Basic Dimensioning Practices Sacramento City College EDT 310 EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Practices Dimensional information includes Size dimensions. Location dimensions. Notes. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Practices Size Dimensions Size dimensions provide the size of physical features. A feature is any physical portion or characteristic of a part or object such as: Diameter of holes Width Length Depth EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Shapes EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Flat Surfaces Dimension flat surfaces by giving measurements for each feature. Architectural drafting - show all dimensions. Refer to Figures 18-17, 18-18 EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Architectural Style EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Mechanical Style EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Cylindrical Shapes The diameter and the length can be dimensioned in one view. Use the view where the cylinder appears rectangular. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Cylindrical Shapes EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Square Features Dimensioning Square/Rectangular shapes Dimension in views where the length and height are shown. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Square Features EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Conical Shapes Dimensioning Cones and Regular Polygons Conical shapes - dimension two ways: 1. Give the diameters at both ends and the length. 2. Give the taper angle and length. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Conical Shapes #1 EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Conical Shapes #2 EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Regular Polygons Regular Polygon shapes – Dimension by giving the distance across the flats and the length. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Location Dimensions Location dimensions provide the location of physical features on the object. Location of holes from end Datum Dimensioning Chain Dimensioning Location of windows/doors in buildings EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Location dimensions are used to locate features on an object. Holes Offsets Location dimensions do not provide size. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Holes and arcs are dimensioned in the view where they appear circular. Rectangular features are dimensioned to their edges. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Two types of location dimensioning systems Rectangular coordinates and Polar coordinates EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Rectangular coordinates are linear dimensions used to locate features from surfaces, centerlines or center planes Use DIMLINEAR command. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Rectangular Coordinate Location Dimensions EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Rectangular Coordinate Location Dimensions EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Polar Coordinate Location Dimensions EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Polar Coordinate Location Dimensions EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions In architectural drafting, windows and doors are dimensioned to their centers on the floor plan. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Location Dimensions Polar coordinates uses angular dimensions to locate features from surfaces, centerlines or center planes. Use DIMANGULAR command. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Notes EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Notes Notes Notes give information about individual or specific features on the drawing. Two types Specific Notes General Notes EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Notes Specific notes Relate to individual or specific features on the drawing. They are attached to the feature with a leader line. General Notes Apply to the entire drawing and Are placed together in one area of the drawing. Exact location depends on sheet size, and industry, company or school practice. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Notes EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Standards EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Standards Each drafting field uses a different type of dimensioning technique Architectural. Mechanical. Civil. Electronics. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Standards Drafters should place dimensions in accordance with company and industry standards. Use the company standard FIRST. When no company standard exists, use industry standards. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Standards Dimensioning standards are used so an object designed in one place can be manufactured or built somewhere else. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Standards ASME Y-14.5M-1994 Dimensioning and Tolerancing Standard emphasized in the textbook. M - means metric. 1994 is the year it was published. ASME is the American Society of Mechanical Engineers. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Formats EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Formats Unidirectional Dimensioning is “Unidirectional” means one direction. All dimension numbers and notes are placed horizontally on the drawing sheet. Numbers are read from left to right when viewed from the bottom of the drawing sheet. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Formats Aligned Dimensioning is Used on architectural drawings. Horizontal dimensions are read horizontally. Vertical dimensions are read vertically from the right edge of the sheet. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Formats EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimension Styles used by Particular Field of Work EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensions - Mechanical Mechanical Field. Uses Unidirectional dimensioning Dimensioning parts. Dimension Characteristics 1. Uses arrowheads for terminators. 2. Dimension line is broken 3. Dimension number is centered inside dimension line. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensions - Mechanical EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensions - Architectural Architectural Field. Uses Aligned dimensioning Dimension Characteristics 1. Uses “tic” marks for terminators. 2. Dimension line is unbroken. 3. Dimension number is centered over dimension line. 4. Dimension is aligned with surface. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensions - Architectural EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Practices EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Practices Dimensioning practices depend on Product requirements. What are you making? Manufacturing accuracy. Extreme precision vs approximate dimensions. Standards. What dimension standards exist for your industry? Tradition. How has your industry dimensioned in the past? EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Practices Compare dimensioning practices for: Automobile. (decimal inches) Architecture. (feet, inches, fractions of inch) Microprocessor chip. (1/10,000 to 1/100,000 of an inch Civil. (Miles or kilometers) Each dimension type is appropriate for that discipline. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Practices Precision is indicated by decimal places Automobile. (decimal inches) 3 inches vs 3.0010 inches Architecture. 40.343245 feet (???) !! Civil. 40.365789 miles (???) !! Precision must be appropriate for that discipline. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Practices The number of decimal places shown on a dimension increases manufacturing costs! Paper weight measurements 3.0000” x 4.0000” x 2.0000” Vs 3” x 4” x 2” EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Circles EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Circles Circles are normally dimensioned by giving the diameter. Per ASME standard, arcs are dimensioned by giving the radius. AutoCAD lets you dimension a circle or an arc by giving the diameter dimension. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Circles Diameter dimensions are produced by: Picking the Diameter Dimension button on the Dimension Toolbar. OR Picking Diameter in the Dimension pull-down menu. Typing DDI or DIMDIAMTER at the Command: prompt. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Circles When you use the DIMDIAMETER command, a leader line and diameter dimension value are attached to the cursor when you pick the circle or arc. The leader can be dragged to any desired location and length before picking where you want it to be placed. The Mtext, Text and Angle options are available. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Holes EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Holes Holes are dimensioned in the view where they appear as circles. To dimension holes: Give location dimensions to the center and a leader showing the diameter. Use the DIMDIAMETER command to dimension the diameter. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Repetitive Features EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Repetitive Features Repetitive features are dimensioned by: The number of repetitions Followed by an X, a space, and the size dimension. The dimension is then connected to the feature with a leader. Refer to Figure 18-37. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Arcs EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Arcs The standard for dimensioning arcs is the radius. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Arcs Use the DIMRADIUS command to place a radius command by: Picking the Radius Dimension button on the Dimension toolbar. OR Picking Radius in the Dimension pull-down menu. Typing DRA or DIMRADIUS at the Command: prompt. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Fillets and Rounds EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Fillets and Rounds Small inside arcs are called fillets Fillets are designed to strengthen inside corners. Small arcs on outside corners are called rounds. Rounds are used to relieve sharp corners Dimension each one individually as arcs or as a general note. See Figure 18-39. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Angles EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Angles Coordinate and angular dimensioning are both acceptable for dimensioning angles. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Angles Coordinate dimensioning uses coordinates to specify the length of line segments to start locations of angles. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Angles Angular dimensioning Locates one corner with a dimension and provides the value of the angle in degrees. You can dimension the angle between any two non-parallel lines. EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices Dimensioning Curves Where possible, curves are dimensioned as arcs. Where curves are not of a constant-radius, Dimension them to points along the curve using the DIMLINEAR command. See Figure 18-40. EDT 310 - Chapter 18 - Basic Dimensioning Practices
Dimensioning Chamfers A chamfer is an angled surface used to relieve sharp corners. To dimension chamfers: Show angle and a linear dimension OR Two linear dimensions EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices
EDT 310 - Chapter 18 - Basic Dimensioning Practices