ECOR 1010 Lecture Notes - Lecture 7: Technical Drawing

• School: Carleton University
• Department: Engineering Common Core Courses
• Course: ECOR 1010
• Professor: Glen Mc Rae

Document Summary

Standard drawing layout: the standard arrangement for a technical drawing is a three-view orthographic projection: Top view is located above front view. Right view is located to the right of frontview: the views must be aligned. Extension and centre lines: conventions, leave a gap between the end of an extension line and the object to which it refers (a, the short dashes of crossing perpendicular centre lines form a small cross (b) Orthographic projection - lines: when two or more lines coincide, there is a (cid:272)o(cid:374)(cid:448)e(cid:374)tio(cid:374) (cid:272)alled (cid:858)pre(cid:272)ede(cid:374)(cid:272)e of li(cid:374)es(cid:859) to establish which is visible. Define section views: centre lines: indicates centres of holes and symmetrical features of an object. The hidden line of the bottom edge takes precedence over the centre line of the hole. The visible line takes precedence over the hidden edge of the hole. When two or more lines coincide, there is a convention (cid:272)alled (cid:858)pre(cid:272)ede(cid:374)(cid:272)e of li(cid:374)es(cid:859) to establish which is visible.