It's not that I am THAT old, because the new style draft pencils were available but the teacher didn't like them.
Not even the nice new mechanical pencils with the fine leads that come in different sizes and hardness, but with the old style mechanical pencils with the long heavy leads that had to be sharpened and were placed in mechanical pencils with extendable mechanical jaws to hold them. When I first learned drafting it was by using paper and mechanical pencil. I will cover both the first way I learned to do it by drafting out the pattern and using the mathematical formula I eventually found to determine the measurements and creating the pattern. In this instructable I will show how to layout the pattern to cut a pipe for a saddle cut. Well, I didn't remember the formula right off, but I did remember how to figure it out without a formula. He knew there had to be a mathematical formula to do it and knew I might know where to find it. The resulting pattern will look like the profile of a saddle, a curved center section that goes over the second pipe and two curved sections that extend down on either side.ĭad's project had a smaller HDPE pipe that would be used as a form to pour concrete around an orchard valve over the larger cement supply pipe. A saddle cut is a way of cutting one pipe to match the outside curved surface of another pipe. This last summer I was contacted my father who needed to layout the pattern for a saddle cut for an irrigation system he was installing.
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