Before the middle of the 18th century WOOD:the main material used in engineering structure LATHES:the machine tools mainly used to cut these material Exceptions:boring of cannon,production of metal screws and small instrument parts
Before the middle of the 18th century WOOD: the main material used in engineering structure LATHES: the machine tools mainly used to cut these material Exceptions: boring of cannon, production of metal screws and small instrument parts
>In the middle of 18th century The Steam The First Major Engine Developments In Metal Cutting Why? Because the steam engine needs: Large metal cylinders and other parts Very high dimensional accuracy
Why? Because the steam engine needs: Large metal cylinders and other parts Very high dimensional accuracy The Steam Engine The First Major Developments In Metal Cutting In the middle of 18th century
The materials for the first steam engines were gray cast iron(灰铸铁) wrought iron(熟铁) brass_ (黄铜) bronze(青铜)
The materials for the first steam engines were gray cast iron ( 灰铸铁） wrought iron （熟铁） brass （黄铜） bronze （青铜）