Gadgets and Gizmos - Eccentric turning for crank pin with 4 jaw, demo

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• published: 12 Aug 2013
• views: 70551

Another attempt to demo a process. Let us say that you need to create a crank pin on a piece of large round stock. Here, we set up a piece of round bar in the four jaw chuck, to turn a pin - which for our purposes is to be a crank pin for - something! It's way off center and so setting up in itself presents some problems. We go through the process which here is tedious but - a method that can work. Ideally we go slow and generate a sequence of moves to achieve a result. My way if not everyone's! Further thought since putting this together over a few days -- further work could probably generate a crankshaft by removing a lot of material, and also the crank web could well be machined further for balance purposes. All just an imaginary and fairly basic project. A poor tripod and less than firm floor pick up movement unfortunately at times, worse on tight zooms - the lathe is mounted on a very substantial concrete base but the suspended floor not only creaks but also can pick up system movements from the concrete pad -- here aggravated by effects from an off-center rotating and significant mass. Add to that an inconsistent camera auto-focus and some sections are not as good as hoped for. Hope otherwise it may be of interest anyways. :-)