This is an adjustable stool that is made with threaded joints. The legs are turned of 2" thick red oak and threaded with 1 ½" and 6 threads per inch on one end. The legs are 11¾" long. The base and seat are made of 1 7/8" thick red alder and 11½ " in diameter. The seat has a single threaded blind hole in the bottom and the top is slightly hollowed and the top edges are rounded over. The base has a hole centered and all the way through to accommodate the adjustable center pedestal. The extra set of holes were drilled at 10º and threaded with a tap finished with a bottoming tap. I determined that the angle for the short legs was too shallow and I drilled a second set of holes at 15º which produced a better angle and wider footprint. I can also use these holes when making other stools to check for the correct angle. The center spindle is made of 2" square by 18¾" hard maple is threaded into the seat, a small square section then goes to continuous threads that allows the seat to be adjustable from 29 ½" down to 19 ½". I could take an additional inch off the height by threading the shaft all the way to the square section but I would have to remove the same amount from the end of the center spindle because it hits the ground. The stool is finished with linseed oil and turpentine. I used beeswax on the threads but they still squeak.
The first stool was made as a shop stool with a lower footrest. The second is constructed in a similar manner, the base is of poplar and smaller in diameter and the top has a chamfer on its lower edge. The legs are drilled at 15º. This stool is made as a music stool and is adjustable from 18 inches to 28 inches.
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