1 / 18

Scaling and Dimensioning

Scaling and Dimensioning. Lecture 17. Topics For Today. Review Dimensioning Discuss Scaling and How To Use Your Scale AutoCAD 2D Book – Lesson #6 Wednesday – Lab #6 Gears, Sprockets and Chains Thursday – Quiz on Dimensioning!!!. Review – Dimensioning Terminology. Dimensioning.

mary-beard
Télécharger la présentation

Scaling and Dimensioning

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Scaling and Dimensioning Lecture 17 Autumn Quarter

  2. Topics For Today • Review Dimensioning • Discuss Scaling and How To Use Your Scale • AutoCAD 2D Book – Lesson #6 • Wednesday – Lab #6 • Gears, Sprockets and Chains • Thursday – Quiz on Dimensioning!!! Autumn Quarter

  3. Review – Dimensioning Terminology Autumn Quarter

  4. Dimensioning • The dimensions will be placed so that they all read from one direction • Lettering will be 1/8” high (3 mm) • Do Not Crowd – Use guidelines • 1st Dimension at least 3/8” (10 mm) away from object • Additional Dimensions should be placed ¼” (6 mm) away from the previous dimension Autumn Quarter

  5. Review – Dimensioning Standards (.25 in) (.375 in) Autumn Quarter

  6. Dimensioning Guidelines • Dimension positive cylinders on the non-circular view. • Dimension negative cylinders (holes) on the circular view • Precede the numerical value with a phi for all diameters Autumn Quarter

  7. Dimensioning Cylinders • Positive cylinders Negative cylinders Autumn Quarter

  8. Dimensioning Cylinders - Standards • Radii are used for half a cylinder or less • Locations of cylindrical features are given from center line to center line • Do not dimension to the curved boundary of a cylinder Autumn Quarter

  9. Dimensioning – A Procedure • Sketch Dimensions lightly on the first pass • Dimension Positive Shapes • Dimension negative shapes • Locate features by • Finished surface to finished surface • Finished surface to center line • Center line to center line • Other locating dimensions Autumn Quarter

  10. Dimensioning – A procedure (cont.) • Add notes • Check dimensions for completeness • Are any of them crowded? • Edit dimensioning • Darken dimensions Autumn Quarter

  11. Symmetry Holes in the center of a cylindrical object are automatically located Dimensioning Basic Shapes– Assumptions Autumn Quarter

  12. Scaling Drawings – Your Scale Full Size Inches – Increments of 50ths Full Size Metric – Increments of millimeters Full Size Inches – Increments of 1/32 Half Size Inches – Increments of 1/16 Autumn Quarter

  13. Notes on Scaling Drawings • Always Dimension with the True Dimension… no matter what the scale. • Be sure to include the scale used for the drawing in the title block. • There are many more scales available with different multiplication factors. Autumn Quarter

  14. Dimensioning with AutoCAD • Follow AC2D Lesson 6 closely to gain a working knowledge of the options for dimensioning with AutoCAD. • Setting up the dimension properties to match the drawing is very important. Autumn Quarter

  15. AutoCAD Dimensioning Notes • Linear Dimension vs. Aligned Dimension • A Linear Dimension is Horizontal or Vertical between any two points • An Aligned Dimension is created on the angle between the two points • Ordinate Dimensions • Locate all features with X or Y values based from an origin point • Used commonly with CNC Machines Autumn Quarter

  16. Common AutoCAD Dimensioning Practices • Do not adjust text size, arrow size, leader size, etc. in the Dimension Style Manager • Rather, adjust the Scale factor so all parts of the dimension are re-sized together. • Lesson 6 instructs you to adjust specific values – follow the steps given for this drawing. • Use Scale for most other drawings. Autumn Quarter

  17. PRACTICE PRACTICE PRACTICE!!! • The best way to learn any technique/subject is to practice • Try opening previous drawings and adding dimensions • Be careful to fully dimension the part without over-dimensioning • Ask the TA/Professor to check your work Autumn Quarter

  18. Assignments • Dwg 33 – AutoCAD 2D – Lesson #6 • Basic Dimensioning and Notes • Follow lesson – Print with standard title block • Dwg 34 – Scale 1-4, Scale 2-4, & Scale 3-4 • Practice with reading and creating dimensions on different scales. • Follow instructions on sheets Autumn Quarter

More Related