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They look interesting. The idea seems pretty sound and that's not a bad price. The pressure pads are plastic so you couldn't put too much pressure on them but a couple of these about every 18-24" to keep the boards even plus a few regular clamps might work well.
 

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Oliver (Prof. Henry)
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I have them and use them occasionally. They work as described, but I find them awkward to set up and use. Trying to get both the top and bottom bars in the correct slots and determine which slots to use is very time consuming. If I had been able to try them before buying, I would not have made the purchase.
 

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I had 10 of them years ago that I bought at WoodCraft and would use them to glue up 5 cutting board blanks at a time when I was going through my cutting board phase.
They worked very well, but additional clamps had to be added sometimes to flush the boards at the ends.
Herb
 

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I bought a set (i.e. a pair) years ago, but only used them recently when gluing up some smallish panels. Agree with Oliver that they require “management” to set up - I am thinking of using sticks of somewhat thicker timber to keep the 2x2s apart, when inserting the next batch of boards to glue up. Otherwise a bit of cat-herding required.
Also agree with Herb that additional clamps may be required, especially if there is some bowing in one of the boards. I would have preferred parallel-jaw clamps, but those are hellish expensive in this neck of the woods, whereas these clamps (Chinese made) for once were about half the price here compared to the Peachtree price.
But in the final analysis, they do work as described.
 

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. The pressure pads are plastic so you couldn't put too much pressure on them but a couple of these about every 18-24" to keep the boards even plus a few regular clamps might work well.
Charles, I managed to get adequate pressure with two of these clamps on 60cm length boards. I somehow don’t think the plastic parts are the limiting factor, so much as the design. You will know much more about force vectors than I do, but I suspect that the force applied by the screw is split between the horizontal clamping force and the vertical aligning forces.
 

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Charles, I managed to get adequate pressure with two of these clamps on 60cm length boards. I somehow don’t think the plastic parts are the limiting factor, so much as the design. You will know much more about force vectors than I do, but I suspect that the force applied by the screw is split between the horizontal clamping force and the vertical aligning forces.
The amount of force applied to the tooth as opposed to the bar itself is proportional to the sine of the applied angle. I.E., the thicker the panel the more force on the bar and vice versa.

BTW, I have 4 Bessey parallel clamps and if I could find someone who had comparable lengths in Jorgensen clamps I would trade them even in a heartbeat. I really don't like those Bessey K body clamps. Trying to hold the head end in position while trying to tighten the mechanism with only one hand is very hard to do.
 

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I have two pairs of these and use them often. Yes, they are a little tricky to set up, but gets easier the more you do it. Depending on the size of your glue up there may be need for additional clamps. I especially like the versatility - you can make them about any length you want by the selection of your supplied lumber.
 

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Take a look at the Plano Vertical Glue Press clamp system. I've had a set for years. They work well, but are pricey. You need wall space to mount them. I would post a link, but I don't have enough posts yet.
 

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I have been using these 4-way clamps for years, with good results. But I find that you need to do 2 things to make set-up easier - firstly, clamp a 'back-stop' baton to the bench, and then use another suitably sized baton just behind the front 4-slot sections, to raise the set-up at an angle - this makes it easy to position the front clamps, and the back stop prevents movement of the whole structure.
 
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