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Re: [multimachine] Re: New machine badly needed/an answer maybe

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  • David G. LeVine
    ... Actually, concrete is a poor choice since it has two characteristics which hurt: * Concrete shifts and shrinks as it hardens, non-shrink grout doesn t. *
    Message 1 of 49 , Aug 30 4:27 PM
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      On 08/29/2013 07:27 PM, forget_simon wrote:
      A bolt-on lathe is a great idea. However, for people like myself that considers it might be too light at the end, why not add concrete in hollow spaces? This would stiffen the structure while adding weight.

      Actually, concrete is a poor choice since it has two characteristics which hurt:
      • Concrete shifts and shrinks as it hardens, non-shrink grout doesn't.
      • The water in concrete can cause corrosion in steel.

      Solutions exist, rubber (or polymer) bladders both limit the corrosion and allow the concrete to move while curing.  They are pretty easy to use and not all that expensive.

      Other fills (bird shot in oil, for example), may be better and/or easier to use.

      Dave  8{)

      --

      "A word to the wise ain't necessary - it's the stupid ones that need the advice."

      Bill Cosby
    • David G. LeVine
      ... Just to note, non-straight pipe, 2 lally columns and a rope loop with a stick can apply enough force to bend the pipe straight, a hydraulic jack and a U
      Message 49 of 49 , Sep 1, 2013
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        On 08/31/2013 11:08 PM, louis richardson wrote:
        i am sure any oil field pipe that is bent wll not be sent back over seas from where it came. 

        Just to note, non-straight pipe, 2 lally columns and a rope loop with a stick can apply enough force to bend the pipe straight, a hydraulic jack and a "U" frame  will work better.

        Start with a pipe and use a surface plate (monument stones work well), to find a high spot.  Apply pressure to the high spot to move it slightly beyond the final target position.  This is one of those "feel" things, after a while you will know just how much beyond the target you need to go.  It will vary depending on the pipe and phase of the moon, but you should be able to get below 0.001" run out pretty quickly.

        If you don't believe me, try it with some scrap, it works surprisingly well.

        Now, on monument stones, when granite is blanked for gravestones and government buildings, even a small flaw can make it unsaleable.  The remaining options are: *Total loss, *use it as raw scrap, *find a buyer.  If after significant work to the monument stone (gravestone, for example), the stone is to be discarded, someone who covers the cost of raw materials and labor may be very welcome.  Sometimes, a six-pack of beer on a hot day will get you a broken headstone missing a corner.

        Dave  8{)
        --

        "A word to the wise ain't necessary - it's the stupid ones that need the advice."

        Bill Cosby
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