Features Learning to read the information

1. Features�  Learning to read the information Every drawing should include all the information� however, it is not always clear unless you know what you are seeing.

2. Reading the numbers�.

3. Symbols� #X: This means that this applies throughout the drawing ___# of times. n This means diameter q This means centerline v This means Counterbore (a square cut oversized hole symmetrically around a smaller through hole x This means depth. This will be given when a hole, or counterbore does not go through the entire part. w This means countersink. When a hole has an interior chamfer this symbol is used. 8 2O Along with a countersink symbol, a degree value is given for the tapered angle. 17.08 When seeing a set of numbers 17.25 stacked, this is used to give a acceptable range (tolerance).

4. Continued R This means radius TYP This means typical and is used when a drawing has a situation that repeats itself and is constant. EQL SP Used when the distance between hole or features have a repeating value. Typically used in polar dimensioning . BC means bolt circle and is used when a circular centerline is used to make the center locations of a bolt pattern.

5. Understanding the terms.. This segment will help you identify and understand many of the terms used in the drafting/machining industry for specific features.