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Robins SG8, which is a valve seat and guide machine used in engine rebuilding.
Seat and guide machines are used to machine the valve seats and guides in cylinder heads. Valve seats are the areas where the valves meet the cylinder head, and they need to be precisely machined to ensure a proper seal. Valve guides are the sleeves that the valves slide through, and they also need to be machined to ensure a proper fit.
There are two main types of seat and guide machines: manual and CNC. Manual machines are operated by hand, while CNC machines are controlled by a computer. CNC machines are more accurate and repeatable than manual machines, but they are also more expensive.