Needing the screw part of a clamp

[DIYalot]

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.

 

[Tigercubrider]

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?

 

[Tigercubrider]

https://www.amazon.co.uk/QWORK-Pipe...jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

 

[SFK]

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

 

[crank39]

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

 

[SFK]

Crank - you remindned me

you might even find the female part too

Long Nuts are called 'Connector Nuts' - here is a M12 version:
https://www.toolstation.com/connector-nut/p35943

 

[SFK]

And one last option:
could you modify a Sash clamp:
https://www.amazon.co.uk/s?k=sash+clamp&i=diy&ref=nb_sb_noss_1

 

[Deleted member 174758]

Or even cheaper, cramp heads (yet another option)

 

[DIYalot]

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.

 

[Tigercubrider]

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

 

[SFK]

With scissor action the weight of the flag is also the holding force

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

 

[crank39]

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

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)

 

[Tigercubrider]

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.

 

[Tigercubrider]

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

 

[DIYalot]

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.