Originally Posted by
Simon MacGowen
I'm afraid you have been fooled or misled by all the "dead square", "dead straight" preaching often seen in books and magazines. Out of squareness happens all the time in fine furniture making. When we build cabinets with inset doors, we use techniques to get the doors or drawers done with perfect reveals, regardless of whether or not the carcases are perfectly square. I know because I have done that many times.
Same for dead flat, unless you work with sheet stock. Wrong, even if you work with sheet goods, flatness is not guaranteed. I know because I have made long/large tables or desks with both veneer sheet stock and hardwood lumber, and they are rarely "perfectly" flat. By the way, I use long aluminum straight edges, not steel ones to check flatness.
Simon