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 Post subject: Strange clamp
PostPosted: Oct Thu 15, 2020 12:36 am 
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Location: Richmond, Va.
Strange clamp 10-14-2020 2 sm .jpg[/attachment]I found this strange C clamp at a Hamfest (that's the radio connection). The handle rotates only about 45 degrees allowing the shaft to slide up and down. Turning the shaft back locks it, but does not put any pressure on anything clamped in it. Can anyone tell me what it is for? CharlesD


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 15, 2020 12:41 am 
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Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
It "looks" as if it is a quick release C-clamp. There should be a threaded collar between the shaft and the clamp body. The shaft should rotate 90" CCW, then lock against the threaded sleeve allowing it to loosen the clamp. The the clamp should slide in against the clamped part, rotate 90'CW and then start turning the threaded sleeve to tighten. I'd say your threaded sleeve is rusted and not turning.


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 15, 2020 12:53 am 
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Joined: Jan Sat 25, 2020 5:23 am
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Location: Colorado Springs, CO 80917
Apparently it's intended to clamp something that is compressible.


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 15, 2020 1:49 am 
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Location: Mountains of Mourne. Ireland.
In my neck of the woods they are known as G-cramps... as old as the hills.


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 15, 2020 4:04 am 
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Location: Vancouver Island, Canada
Right, quick release would be handy in a production setting. It's a keeper.

Here are some standard C-clamps. The rusty ones I inherited, almost never use but will not sell. Modern bar or pipe clamps are quicker to clamp and release and have a much wider range.


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 15, 2020 12:28 pm 
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Location: Sunbury, Ohio 43074
Worth soaking in EvapOrust, or even vinegar. They are pretty nice clamps when working properly

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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 15, 2020 4:25 pm 
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Joined: Dec Sat 28, 2019 4:18 pm
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Location: Corinth, TX
westcoastjohn wrote:
Right, quick release would be handy in a production setting. It's a keeper.

Here are some standard C-clamps. The rusty ones I inherited, almost never use but will not sell. Modern bar or pipe clamps are quicker to clamp and release and have a much wider range.

You can never have too many clamps,

John


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 Post subject: Re: Strange clamp
PostPosted: Oct Sat 17, 2020 3:24 am 
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Joined: May Mon 25, 2020 7:37 pm
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Location: Boston, MA
KX5JSC wrote:
westcoastjohn wrote:
Right, quick release would be handy in a production setting. It's a keeper.

Here are some standard C-clamps. The rusty ones I inherited, almost never use but will not sell. Modern bar or pipe clamps are quicker to clamp and release and have a much wider range.

You can never have too many clamps,

John
So true. I always seem to have one fewer clamp than I need.


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 Post subject: Re: Strange clamp
PostPosted: Oct Sun 18, 2020 9:13 pm 
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Location: Thornhill, Ontario, Canada
Barry H Bennett wrote:
Worth soaking in EvapOrust, or even vinegar....
+1 Over the years I've run into several quite rusty G-clamps... they've all cleaned up well with just oil and rubbing the rust off. They all work fine. The cleaned-off rust leaves a "browned metal", a bit like the old gun barrel finishes.
Cheers,
Roger

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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 22, 2020 1:20 am 
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Joined: Dec Sun 29, 2013 10:11 pm
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Location: Richmond, Va.
Many thanks to all who offered suggestions for my rusted clamp. Is indeed a G clamp, with the threaded collar well rusted in place. I've tried soaking in vinegar for three days, and using Blaster at the threads. So far, no luck. I'll keep trying. CharlesD


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 22, 2020 5:55 pm 
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Location: Sunbury, Ohio 43074
might have to use a little heat. Dry it out, and with a heat gun on high warm up the outside of the threaded part while trying to exercise the screw. Might need to put the whole clamp in a vise, and use a vice grip or other kind of "handle" to get a little more leverage. You're not trying to make it do a full turn... just break loose enough so the rust solvent will work once it cools down a bit.

I've seen folks (like me) use a torch and get the outside red hot.... but that's a last resort. It usually works, but occasionally results in a puddle of metal on the floor. :-D. Not entirely by accident.............although if it's cast, it may melt when least expected.

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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 22, 2020 7:10 pm 
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Joined: May Mon 25, 2020 7:37 pm
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Location: Boston, MA
Try soaking the frozen section in Kroil for a few days. Good chance it will loosen right up.


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 22, 2020 9:13 pm 
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Location: Haledon, NJ, usa
To me it looks like a clamp that can be positioned deeper or less deep very quickly.
Instead of having to turn the treads many times for several inches or more, it looks like you turn just a single tun or so to loosen it, then twist the threaded area to the side and slide the shaft to the next needed position.

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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 22, 2020 11:40 pm 
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Location: Thornhill, Ontario, Canada
CharlesD wrote:
... the threaded collar well rusted in place. I've tried soaking in vinegar for three days, and using Blaster at the threads. So far, no luck. I'll keep trying. CharlesD
WD-40?
Cheers,
Roger

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Thornhill, Ontario
Ontario Vintage Radio Assoc. http://www.ovra.ca


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 Post subject: Re: Strange clamp
PostPosted: Oct Thu 22, 2020 11:57 pm 
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Location: Bridgman, MI
I might have missed it.. if the teeth are offset or depends on teeth size/angle. this could be used to apply a certain amount of toque by slipping, no? i could see that. - like a clutch

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