I am finally nearing completion of my two mortising JIGs. The first JIG is based on a Woodsmith Plan. This plan contained the use of three toggle clamps. Instead of permanently anchoring three toggle clamps to the JIG. These were positioned near the three mounting edges: the straight line edge and the two opposing 45 degree angle edges. I had seen a similar plan that used a toggle clamp mounting block that could be moved to a different position. I decided use a toggle clamp block in my mortising JIG. It is held to the JIG with knobs screwed into fixed T-nuts. I designed that block yesterday.
Note: I see that I need to take an updated photograph of this mortising JIG. I have several cuts and updates made to the JIG since I took this photo.
I still need to cut two corners off along its top top outside corners so I can position the bock between two other knobs on the JIG. Once I have those corners cut I will disabled the block so it can be sanded and finished with shellac. Then reassembled for use.
I am also combing two plans together to design and make my salt mortise. I liked the simplicity of Gregory Paolini’s slot mortise design, but I wanted to have a better and more flexible way to adjust the height of the router mount; to move the router bit in the z-axis. Paolini’s used spacer blocks for this purpose. I wanted my JIG to be more adjustable Han that systems. I found a vertical crank method in the German woodworking magazine Holzwerken. That JIG was designed by Guide Hen. I bought two issues of the magazine that had the plan or versions of it so I could study it further. I decided to use the router mount and crank system with the Paolini’s design. Later I could fully implement the Hen design, if I felt my JIG needed an upgrade later.
I have cut the parts so I could see if I could understand the function of the crank based around a threaded rod and nuts. I used a threaded insert in my design instead of capturing a nut in wood block piece. Since my translations of German to English using Google translators were not that good, I had to experiment with the design. What I learned was that the the block at the end of the rod that was also fastened to the router mount had to be free of the threaded rod. A single threaded insert embedded in a block fastened to the lift’s frame was enough to move the router mount up and down in the z-axis. Now that the testing is completed for this function, I can begin to assemble the router lift parts. I believe I can complete its assembly today or at least by the end of tomorrow’s work inky shop.
Front view of router mount lift system: from Guido Henn’s article published in Holzwerken magazine.
Back view of router mount lift system.
Gregory Paolini’s slot mortiser: x and y – axis assembly…
-- --- Happy Howie