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Needing the screw part of a clamp

Discussion in 'Tools and Materials' started by DIYalot, 1 Jun 2021.

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  1. DIYalot

    DIYalot

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    Hi. I'm wanting to make something that utilises the screwing part of a G-clamp. Unless I can obtain only that part I'll have to buy a clamp and cut off from it the screwing part along with the threaded hole, and weld it to my "concoction". So, unless anyone can advise on a better approach, I think my only alternative is to buy and dismember a G-clamp. I think it needs to be a pressed steel clamp. Thanks for any insights. Screw thread needs to be about 50mm long.Rich
    EDIT1: Not sure if "drop forged" clamp would do. Material must be weldable.
     
    Last edited: 1 Jun 2021
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  3. Tigercubrider

    Tigercubrider

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    I know that in the USA there is a brand of clamps that is sold for the user to utilise steel pipes.
    So you buy an end and the bit you're after.
    Might be cheaper to buy a diy shed G clamp made in China tough?

    What are you trying to do?
     
  4. Tigercubrider

    Tigercubrider

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  5. SFK

    SFK

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    Without knowing what you want to make very difficult to recomend.

    So my question is -
    can you use 'threaded bar' or 'threaded rod' and weld nuts onto your 'something'?
    https://www.screwfix.com/c/screws-nails-fixings/resin-fixings/cat840022#category=cat840126

    Or if nuts are too small (so leverage would cause them to break off),
    can you use threaded rod and a weldable mild-steel block that has been hand tapped?:
    https://uk.rs-online.com/web/p/threading-taps/5089474/


    Otherwise G clamps are cheap (no idea what they are like to weld to).
    https://www.screwfix.com/c/tools/cl...g&cm_sp=managedredirect-_-handtools-_-gclamps
     
    Last edited: 1 Jun 2021
  6. crank39

    crank39

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    You can buy the treaded rod - its got absolutely nothing to do with the roadrunner but its called ACME thread, you might even find the female part too
     
  7. SFK

    SFK

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  8. SFK

    SFK

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  9. JobAndKnock

    JobAndKnock

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    Or even cheaper, cramp heads (yet another option)
     
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  11. DIYalot

    DIYalot

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    Hi. I'm making a 900mm x 600mm flag lifter. Cheapest option would be to buy 2" G-clamps and buy appropriate nuts. Because I'm pretty sure the boss of the regular G clamp won't weld. Here is my choice of G clamp - (I'd have to temporarily remove the handle to get the thread to go thru the nut) - https://www.amazon.co.uk/gp/product/B000LFRVQ0/ref=ewc_pr_img_1?smid=A3JQLF5XLTXD27&psc=1

    EDIT1: I'm hoping it comes with plastic pads
    EDIT2: I'd have to figure out the thread. Or ask Silverline.
     
    Last edited: 2 Jun 2021
  12. Tigercubrider

    Tigercubrider

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    Most flag lifters work on the raildog principle, a scissor action?
    I assume that your design uses the screws to tighten a clamp along the edges?

    With scissor action the weight of the flag is also the holding force
     
  13. SFK

    SFK

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    100% agree - doubt that a clamp will provide enough pincer force.

    However if ant intio try could try two sash clamps with slighly longer (and sloped?) plates welded omnto its plates:
    https://cpc.farnell.com/search?st=sash clamp

    SFK
     
  14. crank39

    crank39

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    Don't think the OP is planning on using the G clamp as the flag lifter but just the threaded part of the clamp and the bit of the clamp the thread runs through to possibly make a scissor type contraption, agree it needs to be a heavy duty thread though hence why G clamps were mentioned(to pinch the threaded rod from)
     
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  15. Tigercubrider

    Tigercubrider

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    I guess you could make a traditional scissor clamp but then use a diamond style screw jack to push the cross point of the scissor upwards? That would pull the sides of the scissor clamp inwards as the cross rises? Normally the lift action of two people (ideally) causes the gripping action

    https://www.amazon.co.uk/Scissor-Li...t=&hvlocphy=1007009&hvtargid=pla-947471392265

    I'd use a cordless impact driver to open and close it.
     
  16. Tigercubrider

    Tigercubrider

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    If you had a couple of smallish barrow type wheels you could maybe make a kind of trolley that's similar to a see saw on wheels. One end attached to your clamp, wheels close(ish) and a long lever handle to allow you to push down and manoeuvre your hopefully clamped slab
     
  17. DIYalot

    DIYalot

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    This contraption will lift a flag, but also place it. Just a frame, slighly longer on one side that has two screw jacks Not a scissor clamp.
     
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