English wheel/ wheeling raising machine

  1. gaz1

    gaz1 Member

    Messages:
    11,341
    Location:
    westyorkshire
    too me the top is the weak point if the base dosnt move hence the reason why its small then widens then comes down the column

    if the top is too stronger and the base weaker then it will give more at the base

    pressure between them both im not so sure once you feed metal inbetween them
     
  2. mtt.tr

    mtt.tr Member

    Messages:
    4,052
    Essex England
    This ofcourse is not a perfect representation no prizes for guessing that.

    Gaz you will see higher forces at the spine.

    I personally think torsion on the spine shown in the lower picture is a bigger challenge.

    IMG_20201018_205051_6.jpg


    But wheels have existed in this form forever so we know it works.
     
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  3. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,884
    essex england
    Correct, torsional failure is what kills structures
     
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  4. mtt.tr

    mtt.tr Member

    Messages:
    4,052
    Essex England
    Not trying to sound like an **** but look into second moment of inertia and free body diagrams @gaz1
     
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  5. Tom O Member

    Messages:
    327
    Location:
    Canada
    To raise the lower anvil we used 4tpi acme which was quite aggressive 8tpi would be better. And to raise remove the work a round piece with a flat machined for lifting the anvil.
     
  6. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,884
    essex england
    Yes , moving 1/4 per turn is too much
     
  7. Maker

    Maker nEw mEmBeR

    Messages:
    7,882
    Location:
    Don't ask questions
    Going off PB's original drawing, there's a sharp transition from the curve at the top to the spine, I'm sure when it's cast there'll be a small fillet there but as it is in the drawing, I'd bet that's where it breaks, if it breaks, which I don't think it will. :D
     
  8. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,884
    essex england
    And remember that’s just a template to cut out the birch ply backing that the pattern will be built up upon.
    There will be blending and shaping and no stress raisers
     
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  9. mtt.tr

    mtt.tr Member

    Messages:
    4,052
    Essex England
    Even if there was that such a huge chunk of cast seeing not masses of stress over all
     
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  10. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,884
    essex england
    Blanks to form foundry pattern for the 24” wheeling machine back from laser cutters C542C076-03A3-4282-8C68-052F3FC6B96C.jpeg
     
    maxiboy, Parm, cr500dom and 8 others like this.
  11. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,884
    essex england
    Mocking up one half of the foundry pattern BE446C29-D833-43A1-AA31-D314AAAA5A8B.jpeg 6919C854-6DAA-4622-958E-3450D365D9C7.jpeg
     
  12. cr500dom Member

    Messages:
    369
    Norfolk
    Cracking job
     
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