Scribing and Marking Tools

Accurate layout work in FRC depends on clearly marking where cuts and holes will be made. Scribing and marking tools help create precise, repeatable reference lines before drilling or cutting. 

 

 Pencil and Marker 

 

 Used for general layout on metal and plates 

 Easy to see and quick to apply 

 Best for rough or medium-precision marking 

 

 Limitations: 

 

 Can be thick or imprecise 

 Marks can wear off during handling 

 

 

 Scribe 

 A scribe is a sharp tool used to scratch fine lines into metal surfaces. 

 Advantages: 

 

 Very high precision 

 Permanent marking (does not wipe off easily) 

 Thin, accurate lines for hole centers and cut lines 

 

 Best use: 

 

 High-accuracy hole layout 

 Critical alignment features 

 Final marking before center punching 

 

 

 Combination Square 

 A combination square is used to mark straight, perpendicular lines. 

 Uses: 

 

 Drawing 90° lines from a datum edge 

 Checking squareness of parts 

 Extending measurement marks across a plate or extrusion 

 

 

 Speed Square 

 A speed square is used for quick and accurate right-angle marking. 

 Uses: 

 

 Fast layout on extrusion and plate 

 Marking cut lines 

 Checking alignment during fabrication 

 

 

 Best Practice 

 

 Always measure from a single datum first 

 Mark lightly before final scribing 

 Use a square tool to ensure all lines are perpendicular 

 Double-check critical marks before punching or drilling 

 

 

 Key Idea 

 Good fabrication starts with good marking. Scribes and squares turn measurements into accurate, repeatable reference lines that prevent errors during drilling and cutting.