OK at the piston plant I worked at for ten years we would use a machine that had a ring of steel made that the skirt of the piston fit on real snug and would use a drawbar and a pin through the wrist pin hole to pull it tight on the ring. This machine would cut a profile on the lands and create what ever shape on the skirt, Barrel, half barrel taper etc.It was a Takesawa Cam turn. The tooling could go in and out as well as travel along the other axis of the part. Also pistons are not necessarily round and with a straight profile on the lands or the skirt. We had the blueprints for each part. OEM and aftermarket would be slightly different due to patent laws. Made a lot of parts for AC, Minneapolis, IH,JD, CAT, Cummins and others both OEM and aftermarket. The ring was a lot like a puck used to pull sleeves out, smaller than the O.D. but yet big enough to have very little free play on the inside. It had a step cut into it, and would be indicated in so they repeated dimensions.You can create a ring with some way to pull the piston into it,clamp the part and then chuck it into the lathe you could do it but it would take a lot of time.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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