machinist square
A machinist square or engineer's square is the metalworkers' equivalent of a try square. It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°. In the accompanying image, there is evidence of pinning at the intersection of the blade and body, where the heads of two pins are visible as dark circles.
In use the body is aligned against the one edge of the object and the blade is presented to the end or body of the object. If
the end is being checked, then a strong light source behind the square will show any mismatch between the blade of the square and
the end of the object. The purpose of this action is to either check for squareness or to
mark out the body of the workpiece.
Squares must be occasionally checked for accuracy. The four disk method is one way to do this.
References
 Metalworking:
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Hand tools: |
Ball-peen hammer • Combination square • Drift pin • File • File card • Hammer • Hand scraper • Machinist square • Magnetic base • Peening • Pliers • Power tool • Punch • Rotary tool • Scriber • Throatless shear • Tongs • Tool • Vise • Workbench • Wrench |
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Metalworking measuring instruments: |
Bore gauge • Caliper • Dial indicator • Engineer's blue • Feeler • Fishtail-Center • Gauge blocks • Gauge • Go-NoGo • Machinist square • Marking blue • Marking gauge • Marking out • Micrometer • Radius gauge • Ruler • Sine bar • Spirit level • Straightedge • Surface plate • Tape measure • Thread pitch • Vernier height • Vernier scale • Wiggler |
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Casting • CNC • Cutting tools • Drilling and threading • Fabrication • Finishing • Grinding • Jewellery • Lathe • Machining • Machine tooling • Measuring • Metalworking • Hand tools • Metallurgy • Milling • Occupations • Press tools • Smithing • Terminology • Welding |
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