Detailed plans available here:
kingsfinewoodworking.com/prod...
These are by far the strongest all wood clamps I’ve ever seen on KZfaq. They are stronger than the deep reach clamps made by Matthias Wandel & John Heisz, (that was a challenge guys ). And mine don’t have any metal in them!
Here is the Tap & die set I used for this job:
You can make these 12” deep reach C-Clamps with amazing strength for only $10.00! I was about to buy some for a project but the quality ones I found were $107.00 online, so I did some research and decided to make mine.
I studied some material properties, and of all domestics, oak has the second highest modulus of elasticity behind only hickory. With over 1.8 million pounds/sq.in. Modulus of elasticity defines the relationship between stress and strain, and effectively measures stiffness. The exact property you want in the arm of a clamp. I also found a study done with Fine Woodworking Magazine & Case Western Reserve University in 2007 measuring glue bond strengths. It utilized 6 glue types and different species of wood, 162 joints tested in all. Among the domestics, red oak combined with type 1 PVA glue (Titebond), had by far the greatest bond strength.
So, it was a no-brainer. Oak, is cheap as a hardwood. You can buy #2 common, because narrow sizes are all that is needed. And, many people have oak offcuts hanging around.
I did buy a 36” maple dowel for the screw thread. It was a 1-1/2” diameter. You could certainly turn one. But for me this was easier. And one dowel makes 2 clamps.
I made 2 clamps with the intention of testing them to destruction, but I didn’t have a strong enough scale. After I get one and do that, I think I’ll make 10 for my shop, and I’ll have paid less than buying a single one online.
I did cut all the threads and tapped the clamp. This is easy to do.
Things used in this build:
Tools:
Empire Framing Square - amzn.to/3XRfnvX
Woodpeckers Ruler 24 Inch - amzn.to/3DBUsp2
Woodpeckers Ruler 12-Inch - amzn.to/3wneQ9B
6-Inch Compass - amzn.to/3ZVfQ25
Kreg Trak and Stops Kit - amzn.to/3ZVgnkB
Kreg Self-Adhesive Measuring Tape - amzn.to/3DGNpLU
Rockler Wood Glue Applicator Set - amzn.to/3ws9Ctc
Bessey 24" Parallel Clamp - amzn.to/3XOyl6u
1-1/8" Wood Scraper - amzn.to/3R2Xjgr
DEWALT Bar Clamp - amzn.to/3Rgtzgd
Woodpeckers Square 8-inch x 5-inch - amzn.to/401kV9k
Grizzly Jointer - amzn.to/3j09TAk
Combination Square Set 6" & 12" - amzn.to/3kB2jfW
Plastic Jig Dowel Thread Tap Kit - amzn.to/3HstRgH
Ridgid Handheld Belt Sander - amzn.to/3Js0UD1
Ridgid 5-Inch Random Orbit Sander - amzn.to/3JefhdM
Grizzly 12" Disc Sander - amzn.to/3wsbjH4
Grizzly Bandsaw - amzn.to/3XUUobR
Wood Glue Dispenser - amzn.to/3D94pKz
BOSCH 12 Inch Sliding Glide Miter Saw - amzn.to/3j331SU
SUIZAN Japanese Dozuki Dovetail Hand Saw 6 Inch Pull Saw Tenon Saw - amzn.to/3iZY2Cl
Ridgid Trim Router - amzn.to/3wmJOyz
Materials:
Titebond III Glue - amzn.to/3wvDDIh
WoodRiver Pure Tung Oil Quart - amzn.to/3kFDHm8
36 Grit Resin Cloth Aluminum Oxide Sanding Belt - amzn.to/3kEKH2P
Sandpaper Set 5-Inch - amzn.to/3Wygb7S
Dowel Rods Wood Sticks Wooden Dowel Rods - 1-1/2 x 36 - amzn.to/3XpExC9
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Detailed plans are available on my website if you are interested in duplicating these. kingsfinewoodworking.com
NOTE: Matthias Wandel, and John Heisz are both fantastic woodworkers. Very intelligent and very creative. If you haven't seen their work, you should definitely check out their channels.
Matthias Wandel: / @matthiaswandel
John Heisz: / @ibuildit