1. Engineering Concepts Chapter 1 Terms

2. CENTER LINE  A line consisting of a long dash followed by a short dash, that is used to show and locate centers of arcs and circles, and to describe the center axis of cylindrical forms.

3. CUT  Inventor software command that removes material from a solid model.

4. DIMENSION  Numerical value used on a drawing to describe location, size, shape, or geometric characteristic.

5. EXTRUDE  Inventor software command that adds material to a sketch or existing solid model.

6. EXTENSION LINE  Thin lines used to establish the extent of a dimension.

7. HIDDEN LINE  Lines used to show details not visible from a particular view.

8. INDUSTRIAL AGE  Age characterized by the advent of manufacturing machinery and the movement of populations to cities from farms.

9. INFORMATION AGE  Age characterized by the rise of Internet communications.

10. INNOVATION  The introduction of something new; a new idea, method, or device.

11. ISOMETRIC  A drawing projected so that the plane of projection of a three- dimensional drawing forms equal angles (120 degrees) to each of the three axes of the object.

12. OBJECT LINE  Slightly lighter than a profile line, used to add all details to a sketch.

13. ORTHOGRAPHIC  Right angle projection. The views of an object are drawn in perpendicular planes to one another.

14. PROPORTIONAL  Comparative relationship between things with respect to size.

15. SCALE  The ability to change the proportions or size of one part of the image in relationship to the other.

16. SECTION LINE  A line or pattern used to represent the presence of a particular material in an engineering drawing.

17. SKETCH  A freehand drawing of an idea, or solution to a problem without concern for detail.

18. SPACE AGE  Relating to, or befitting the age of space exploration.

19. STONE AGE  The first known period of prehistoric human culture characterized by the use of stone tools.

20. SURFACE  A two-dimensional area on a plane.

21. VIEWS  The different viewing perspectives found in mechanical drawing.