TLE

• Each line has definite form and light weight.
• The standard thick line weight varies from 0.30 to 0.38 of an inch.
• The standard thin lines varies from 0.15 to 0.22cm of an inch.
• 11 main line types: Visible, hidden,center, dimentional,extension,leader,section,cutting plane,phantom,viewing plane,break.
• Visible lines are dark heavy lines , show the outline and shape of an object, define features you can see in a particular view.

  A) thick

  
• Hidden lines, light narrow,short,dashed lines, shows the outline of a feature that not be seen in a particular view, used to help clarify , a feature, but can be ommited if they clutter a drawing.

  A) medium

  
• Section lines - thin line usually drawn at a 45 degrees angle.

  Indicates the material that has been cut through in a sectional view.

  A) section lines

  
• Center lines - thin line consisting of long and short dashes, shows the center of holes, slots, paths, or rotation ans symetrical objects.

  A) center lines

  
• Dimention lines, show the lenght, width , and height of the features of an object.

  A) Dimention line

  
• Extension lines- used to show the starting and stopping points of a diameter , must have have atleast 1\16th space between the object and the extension line.

  A) Dimention line

  B) extension line

  
• Leader lines - thin lines , used to show the dimention of a feature it a note that is too larger to be placed beside the feature itself.

  A) leader line

  
• Cutting planes - thick broken line that is terminated with short 90 degrees arrowheads.

  A) cutting planes

  B) thick

  
• Break lines - used to break out sections for clarity or for a shortening part, there a three types of break lines , short breaks,long breaks, cylindrical breaks.
• Short break lines - thick wavy lines, used to break the edge or surfeace of a part for clarify og a hidden surface.

  A) thick

  
• Long break lines - long thin lines, used to show the middle section of an object has been removed so it can be drawn on a smaller piece of paper.

  A) thin long break line

  
• Cylindrical break lines - thin lines, used to show round parts that are broken in half to better clarify the print or tp reduce the lenght of the object.

  A) cylindrical break

  B) solid

  C) tubular

  
• Phantom lines - thin lines made up of long dashes alternating with pairs of short dashes.

  three purpose drawings:

  1. to show the alternate position of moving parts.
  2. to show the relationship of parts that fit together.
  3. ti shiw repeated detail.
• Alternate position:

  Phantom lines can show where a part is movint to and from.

  Eliminate the confusion of thinking there may be 2 parts instead of 1.

  A) phantom line

  
• Relationship of mating parts - phantom lines can also show how two or more parts go togethet without having to draw and dimension both parts.
• Repeated detail - phantom lines can show repeated detail of an object, saves the drafter time and the company money, less chance of drafter's error.