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Advanced Machining and Stress Relief

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How Racing Engine Parts Are Made! CP Carrillo Factory Tour & Behind The Scenes (Rods & Pistons)

What happens here

After rough milling, pistons undergo further machining on CNC lathes. This process involves operations such as facing the top of the piston, turning the outer diameter (OD), and roughing out the ring grooves. The goal at this stage is to remove as much material as possible to relieve internal stresses and minimize subsequent machining requirements. This is a critical step in achieving the desired shape and preparing the piston for final finishing, ensuring that less material needs to be removed in later, more precise operations.

Goal: Refine piston shape, create initial features, and relieve material stress.

Tools and materials

  • CNC Lathes Mori Seiki — Performing precision turning operations on pistons, including facing, OD turning, and roughing ring grooves
  • Rough-Milled Pistons N/A — Pistons that have completed the initial rough milling stage

What they say

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doesn't so after the initial Milling operation apparently we stack them so we have a rough Milling um basically we take apart and we remove as much material from it as possible so that we relieve that and the Machine as little as humanly possible down the line listen all the different live Tooling in there and that is that one's cutting ring grooves roughing yeah so it's facing the top of the Piston it's turning the OD it's it's roughing the ring grooves and a variety of other things so that that way when we finish the part on the Finish lathe there's not a whole lot of work to do and there's not a lot of material to be removed so that's what it looks like prior to going into the machine coming out of the machine you'll get all your different things that we just mentioned basically it's similar and in most regards to the other parts are just different in size or there might be some dimensional characteristics that are different but in general that's what you're gonna get to look like when it's coming off of this operation I think people can use their imagination yeah there's there's so many different thing is going through here it's not just like a factory where the same four things get made all the time I mean we

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