lower down then we'll tear everything down and it will remain standing in the middle the experienced welder burns his way along the crankcase bit by bit after an hour the block is fully exposed the casting channel can be removed but the material that has been cut off is by no means scrap it will be needed for the next melt the overhead gantry then comes into action again it lifts the block to the next station a huge mechanical vibrator the deafeningly loud vibrations cause any remaining quartz sand to fall off it too