The table of your sewing machine cabinet needs to be about 28 inches from the floor to the top of the cabinet or when sitting at your sewing machine your arms for a 90 degree angle when placed on the cabinet. This prevents back and shoulder pain. This comes from a lady that wrote an ergonomic book on this issue as well as being ergonomically correct. All of my cabinets are 28 inches from floor to cabinet top. If your machine sits on a table and not in a cabinet the same remains for ergonomics.