How to process the thin wall slender tube with one end closed and the other end contracted?

This part depends on the batch, single small batch rod car, but the cost is very high, but also consider the possibility of scrap.

It is recommended to use stainless steel tubes for large quantities. Use stainless steel tube with od 12 and wall thickness 2.5. According to the length of the residual blanking, wall thickness and 7.8 cars out. The bottom is cut with a 12-bar lathe or milling machine, and after welding with argon arc welding, the outer circular grinding knife.

Because I do not know other technical requirements, I just consider the shape.

Personal experience is for reference. Further discussion is welcome. thank you

One more thing: from the two sizes of 11.8 and 7.8, it can be inferred that the processing method this designer considers is steel pipe, because it is very suitable to use steel pipe with outer circle 12 and wall thickness 2.5 to make these two sizes. Mass production, after welding a rough grinding knife, and then centerless grinding machine, very high efficiency.

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