# lecture3 - MECH 220 Intro to Engineering CAD Auxiliary...

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10/17/2006 1 Inst. Charbel Seif , MECH 220 10/17/2006 1 MECH 220 MECH 220 Intro to Engineering CAD Intro to Engineering CAD Auxiliary Views Auxiliary Views FALL 2006-07 Inst.: Charbel Seif Office: Wing B - B-303 Extension: 3629 e-mail: [email protected] Inst. Charbel Seif , MECH 220 10/17/2006 2 MECH 220: 3rd LECTURE MECH 220: 3rd LECTURE Topics Topics ± Concept & Definition ± Glass Box Projection ± Learning how to plot primary auxiliary views ± Drawing Curved Shapes ± Learning how to plot secondary auxiliary views ± Sketching Exercise

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10/17/2006 2 Inst. Charbel Seif , MECH 220 10/17/2006 3 MECH 220: 3rd LECTURE MECH 220: 3rd LECTURE Auxiliary Views Auxiliary Views Concept & Definition Inst. Charbel Seif , MECH 220 10/17/2006 4 MECH 220: 3rd LECTURE MECH 220: 3rd LECTURE AUXILIARY VIEWS: AUXILIARY VIEWS: Synonymous to Auxiliary : Supplementary Supportive Helpful Assistant Therefore , Auxiliary Views can be defined as Helper Views that: Reveal the true shape and size of those features located on angled surfaces without any distortions when viewed from planes parallel to those angled surfaces.
10/17/2006 3 Inst. Charbel Seif , MECH 220 10/17/2006 5 MECH 220: 3rd LECTURE MECH 220: 3rd LECTURE AUXILIARY VIEWS: AUXILIARY VIEWS: ± Auxiliary views are often used to show inclined and oblique surfaces true size. Inclined and oblique surfaces do not show true size in the standard views. ± Auxiliary views are orthographic views taken from a direction of sight other than top, front, right side, left side, bottom, or rear. ± Primary auxiliary views are projected onto a plane that is perpendicular to only one of the principal planes of projection and is inclined to the other two. ± Secondary auxiliary views are projected from primary auxiliary views. Inst. Charbel Seif , MECH 220 10/17/2006 6 ± Principal faces of the above object are not parallel to the standard planes of projection. ± The auxiliary view shows the true size and shape of the hole feature. MECH 220: 3rd LECTURE MECH 220: 3rd LECTURE AUXILIARY VIEWS: AUXILIARY VIEWS:

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4 Inst. Charbel Seif , MECH 220 10/17/2006 7 MECH 220: 3rd LECTURE MECH 220: 3rd LECTURE AUXILIARY VIEWS: AUXILIARY VIEWS: Principles Principles ± When orthographic views are not adequate to fully describe a part, auxiliary views are used to complete the job ± Extra auxiliary view helps to show the hole as a circle. Inst. Charbel Seif , MECH 220
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## This note was uploaded on 02/07/2011 for the course MECH 220 taught by Professor Charbelseif during the Fall '06 term at American University of Beirut.

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lecture3 - MECH 220 Intro to Engineering CAD Auxiliary...

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