Tham khảo tài liệu 'process planning episode 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Drawing interpretation 75 A 1 I I RevNoj Revision note 2 3 I Date 4 _ signature Checked B c D E F 15 10 SIDE ELEVATION ITEM No Quantity 1500 Drawn by Sarah Scallan ELEVATION 50 30 2 HŨLES 010 PLAN Surface finish N9 unless otherwise stated All dimensions unless otherwise stated A_I Matt. Spec. I Checked by c. Mathieson c I D I E I Mild Steel File name Fig 3 10 H A B c D E Approved by - date PS - 16 04 01 JH Engineering Ltd. Figure Component in first angle projection AU dimensions in mm Scale Date Drawn 09 04 01 F Machined Block SHS 1604 99 01 Edition 0 4 Sheet 1 1 76 Process Planning A 1 I RevNo Revision note 2 3 I Date 4 signature Checked A B c D E F ELEVATION ITEM No A Quantity 1500 Drawn by Lauren Hall Natl. Spec. I Checked by Carly Scallan c I D I E Mild Steel Approved by - date PS - 16 04 01 JH Engineering Ltd. 15 10 SIDE ELEVATION All dimensions in mm File name Date Drawn 09 04 01 Scale LEH 0208 87 02 Edition 0 4 Sheet 1 1 B c D E F Machined Block Figure Component in third angle projection Drawing interpretation 77 Figure a First angle projection symbol b Third angle projection symbol SECTION A-A Figure Example of a sectional view Sectioning As stated above orthographic projection is the method of detailing a threedimensional object on a two-dimensional plane using a number of different views. However for many components these views may not be sufficient to depict all details. This could be due to hidden or internal features that cannot be shown regardless of what view or views are taken. Although hidden details are generally illustrated by using broken lines these can make a view look more complex. Therefore in these instances a sectional view would be used. The sectional view is obtained by cutting the component in two using a designated cutting plane which in many instances will be a centte line. The view is then drawn as if the part is cut in two and the hidden or internal details are shown. The surface that
