Creating the Cauls

In Vol 28, No. 164, on page 6 of Woodsmith magazine is the article which describes the Adjustable Panels Cauls.  It was sent in by George Johnson of Canton Oklahoma.  They give the dimensions and I followed them somewhat closely.  I visited my local Home Depot to buy the goodies I would need to make my cauls.  I purchased (4) seven feet long, 1 x 2, in hard maple.  I like hard maple.  I also purchased (4) 36 inches long ½ x 3 inch pieces of Oak.  I only needed one piece of the oak, but I wanted the other pieces for another project.  So only buy 1 if you don’t want extra, and to be honest, I didn’t use the entire one piece either, I only used 18 inches.

As for the hardware, I came very close to making a tightening handle blunder, when I nearly bought a handle with the male threaded rod attached.  This would have been a mistake.  The handles need to be female which allow the threaded part of the 5/16th carriage bolt to pass through.  Which brings me to the quantities of stuff I needed, the plans required 4 handles, 4 washers (I bought 8 to allow for losing a few), (24) #8, 1 ¾ “flat head screws (I bought a box).  I also bought a box of 1 1/4” flat head screw, because I didn’t believe the instructions.  The 1 ¾ looked way too long.  They were not too long and actually worked wonderfully.

Being new to woodworking, I lack confidence, so I bought extra stuff, which I didn’t need.  I then reinforced my fears when I purchased (3) 5” 5/16” carriage bolts and (1) 5 ½” carriage bolt.  I blindly trusted the little bin that told me I was buying 5 inch, and it was very sneaky in giving me a 5 ½ bolt.  I fixed the problem by buying (3) 5 ½” and (1) 5” the next day.  So I have an extra set that will allow for thicker boards to be in my glue up.  In the photos I used the 5 ½ inch bolt.  I may buy some longer ones too.  The reason one can’t just buy really long bolts is that the threads don’t go all the way down the bolt.  If I had bought a 7 inch, I wouldn’t have been able to tighten them all the way down.

So here is how I built my cauls.  I cut (8) 36” pieces of hard maple, using my Japanese hand saw.  I was amazed at how quickly it cut through each piece, and how beautiful the cuts turned out.  It was definitely the right tool for the job.

 I like sanding.  I have read that many woodworkers don’t like sanding their projects.  It is considered drudgery.  I took 2 pieces and clamped them into my vice and sanded the top to a nice rounded edge on the outside edges on the top side of the two pieces.   My reasoning was, it was a waste of time to sand the inside edges, so I didn’t.  I also didn’t sand the bottom edges, because I wanted them to remain flat.  So I sanded up each pair.  I used 80, 120, 220 grit paper and my mouse sander.

The next step was to cut off 1 ½“blocks from the piece of oak.  My Japanese hand saw handled this task as well.  The blocks are used as spacers between the pieces of hard maple.  There are 3 spacers per caul piece (top and bottom) and created the gap that allows the carriage bolts to be threaded up through the top and bottom.  It means that one is able to move the clamping handles in to the edges of the wood when clamping, to apply the most pressure onto the wood being glued up.

So with 12 pieces of oak cut, I stacked them together and sanded the tops, rounding the edges.  This was done for aesthetics.

The next step was to screw everything together.  I placed a spacer in the middle, at 18 inches and one on each end, set in 1 ½ inches from the edge.  I have no idea why they weren’t all the way out to the edge, but in the article, that is how George Johnson did it, and it looked good to me.  I then flipped the pieces of wood upside down, with the rounded edges on the table, and placed my oak spacers in the correct positions.  Next I clamped everything together, before drilling pilot holes.   I then used a countersink bit to drill out a bit of space for the flat head screws to set into the wood.  To make my life easier I got out both of my cordless drills, using one as a dedicated pilot holes driller and the other for the countersinking and the screwing in of the flat head screws.  ( I am not sure all of the verbs in the last sentence really exist, but I digress)

Once all of this was done, I just needed to cut some blocks to hold the carriage bolts.  The instructions called for 3 ½ inch blocks, but I had a lovely piece of hard maple that was 12 inches long, so I went with 3 inches for each block.  Yes it was a daring move, but I am not afraid to live life on the edge.  I sanded the 12 inch block before I made the cuts.  I also drilled the holes, first with a Fostner bit, then with a regular bit.  This meant that after I cut them into their 3 inch lengths, they were ready to go.

The last step was to check the flatness of the bottoms of each caul section.  I had focused on making sure that the tops were flat, because I intended to flatten any that needed it, using my router.  There was only one that needed flattening, so I used my 2 inch flush trim bit.  It is a really nice bit, made by Amana.  I spent $128.00 on this bit.  That seems like a lot, but I have already used it a bunch of times.  And it cuts like a hot knife through brie.

When I finally assembled the cauls, they looked even better than I had hoped.  Now I just need to find a project that requires a glue up.


I’m amazed, I have to admit. Seldom do I come across a blog that’s both equally educative and entertaining, and without a doubt, you have hit the nail on the head. The problem is an issue that too few folks are speaking intelligently about. I’m very happy I found this during my hunt for something concerning this.


It is useful to try everything in practice anyway and I like that here it's always possible to find something new. :)


I am not going to be original this time, so all I am going to say that your blog rocks, sad that I don't have suck a writing skills


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