DIMENSION NOTES

Basics

• should be for the convenience of the person reading the drawing
• no calculations should be necessary
• no duplications
• drawn to scale but workers should never ahve to scale drawing

Extension Lines

• when dimensioning numbers and arrows inside are 1st choice
• 2nd choice is number inside arrows outside
• 3rd choice is both outside
• should be attached to center lines and 1/16 in. from object lines

Leaders

• leaders used to dimension circles, arcs, notes, and other details
• criss-cross as little as possible
• arrow to edge, dot to surgace
• 1/4 in. tail
• any angle except horizontal or vertical
• do not pass through corners
• make it as short as possible
• needs to point directly to the center

Linear Dimensions

• first three big dimensions
• biggest height, width, length
• dimension inbetween views when possible
• dimension off view where detail is the best described
• DO NOT DIMENSION FROM A HIDDEN LINE
• locate things from a common corner
• smallest dimension closest to object
• NO DUPLICATIONS
• arcs are dimensioned as a radius, circles as a diameter
• cylinder in right side view, hole where it is showed as circle
• check mark indicates finished surfaces