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  1. #16
    Join Date
    Mar 2018
    Location
    italy
    Age
    54
    Posts
    7

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    grazie ancora per i preziosi suggerimenti e la collaborazione, se c'erano amici che avevano creato una struttura simile ti invito a partecipare, non ho iniziato a realizzarlo come dovrei andare a un tornitore per farmi realizzare alcuni pezzi per il supporto perni la boccola da saldare sul braccio della trave, devo trovare grossi bulloni da cambiare per fare i perni di giunzione per fare i vincoli per la mensola, i supporti e altri componenti grazie ancora saluti alla prossima spero presto



    $_72.JPG

  2. #17
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

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    Hi Athos
    I worked in a workshop that owned a hoist frame similar to the blue one shown. I suggest avoiding that design.

    The small castor wheels are the Achilles heel of the unit. They must be large enough to get them to roll easily.

    Our frame wheels were far too small, that had had no rolling bearings on the wheel axles.

    In addition, the castor wheel "tires" should be hard enough resist the flattening under the load.The rubber castor wheel tires fitted to our frame were far too soft and resisted that inertia needed to roll the frame.

    We had to use a crowbar to lever the frame to facilitate movement.We had a few people there and movement was still difficult.Moving such a frame alone will be difficult.

    Using all large steel wheels with a ball bearing axle would make the frame easy to roll.

    Grahame

  3. #18
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

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    I agree with Grahame. If you do build that style you want some decent castor wheels on there, you can get them but they can get expensive.

    Even my engine stand with steel wheels without bearings is a pain to move around when loaded. One day I will fit some decent ones to it.

  4. #19
    Join Date
    Oct 2008
    Location
    N.W.Tasmania
    Posts
    1,407

    Default

    Quote Originally Posted by Com_VC View Post
    I agree with Grahame. If you do build that style you want some decent castor wheels on there, you can get them but they can get expensive.

    Even my engine stand with steel wheels without bearings is a pain to move around when loaded. One day I will fit some decent ones to it.
    I too agree with the other comments made above, but a compromise might be to fit jacking bolts to the caster wheel positions, so that the gantry could be supported when actually lifting a load. This would relieve the wheels of high loading forces, but would prevent mobiling with a load. In my view that is not such a bad thing, as these smaller crane units are often pretty unsafe if used to carry a load anyway, and you always have the option of setting the load down, re-arranging the gantry and re-lifting the load, and shifting it along the beam. Obviously this is only a viable option if distances are short.
    I would also like to make a comment on the gantry pictured above as Attachment 372518. I think that the stays are a bit too short, one effect being to put more stress on the bottom plate under the column, rather than transferring the forces to the ends of the plate above the castors.

  5. #20
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

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    I built a gantry similar to the blue one above. For wheels I used 6" metal wheeled casters. Unloaded it moves easily on flat concrete. Mine is also the variable height design and works well.
    I'll comfortably move it around with light loads up to around 500kg, but anything above that I lower the load and move it with a pallet jack or skates then relocate the gantry for the next lift. Its not a comforting feeling if you get the load swinging on one of these while trying to bump it across the floor.
    When relocating my lathe I had to negotiate a 100mm difference in floor heights, so I put one end of the gantry on each piece of floor and leveled the beam then rolled the load along the beam. The lathe is 1.2T and even with a decent girder trolley it didn't want to roll particularly easily. A girder trolley with a driven wheel and endless chain or similar would have been nice to move it along the beam with more control.

    Steve

  6. #21
    Join Date
    Jul 2014
    Location
    melbourne
    Posts
    110

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    you need to be very careful using jib cranes, i have seen many time myself, me included they can take awhile to get used to , more so when turning a large heavy item on the welding bench or on welding trestles, have seen jib cranes and jobs bouncing off walls back and forth.
    they can run away by themselves if chains snatch, all part of learning keep hands feet well clear

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