Architectural Drafting Equipment Chapter 2 Architectural Drafting Equipment

Links for Chapter 2 Drafting Supplies Drafting Instruments Drafting Machines Scales

Drafting Supplies Mechanical Pencils - The lead is manually inserted and sharpened as needed Automatic Pencils - The lead advances as button or tip is pushed Lead Grades - Depends on the type of line Thick Lines - 2H to F Thin Lines - 4H to H

Drafting Supplies Pencil Motion - Keep pencil tilted at 45º with the direction of travel Provide even pressure to create sharp crisp lines Slowly Rotate the mechanical pencil as the line is drawn Practice this technique as often as possible

Drafting Supplies Technical Pens - Used to create inked lines Erasers - Use the correct eraser for the job Do not press too hard to rip the material Erasing shields protect good lines Use a dust brush to remove the eraser particles

Drafting Instruments Compasses - Used to draw circles and arcs Drop-bow is used for small circles Center-wheel is used by professional drafters Beam is used for large arcs or circles Keep the compass needle sharp and the lead point sharpened like a chisel point

Drafting Instruments Dividers - Used to transfer dimensions or divide distances Parallel Bar - Slides up and down the drafting board by cables mounted on pulleys Triangles - Two standard types 30º-60º-90º is known as 30º-60º triangle 45º-45º-90º is known as 45º triangle

Drafting Instruments Templates - A plastic sheet that contains standard symbols used for tracing Be sure the scale matches your drawing Keep both sides clean Irregular Curves - There is no constant radii and is commonly called a French curve

Drafting Machines Arm Drafting Machine - The arm clamps to the table and the head can rotate to a variety of angles with different scales attached to it Track Drafting Machine - The traversing arm moves left and right across the table and the head can also lock and pivot

Scales Notation - Scale of the drawing is noted in each title block Architecture - 1/4”=1’-0” or 1”=1’-0” Civil - 1”=50’ or 1”=500’ Metric - Scale is based on the meter (m) unit Millimeter (mm) is most commonly used on drawings

Scales Architect’s Scale - Contain 11 different scales Locate the correct scale before beginning Ten of the scales are based on the inch unit Other scale is divided into 1/16th of an inch Be careful when reading from left to right The 1/4”=1’-0” is the most common scale

Scales Civil Engineer’s Scale - Contain 11 different scales Locate the correct scale before beginning The scales are based on the inch unit in multiples of 10 Be careful when reading from left to right The 50 scale is most popular