Here's a way to get approximately the right ratios without calculating anything in Factorio. This "subfactory" makes blue chips. Each component is independently infinitely expandable in one direction. I make a small
Splitting in strange ratios : r/factorio
Steam Community :: Guide :: Factorio - Everything To Do With Smelting: Belt & Bot Based
Factorio": How to Build a Furnace/Smelting Setup - LevelSkip
Wiki ratios up to date? : r/factorio
Steam Community :: Guide :: Factorio - Everything To Do With Smelting: Belt & Bot Based