concrete lathe, concrete milling machine and others

  1. gaz1

    gaz1 Member

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  2. Rig Pig

    Rig Pig Member

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    No substitute for good old cast iron, I wonder how long it would last on a lumpy interrupted cut.
     
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  3. 8ob

    8ob Forum Supporter

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    You have to admit its an interesting concept though Mr Pig :laughing:, never heard of epoxy concrete before :dontknow: Thanks for posting @gaz1 :thumbup:

    Bob
     
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  4. Kram

    Kram Member

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    Epoxy granite is supposed to be the best, many of the big machines use it, but getting the right mix, without bubbles or the mix settling out, is quite difficult. It is used with steel plates/ rails for mounting everything.
    I have 5 concrete fence posts in the garden Im very tempted to use one for a drill press
     
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  5. Pete.

    Pete. Member

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    That first one is a full-on abortion :D
     
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  6. gaz1

    gaz1 Member

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    the problem with cast iron its expensive to have something cast using its method

    i had taken note of @pressbrake1 post casting of the camel back / fish back straight edge

    and to have something cast would truly be expensive

    https://www.mig-welding.co.uk/forum/threads/camel-fish-back-straight-edge.97254/page-9

    not everyone can afford one depending on where you live
     
  7. bricol Member

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    18 years ago I was working on a project that involved a well known German manufacturer of rather large machine tools and several well known military aircraft manufacturers in various places in the world (that only recently finally delivered some flying machines to the UK) that was using high strength concrete as part of the machine structure.

    Funnest bit for me was seeing a guy in typical German bib and brace soveralls, using a fold out wooden carpenters rule and a laser to position things :)
     
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  8. gaz1

    gaz1 Member

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    @8ob

    watch this video its interesting

     
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  9. gaz1

    gaz1 Member

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  10. Rig Pig

    Rig Pig Member

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    It's only expensive because we have closed down most of the iron foundrys, it's still cheap in other countries where they actually make things, epoxy granite isn't cheap really and I doubt it compares strength wise with iron, I believe it's used as a damping filler in high end machines. Its interesting to see what people are making but i wonder how well these machines actually perform.
     
  11. gaz1

    gaz1 Member

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    I was looking down concrete to build a metal planing machine as its the closest i can get to cast iron build

    i could use an old cast iron radiator for the runs but it would be ackward to replace over the years

    however the build would still need a homemade shaper or grinder to flatten the material off

    epoxy granite planning machine is viable but way too expensive for that sort of a build so its back down to concrete again

    either use soft steel hardened and replaced when needed
     
  12. Rig Pig

    Rig Pig Member

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    It would be an interesting build but getting everything square and true enough to operate as sideways would be a nightmare, I spent a while planning a bedway grinder for an old lathe I had, I was thinking of using old hydraulic rams as the ways because they were the only thing I could think of that would be accurate enough, the problem is the effort and cost involved didn't justify it, a better lathe was cheaper! There are some horrible botch jobs on YouTube using angle grinders to try and dress bedways, sadly the end result is probably worse than the worn bed was to start with!
     
  13. grim_d

    grim_d Unlikeable idiot.

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    I wouldn't, they tend to be rubbish concrete and are super fragile. The strength is all in the 6mm "rebar"
     
  14. pressbrake1

    pressbrake1 Forum Supporter

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    essex england
    To get a full size wheeling machine (English wheel) cast in England is £3000+ and there’s no cores single piece casting out of grey cast iron.
    I reckon to make say my dsg in the correct dsg spec semi steel would cost £5000 a ton so £25000 before we even start
     
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  15. pedrobedro

    pedrobedro Man at Matalan

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    A concrete aeroplane sounds like it would go down like a lead balloon :D Ordinary concrete was used to make boats and barges, wreckage of one appears at low tide near Whitby Scar.
     
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  16. gaz1

    gaz1 Member

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    my thoughts on the concrete planing machine

    with bolts coming through the base of the planning machine then goes through a u channel bolted down to it

    leveling off can be done with planed spacers and a long steel bar to fit into the channel which is then bolted to the u channel

    this is then fastened to another bar either use a hardened steel bar or use a cast iron bar

    the uprights can be done the same way but by using longer bars it would create something to fasten too and able to slide the mechanism up and down
     
    Last edited: Apr 14, 2020
  17. Seadog

    Seadog Forum Supporter

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    What about a ship made of ice, then?
     
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  18. gaz1

    gaz1 Member

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    ive made this out of perlight and fire cement

    slight tapping on the forms to settle them but not too much as heavy material drops to the bottom of the mix

    perlight and cement mix was heavy in that context however was powdery and also wears away too easily as had to be careful with the forms

    small one

    20160221_120429.jpg 20160221_120532.jpg

    large one

    20160221_130042.jpg 20160221_130055.jpg
     
  19. chrisg3103

    chrisg3103 Forum Supporter

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  20. gaz1

    gaz1 Member

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    things have changed enough other items can be made nowadays with different technology

    so concrete lathes

    concrete planing machine

    concrete milling machines

    all can be made even very smooth



     
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