Very effective and cheap shop made box joint clamping cauls

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Project by Jerry posted 04-06-2014 08:57 PM 8171 views 13 times favorited 9 comments Add to Favorites Watch

I used John Huffington’s method for modifying some ratcheting tie downs into band clamps, and then cut 8 pieces of half inch plywood to about 1.25×6”. I then attached velcro hook to each end of the cauls, spaced them so they would butt up against the box joint pins where they stand a little proud of the box, and attached loop velcro across the corner span. The reason for the velcro is that I found when I just used the cauls, the band clamps would pull them away from the corners as I tightened them down, so the velcro strap prevents this from happening.

I believe this method of clamping may be superior to the Rockler and other solid type box joint clamping cauls because they span the corner with a solid structure, and in my visualization of that process I believe that solidity may prevent the caul from compressing the box joint pins fully into the slots.

With these, the caul is free to move towards its opposite caul under the pressure of the band clamp without being hindered by a solid corner.

They ARE a little fidgety to get clamped up, but once they are positioned correctly and the pressure is on, they close the joint completely.

-- There are good ships and there are wood ships, the ships that sail the sea, but the best ships are friendships and may they always be.

9 comments so far

View Jim Jakosh's profile

Jim Jakosh

24980 posts in 3914 days

#1 posted 04-06-2014 10:05 PM

Great way to clamp around the entire box to pull the joints together!!..............Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View NormG's profile


6506 posts in 3812 days

#2 posted 04-06-2014 11:09 PM

Wonderful idea, thank you for sharing this idea

-- Norman - I never never make a mistake, I just change the design.

View aussiedave's profile


3114 posts in 2633 days

#3 posted 04-07-2014 01:57 AM

Great idea Jerry…cheep and effective, I would not have thought about Velcro to keep the corner pairs together.
Thanks for sharing.

-- Dave.......If at first you don’t succeed redefine success....

View Bluepine38's profile


3387 posts in 3894 days

#4 posted 04-07-2014 01:58 AM

Very good clamp set up, and they are close enough to the corners that as long as you do not overtighten
they will not bow the box sides in.

-- As ever, Gus-the 80 yr young apprentice carpenter

View IndianJoe's profile


425 posts in 3058 days

#5 posted 04-07-2014 10:52 AM

I need to try to this some day thank you for the post even if I don’t do the something keeping the blocks corner is a good thanking something for me to remember .. thank you

-- Nimkee** Joe

View Jerry's profile


3417 posts in 2456 days

#6 posted 04-07-2014 02:59 PM

Thanks everybody, I’m muddling my way through…

-- There are good ships and there are wood ships, the ships that sail the sea, but the best ships are friendships and may they always be.

View kiefer's profile


5735 posts in 3475 days

#7 posted 04-07-2014 03:00 PM

Looks like a innovative setup have to try that .

-- Kiefer

View a1Jim's profile


118104 posts in 4385 days

#8 posted 04-07-2014 03:06 PM

Good idea thanks for sharing that Jerry.


View Roger's profile


21030 posts in 3612 days

#9 posted 04-29-2014 11:22 AM

So simple, so gr8. Thnx for the post

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. [email protected]

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