Bloomery-Crafting items must be held in the right slots and then you crouch to craft.
-Raw Iron [Mainhand, Count=3]
-Coal/Charcoal [Offhand, Count=1]
-Impure Iron Ingot(vhauled) [Mainhand, Count=1]
-Coal/Charcoal [Offhand, Count=1]
-Thin Iron Plate(vhauled) [Mainhand, Count=1]
-Coal/Charcoal [Offhand, Count=1]