I saw a plan for a nut cracker on Instructables last week and decided that I would make one, or two, or three....
Once I got going, I decided to adapt the idea to make a more rustic style nut cracker.
To make a wood screw nut cracker you do need one piece of specialized equipment, and some drill bits and a drill press. You need either a thread box or...some other method of cutting threading on a dowel and tapping a hole. I have a thread box and matching tap.
I began these nut crackers by threading a length of one inch hardwood dowel after reading variety of blogs taking about cutting good crisp threads with a thread box.
I took the dowel and soaked it in vegetable oil for a week as suggested by a blog. The threads cut very crisp but...the dowel did swell a bit and fit very tightly in the thread box. Next time I will soak the dowel for 3 or 4 days in hopes that the outside is soaked but not too swollen.
Cutting the thread was the most difficult part of these projects. It is very difficult to get a good grip on round oily wood. I had to clamp one end of the dowel with vice grip pliers, which tore it badly. I threaded about twice as much dowel as I needed so I could pick and choose this time and so that I'd have some in hand for a later project.
With threaded dowel in hand I picked a piece of six inch black locust for my nut cracker. I cut one end square and left the top on a bit of an angle, just for the 'look'.
Next I used a Forestner bit to drill a hole down the end grain.
Drill slowly and clamp the wood firmly when drilling.
You can see the branch clamped to drill the side hole, that will be threaded. I use a wooden hand screw since it will hold irregular shapes better.
I used the matching tap to thread the hole. Again the branch needs to be held firmly, and the tap started straight and carefully.
I glued a piece of barn board onto one end of the threaded dowel and await the final setting of the glue. Once the glue sets I'll shape the knob a bit. On this nut cracker I drilled an opening on the opposite side for the dowel to fit into. This way when not in use the dowel is totally buried and takes up less space on the table as well is protected from being broken if dropped.
I learned something important while experimenting, I could not cut threads into end grain, I had to cut thread across the grain. End gain just tore and was useless. I found that problem in maple, maybe other woods would work better, I'm not going to bother trying.
I thought I would add a photo of my bench in process.
When I am working on something 'new' my work space becomes chaos. I am forging ahead full steam and don't put things away as I work. Also when I am working on something new I usually end up with about twice as many tools at hand than I end up needing. For example I only needed three Forestner drill bits but I didn't know which ones for sure so I brought the whole box off the shelf. I had things to clamp but started with the wrong type or clamps that were too small. They are there on the bench. There are knives, chisels, saws, glue bottles, and various pliers. Most of which will stay on the shelf the next time I do this sort of project, everything will look much more professional, next time.
At the end of today's work it took 20 minutes to clean up and put all the tools where they live. This style of working is not a habit a new woodworker should cultivate and one an old wood worker should try and break. (maybe a new year's resolution)
I think these will be popular Christmas gifts .
cheers, ianw
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