"Christopher Tidy" wrote in message
...

Am Samstag, 16. Mai 2020 16:43:31 UTC+2 schrieb Jim Wilkins:

The "chaplets", metal shims that hold the sand core centered, partly melt
and disappear into the casting.

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

Ah, now I understand. The chaplets only partially melt. Brilliant. Thanks
for the answer, Jim!

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That's what the Wiki said:
https://en.wikipedia.org/wiki/Core_(manufacturing)
You may have to append a final ")" to visit the page.
"Since the chaplets become part of the casting, the chaplets must be of the
same or similar material as the metal being cast. Moreover, their design
must be optimized because if they are too small they will completely melt
and allow the core to move, but if they are too big then their whole surface
cannot melt and fuse with the poured metal."