Those materials were not difficult to machine using hardened carbon steel tools (cutter). Cutting speed should be kept very low to avoid rapid failure of the cutting tools. It required 27 and half working days to bore and face one of Watt's large cylinders[4].Those materials were not difficult to machine using hardened carbon steel tools (cutter). Cutting speed should be kept very low to avoid rapid failure of the cutting tools. It required 27 and half working days to bore and face one of Watt’s large cylinders[4]