We will not speak about rotating knives and jugglers in this instruction, but anyway, it will seem interesting to you. Here I will describe the process of creating a rotating stand for knives with a self-made bearing. The stand has the shape of a cylinder, its base diameter is about 18 cm, and its height is about 25 cm.
Tools and Materials
You will need the following tools:
A circular machine with a cutting depth of at least 6 cm (the hand-held circular saw most likely will not cope with the task).
Wood turning lathe (with a spindle height of at least 10 cm).
Belt grinding machine.
Rasp (or well sharpened Turning chisels).
And the following materials:
Bars of any hard hardwood - at least 8 pieces 6 cm in size x 6 cm x 20 cm (I had 2 beech blocks of 1.9 m each).
Board made of the same wood type (approximately 20 cm x 20 cm x 1.9 cm).
About 50steel balls with a diameter of 1 cm.
Varnish for wood.
Design and calculations
To create a knife holder, you need to cut the grooves in the bars, and then make slanting slices so that the glued 8 pieces create a circle. The picture above shows schemes for bars. The width of the bars and the depth of the cuts are presented for different options: for the ideal octagonal version and the minimum version (their differences can be seen in my picture). A complete octagon can be glued easier, since its parts can be fitted to common ribs, but this option requires more material and a deeper cut. The distance between the slanting slices is very important for the final diameter of the stand. To create the bearing, you will need to do 2 identical V-shaped gutters in the base and in the block stand with a lathe. Then steel balls will be inserted into the space between the base and the block.
At this stage you will need to adjust the bars to exactly the same size and polish them so that they can be glued tightly. First of all, create a groove for the groove required depth (d) exactly in the middle of the bar. Then turn the bar over and make oblique cuts at an angle of 22.5 degrees. The center of the gutter should be equal in the middle of the space between the slanting cuts. Now you need to cut the bars to the same length (my length was 22 cm). The base is an ordinary board, in the center of which you need to drill a hole to put it in lathe and turn a rough circle (1 cm wider than the desired radius of the finished knife stand).
Apply a large amount of glue to all the prepared bars and place them next to each other with adhesive tape. Since the slanting slices are unlikely to be perfect, you will have to glue the two halves separately, then sand them to get smooth surfaces, and after that start to glue. So you can avoid the gaps between the parts. After applying the glue, take the two half halves, place a few sticks between them and pull them together with straps. When the glue dries, grind both halves with a grinder and glue them, using belts again.
Processing the block and the base of the stand
It may be difficult to place the block on a lathe. To simplify the task, I took a small piece of wood and placed it in the hole on one side of the block. After that, you can start processing using a large semicircular chisel at the beginning of the work and a finishing chisel at the end. so that these surfaces become completely smooth and you do not have to bother with grinding for a long time later. At the bottom of the delivery unit, cut a small V-shaped groove (about 5 mm deep) containing steel balls. After processing the base of the stand, cut into it a groove of exactly the same diameter as on the unit (also depth about 5 mm.)
Final touches and future plans
It is likely that minor roughness will remain in the grooves during alignment of the upper and lower parts of the block. To eliminate them, I used a small file. After grinding the upper part, I covered the block and the base of the stand with several layers of varnish using a sprayer.
Then it remains only to put steel balls in the chute at the base, put the block on top, insert the knives - and voila: you have a rotating stand for the knives of your own production. Future plans.
Watch the video
If I ever decide to make another stand, I will try to make it convex, in this case the knives in the slots will be noticeable.