Combination Squares

A combination square is a versatile adjustable measuring tool that quickly and accurately measures objects for precise work. The combination square is an essential tool for any tool box, more used for meticulous work than production work. This hand tool comes in various sizes ranging from small ones you can keep in your pocket to larger heavy-duty ones that come with all the attachments for bigger jobs.
Combination squares are multifunctional hand tools which can consist of a:
• Square head (also known as a miter head or an anvil) – has a slot which the rule fits through which is locked in place by a screw. Made from die-cast alloy, aluminium, cast iron (strong and resistant to oils and chemicals). More expensive ones are made of forged and hardened steel.
• Rule or blade - manufactured from steel or hardened and tempered steel, accurate markings (metric and imperial) etched into the steel rules, thicker steel blades are better.
• Level bubble vial – acts like a spirit level
• Protractor head – used to set and mark angles
• Centre Finder – easily indicates centre of a round object
• Scriber to mark lines – usually inserted in the end
The heads need changing in order to use the other devices. They are precision instruments which need to be stored carefully as damage to the tool can cause inaccuracies.
Combination Squares are used for:
• Measuring straight lines perpendicular to an edge
• Measuring 90 degree and 45 degree angles
• Drawing lines parallel to the edge
• Easy to lay out a triangular
• Adjustable depth for repetition marking and scribing
• Marking a line around a post or bean for cutting
• Find centre of a round object for example, dial or rod
• Measuring the depth of a groove
• Determining flatness
• Setting bits and blades for example, height of blade
• Use the rule/blade on its own as a ruler
• Fine-tune a machine
• Projector heads - finds any angles you require
• Some have spirit levels on the tool ideal for small jobs
Who uses one?
• Woodworkers
• Stonemasons
• Metalworkers
• Engineers