A combination square is such a ubiquitous tool that many woodworkers take it for granted and do not get the most from it. Let’s take a look at some of the more interesting uses for this tool.
Anatomy of a Combination Square
The Rule or Blade
This straight edge is used to determine flatness of a surface. Better-quality rules are hardened steel and accurately etched.
The Anvil
Sometimes called the "head", the anvil can be used alone or in combination with the rule. The anvil contains a draw bolt that secures the rule and is tightened via a thumbscrew. This innovation is the primary driver of the combination square’s popularity: it allowed the user to adjust the rule, something you could not do with a traditional fixed-blade try square.
The Scriber
This sharp marking device is built into the anvil. It is used to accurately scribe or scratch a line. This tool-within-a-tool comes in handy in the field if you don’t have a marking knife, or need more accuracy than a pencil can provide. The scratched-in scribe lines also have the advantage of not smearing.
