Answer / mohammad ammar

Heat transfer is the movement of heat and temperatur,while Mass transfer deals with concentrations of a particular substance.they are of two types;
1.mass transfer include diffusion
2.convection

We have fifteen year old CNC turning lathe,placed in dust proof room,recently giving control problems frequently.We are considering to retrofit it.Pl.brief me about various point I should consider for accessing the mechanical health of machine.

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