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Erik's avatar

This is incredible, Ken! I will say that there are 5-axis CNC machines with articulated cutting heads that should be able to do this. These are used for tasks like porting cylinder heads and the cutting head can pivot by up to 60 degrees inside the chamber. Having said that, this is a specialized, modern computer controlled tool and will leave tool marks even if microscopic. So what I would like to know about these jars are “are there tool marks inside?” If there are no tool marks I’m thinking something like a water jet, laser, or maybe something ultrasonic was used to do the cutting. Extremely high tech stuff!

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Shannon's avatar

This is so cool! I hadn’t heard of these jars before, and here I thought I’d heard of all the most interesting OOParts!

So now I’m curious, what would you consider the most compelling out of place artifact of all?

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