I don’t have the KliKlamp
Instead I have a track saw clamp.
For the track saw clamps, we have to do a specific procedure.
Try the same procedure on your KliKlamp.
( as shown in the marked-up photo )
#Defect clamp?
ruby dew
@frigid badge see above
frigid badge
It is possible the cam action on the black part is wallowed and it’s effectively dead, also
ruby dew
A bit more clarification in the procedure.
I was having trouble using the track clamps until I followed these steps.
Since it seems similar, worth a try.
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Slide the Klik handle against the material so that it is in a ready to clamp position.
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Then Push at that yellow arrow point
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While holding the shaded bar, squeeze the handle to engage the ratchet mechanism
frigid badge
If that’s true the cam is shot
left seal
Yes
frigid badge
The clamp creates its locking force with a “cam” a spiral or offset circle that applies more force at a point when rotated. These cams are usually of a material that can accept some compression to improve that application, but that also means excessive or repeated force will wear or damage the cam and make the clamp ineffective
livid compass
That can be expected off any clamp with plastic clamping components
zinc inlet
Two possibilities-- either it was way over-tightened in the past and is blown out, or you are currently under-tightening it so much that the lower jaw isn't able to fully engage against the bar.
frigid badge
As before, it's a cam clamp. There is a ovoid or similar shape structure beneath the bottom jaw of the clamp. When you rotate the handle in you're engaging the "taller" section of the ovoid which applies the clamp's pressure. All clamps basically use a lever with a constraint to create similar pressure, yours is limited in capacity by the difference in the ovoid shape rather than a screw engaged lever.
Because of this limitation, it makes identifying the issue rather simple. (In no particular order)
1) The point where the lower jaw meets the bar.
This is the pivot point and can be prone to slipping on traditional bar clamps. It is possible it is slipping due to tooth wear. With a clamp action and force as this one, that would be surprising to me, but it's possible.
They could also be full of glue or other crud, which seems more viable if I ignore that the clamp effectively looks close to new in the picture.
2) Overclamping
Because the ovoid cam on your clamp appears to be made of plastic, it will be prone to damage from overclamping. When I say prone, I mean quite literally a single incident of over-clamping could render the clamp useless forever. The force being applied 'by' the clamp is being focused entirely on the ovoid. If you apply too much of that the ovoid will deform and render the clamp incapable of applying that force again.
3) Underclamping
This one is similar to #1 in that it relies on the pivot point of the clamp being well-advanced towards the clamped object so that the cam does not need to overcome allowed motion range from the bottom jaw. This was the point Macboy made, meaning that you need to ensure that pivot point has been advanced sufficiently to allow the cam to do it's job.
4) Impossible to identify on the internet problems
These would be very unlikely but equally apparent to you, the person holding the thing. Something like a broken head or top bar that is absorbing or creating range of motion the cam cannot overcome.
That's it, that's the list. Please try not to argue with the potential causes of a problem that you're unable to diagnose yourself and have people providing the entirety of possible problems to which you've rejected all of.