Very effective and cheap shop made box joint clamping cauls

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Project by Jerry posted 04-06-2014 08:57 PM 3721 views 11 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

14393 posts in 2195 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


5086 posts in 2093 days

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

Wonderful idea, thank you for sharing this idea

-- Norman

View aussiedave's profile


3109 posts in 913 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


3223 posts in 2175 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 76 yr young apprentice carpenter

View IndianJoe's profile


425 posts in 1339 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


1253 posts in 737 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 (online now)


4219 posts in 1756 days

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

Looks like a innovative setup have to try that .

-- Kiefer 松

View a1Jim's profile


113829 posts in 2666 days

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

Good idea thanks for sharing that Jerry.

-- Custom furniture

View Roger's profile


17851 posts in 1893 days

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

So simple, so gr8. Thnx for the post

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

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