Very effective and cheap shop made box joint clamping cauls

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Project by Jerry posted 136 days ago 1924 views 8 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.

-- I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone.

9 comments so far

View Jim Jakosh's profile

Jim Jakosh

11284 posts in 1731 days

#1 posted 136 days ago

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


4088 posts in 1629 days

#2 posted 136 days ago

Wonderful idea, thank you for sharing this idea

-- Norman

View aussiedave's profile


3014 posts in 449 days

#3 posted 136 days ago

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

-- Dave.......Keep calm and make more sawdust....

View Bluepine38's profile


2876 posts in 1710 days

#4 posted 136 days ago

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 75 yr young apprentice carpenter

View IndianJoe's profile


425 posts in 875 days

#5 posted 136 days ago

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


529 posts in 273 days

#6 posted 136 days ago

Thanks everybody, I’m muddling my way through…

-- I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone.

View kiefer's profile


3026 posts in 1292 days

#7 posted 136 days ago

Looks like a innovative setup have to try that .

-- Kiefer 松

View a1Jim's profile


112010 posts in 2202 days

#8 posted 136 days ago

Good idea thanks for sharing that Jerry.

-- Custom furniture

View Roger's profile


14318 posts in 1429 days

#9 posted 114 days ago

So simple, so gr8. Thnx for the post

-- Roger from KY. Work/Play/Travel Safe.

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