I recently just participated in the Dovetail Layout Tool Swap where I made a few items for LJ AgentTwitch. On the marking gauge I had made a couple of thumb screws and a few people were asking about them, so this blog will show how they were constructed.
I have a lathe, but I’m a relatively new turner and don’t have all the bells and whistle yet, so I’m sure there is a fancier way to achieve this, but this is what I had – a 2×4.
Traced a hockey puck – Go Avs!
Cut it out on the band saw and turned it round between centers
Once it was round I switched to the standard jaws that came with my Nova G3 chuck.
Drilled a hole in the center using my lathe which I didn’t get a picture of, but is by far the most crucial part of this whole procedure. If it’s not dead center everything else will be off. Once the hole was drilled I used a tap to thread it.
Then I took an appropriate sized washer and bolt and screwed it through the back of my jig.
Jig is complete, so now onto turning. I bought a pack of 5/6 – 18 threaded thumb nuts off ebay.
I took one of these and I screwed it on my jig and hollowed out some of the inside.
Then took off the nut and set it aside for the moment. At this point I took a small piece of wood. Drilled and taped it to 5/6 -18 and then screwed it onto the jig. Rounded it, and made a mating shoulder to the nut I just hollowed out.
Once that fit snugly I used epoxy to glue them together.
After the epoxy was dry, I roughed in my wood shape. then I applied epoxy to some brass all thread and screwed it through the whole set up and let it dry.
After that dried I removed the bolt from the back of my jig and screwed my new thumb screw into the front of the jig
And turned it to it’s final shape.
Here is a link to my finished project if you’re interested.
Thanks for looking, and I’d love to hear some other tips and tricks about how others do this sort of work.
-- I came - I sawed - I over-built