Something that peaked my interest during the holiday break was Bourbon and Whiskey. I was driving back from Austin one day and saw a sign for Bone Spirits Distillery in Smithville, Tx. I stopped and was interested in a local distiller using local corn to produce whiskey, gin, and bourbon. I talked to the owner and he explained how everything is local with the exception of the Rye because you can’t get good sweet rye grass in Texas. The conversation spurred a thought in my head. If we are starting to get local distillers who are producing white whiskey there might be a need for building or buying an aging cask to blend my own bourbon.

There appear to be a bunch of casks available through Amazon or others (Barrels Online, The Barrel Mill, and Deep South Barrels [Pearland, Tx]) for $50-$150 depending upon the size (1 liter – 20 liter). The idea is that you purchase an oak cask that has been charred on the inside and you fill it with the blend that you want. The char of the oak adds flavor and color to the white whiskey to create a blend that you want.

The idea of creating my own blend appealed to me so I ordered a 1 liter cask. The jury is out on how well it will work. The idea appealed to me so much that I wanted to figure out what it would take to create a cask/keg on my own. I started studying the woodworking details and skills needed to build an aging barrel or smaller cask. It turns out that this is a century (literally century) old process. The early woodworkers were called coopers because they hand cut the wood with hand tools to create barrels. I wanted to see how difficult it would be to build a barrel using modern tools like a table saw, band saw, welder, and other tools.

My initial research shows that a barrel consists of a number of boards that are shaped narrow at one end, fat in the middle, and narrow at the other end. A metal band is placed around the narrow end to pull the wood together and help make it water tight. The construction does not require glue or any adhesive, just wood, moisture, and metal bands to keep everything together. These boards (called staves) have a very predefined configuration so that the fat ends fit together and allow the barrel to roll easily since they are relatively large and heavy. The narrow ends pinch together with a metal band and are pushed out with a circular board that act as the ends of the barrel. The cuts seem relatively simple.

I wanted to figure out how complex the cuts were so I started with something a little simpler. Given that a barrel or cask is wide in the middle and symmetric getting smaller at both ends I should be able to build half of this and test fitting everything together before doing a full barrel. Surprisingly this is the design of a wooden bucket or wooden planter. There are plenty of samples and references for wooden buckets.

I wanted to start with something simple and work my way up. The easiest was to build a four sided “planter box” that was 4 inches wide at the top and 4 inches wide at the bottom. This would create a simple 4 inch by 4 inch by 4 inch box. I used cedar to create this since it is inexpensive wood and could be used as a planter box. The cuts were simple. The first cut is to get a piece of wood that is wider than four inches and cut four of them to four inches in length. The cut is a 90 degree cut to create the height of the bucket. The next two cuts are done at 45 degrees to create the sides. The first cut creates the reference width. The second cut is done so that the longest edge of the cut is four inches long. The resulting board is four inches tall with flat cuts on each end. The sides are cut at 45 degrees to allow you to fit each side together to form a box.

The resulting box looks very simple but does require glue to keep it together. A band around the box will keep the bottom in but will not hold water at the top because it is difficult to get pressure on the joints with a square band across the top and bottom.

A more challenging cut is to do a tapered box with a 4 inch top and 3 inch bottom. The design is a little more elegant and visually appealing. Again, this design requires glue to fit together but does allow us to practice angle cuts and take the next step in creating more staves or sides to round the bucket more.

The math behind this construction is a little more complex but not that much more. If we look at each piece of wood we will first cut four 4 inch pieces of wood to get the 4 inch height. We then draw a line from the top corner to half inches inside to get a three inch bottom. You can calculate the cuts required using geometry or cheat and use an online cutting guide. We do have to use a little math to use the online guide. It asks for the number of sides and angle. To get the angle we need to figure out what a 4 inch top and 3 inch bottom angle generates. We can do this because we know the adjacent height (4 inches) and opposite width (1/2 inches) of the triangle that we are trying to create. From this we can calculate the angle as tan(angle) = opposite / adjacent. This correlates to angle = arctan(0.5/4). In Excel this would be =atan(0.5/4) which yields 0.12435. Unfortunately this returns a value in radians which means nothing on a table saw. We need to multiply this by 180 and divide by pi. In Excel this would be = atan(0.5/4)*180/pi(). This yields 7.125 degrees. Note that changing the height of the bucket will change the angle. If we plug in 4 sides and 7.125 degrees into the jansson.us N-sided box calculator we get a blade tilt of 44.6 degrees. This is difficult to measure but if we set the blade tilt to a notch short of 45 degrees it should work.

The two resulting boxes came out well using cedar. I am using blue painters tape to hold the sides together. The intent of this prototype is to get a basic shape and make sure when we go to more sided boxes we fit within the same space. Our next test will be a six sided box of the same dimensions.

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