![]() My engineering students have been asking to complete this project in one of their classes next year. This lets us display the kids work for a little while in a public area of the school. ![]() Usually, if I start this project rolling the first week of school, we will finish up with a few weeks of the semester left. We will also cover a few other odds and ends topics that change or rotate in and out of my curriculum from year to year. I've found for my class the best pace has been as an entire semester project. If I just had the students work on this project alone and I didn't worry about teaching other manufacturing topics and skills, I could run this whole thing in a single nine-week quarter. I use this project as an entire semester of curriculum for my level two manufacturing class. I hope to show how we have learned to make these solid body electric ukuleles and share my thoughts and tips on running it as a project with a group of students.įirst up let's cover what you'll need with the. This is my attempt to put my scattered brain onto "paper." Because of that fact this project has mainly lived in my brain and on bits of scrap paper that cover my desks all school year. I'm getting much better as I approach fifteen years teaching, but still admittedly I'm not great. ![]() I'm not the most organized teacher in the world. (Sorry about that I was trying to make sure I covered everything.) I think the word count is close to 9000 words. Get your popcorn ready because this is a long one! This is by far the longest Instructable I've ever made. But, every year I run this project I get just a little bit better at making them and a whole lot better at teaching manufacturing with it. The ukulele below is the first one I ever built as a test to see if I felt I could run it in a class of 15-20 high schoolers.Īlmost ten years, and many electric ukuleles, later I still have basically no idea how to play a song on one. I had no prior experience with building (or really playing for that matter) any instruments. I teach manufacturing and engineering classes.įor almost a decade I have been using this project in my classes. At that point pipes begin to be sized by outside diameter instead of inside diameter: every inch from 14 to 20 inches OD, then every other inch to 30 inches OD.I'm a high school industrial technology teacher in Indiana. The standard also defines larger pipes: every whole inch to 12 inches. A tolerance of plus or minus one turn is allowed, and in practice threads are often routinely cut shorter than the standard specifies.Īll dimensions are in inches. The table shows the distances and number of turns called for in the standard. For workers, instead of these distances, it is more convenient to know how many turns to make by hand and how many with a wrench. It also specifies another distance, the engagement, the distance the pipe can be screwed in by hand, without much effort. The standard specifies this distance, the effective thread. The taper is ¹⁄₁₆ inch in an inch, which is the same as ¾ inch in a foot.īecause of the taper, a pipe can only screw into a fitting a certain distance before it jams, unlike threading a nut on a bolt. The bottoms of the threads aren't on a cylinder, but a cone they taper. To accomplish this, the threads become shallower the farther they are from the end of the pipe or fitting. Many pipe threads must make not only a mechanical joint but also a leakproof one. The word “taper” in several of these names points to the big difference between many pipe threads and those on bolts and screws. In the United States, the pipe thread standards are: NPTĪmerican Standard Straight Coupling Pipe ThreadĪmerican Standard Taper Railing Pipe ThreadĪmerican Standard Straight Mechanical Pipe ThreadĪmerican Standard Straight Locknut Pipe Thread If “LH” is added, the pipe has a left hand thread. For example, “½–14 NPT” identifies a pipe thread with a nominal inside diameter of ½ inch and 14 threads to the inch, made according to the NPT standard. Pipe thread sizes are described much as bolt sizes are, although the shapes are different. ☙ Share this page on Facebook American pipe threads
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