"Christopher Tidy" wrote in message
...

Am Freitag, 15. Mai 2020 14:12:09 UTC+2 schrieb Bob Engelhardt:
On 5/14/2020 9:44 PM, Christopher Tidy wrote:
I guess maybe the core was built on a steel hoop made from bent round
bar, or something like that? Not sure how you hold the back end
positioned to 1/8" accuracy, though.


Then how would you get the rod out of the casting?

I guess you'd have to make some kind of rod framework which could be
unscrewed or broken up from the ends. Not sure though. The core positioning
just looks really hard, and these guys did it perfectly.
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The "chaplets", metal shims that hold the sand core centered, partly melt
and disappear into the casting.

https://www.giessereilexikon.com/gie...2619cd2ceb9f1c