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1. Prototype 2. Refine prototype 3. Finished part That’s my sequence of operations
But there's an old Phillips' Rule that states, "If the 3rd attempt fails, consider another job.".
I’m wondering if you just haven’t gotten the “feel” of your new machines yet.
If you have a real big concern about how square the bore is to either end, you can cheat a bit by making your piston about .003" undersize and use a Viton ring on it. This will tolerate a bit of misalignment.---Brian