Factorio Forums

The arithmetic combinator cant multiply properly. It can multiply properly with other ores from what I cant test, just seem to get this behaviour for copper.
It works for some numbers but not others strangely enough.

The number seems to roll into the negative without reason. Picture below says it all.

running version 0.15.30

This is caused by integer overflow - if the result of an operation exceeds the range of a 32-bit integer (about 2.15 billion) it will wrap around and become negative.

Based on: viewtopic.php?f=23&t=48386 not a bug.

Now I know the problem I have put in a work around.
Thanks