"Sawing" is cutting something (in half) with a saw, like a piece of wood or a log. "Planing" has several meanings. If it is being used with "sawing," the it is referring to the tool that shapes/flattens wood, called a "plane" "Machining" is not a commonly used phrase in American English - I had to look it up. :-) It's a technical term for cutting/removing pieces of wood. I hope this helped! :-)

You'd probably have to be a carpenter or work with wood to know the differences. Most people don't! I'm not an expert in woodwork but I would say that: Sawing - chopping a piece of wood with a saw, which means that there is a back and forth motion of the blade which is usually serrated (with teeth) Planing - trying to make a surface smooth or flat. So you shave off small bits of wood to try and achieve an overall smooth or sculpted piece of wood. Machining - not 100% sure what this one is but I assume it means chopping or shaping wood with a machine of some kind! You'd probably get better answer by googling them as they are slightly technical terms.