavity in that pendulum. As the pendulum swings there is no...
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    Ahh, the conspiracy theories (free of any actual...

    Ahh, the conspiracy theories (free of any actual supporting data—-all suppressed by “them” I’m sure) will never end. The facts are that there were widely available and widely used and reported lab...
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    Interestingly, influenza essentially “did not...

    Interestingly, influenza essentially “did not happen” this year. The number of infections as tracked by the CDC barely registered. Why? Social distancing, masking, hand washing (and influenza...
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    Agreed. Two thoughts: Heat flows...

    Agreed.

    Two thoughts:

    Heat flows downhill—-from hotter to cooler always. So the internal temp could not exceed the external temp when the heat source is external. The oven analogies are...
  18. I've silver soldered plenty of 12L14 parts and it...

    I've silver soldered plenty of 12L14 parts and it solders just fine, of course. But, for this assembly I would definitely weld it.

    Assume the balusters are to be fixed between upper and lower...
  19. I have tigged a lot of 12L14. It is easy to...

    I have tigged a lot of 12L14. It is easy to weld. The welds may not have the tensile strength of comparable “weldable” steel but they are also not going to just be crap and will look like any other...
  20. My musing above about using various media like...

    My musing above about using various media like gravel or stone chips was meant in reference to rotary tumbling not blasting. Dust could be a problem there too. But, it could probably be easily...
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    One thing is for sure: Amps X Volts = Wasps (not)...

    One thing is for sure: Amps X Volts = Wasps (not)

    Denis
  22. It is very helpful to hear a detailed description...

    It is very helpful to hear a detailed description of what it has taken to actually use equipment very similar to what I currently have at my disposal to do some shot blasting. Thank you for taking...
  23. Sometimes it is good to NOT know that you can't...

    Sometimes it is good to NOT know that you can't do something. In some ways that is true about my getting into iron casting. Had I known all the potential and real problems, I probably would not...
  24. And you are referring to flame cut pieces and not...

    And you are referring to flame cut pieces and not plasma cut—-right. Plasma nitrites the steel. Cutting that is really bad. I would only try to cut a plasma surface after grinding. Maybe someone...
  25. If I can get my hands on a sample of shot to try,...

    If I can get my hands on a sample of shot to try, I would do it in a heartbeat. I may just pony up for 50 pounds to try it. Fciron reports success with a siphon gun and not a huge setup. So, I am...
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