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SUBJECT: TOLERANCES AND MEASURING TECHNIQUE TOPIC: MEASURE ANGLE BY DIRECT METHOD Lecturers: TRẦN QUỐC HÙNG Member: TEAM 1.Phan Thế Quang MSSV: 15146090 (NT) 2.Trần Đăng Thục MSSV: 15146103 3.Phạm Bá Đức MSSV: 15146029 4.Nguyễn Hồng Sơn MSSV:15146091 5.Nguyễn Văn Sơn MSSV:15146092 BẢNG PHÂN CÔNG CÔNG VIỆC TÊN CÔNG VIỆC • • • 1.Phan Thế Quang • • • • • 2.Nguyễn Văn Sơn 3.Nguyễn Hồng Sơn 4.Phạm Bá Đức • 5.Trần Đăng Thục Home Điều chỉnh phần powerpoint Báo Cáo Thước đo góc Báo Cáo Dưỡng đo góc Căn mẫu đo góc Báo Cáo Điều chỉnh phần nội dung tiếng anh cho nhóm Các bạn làm xong nộp lại cho Thục để Thục sửa lại phần nội dung • End Calip côn giới hạn Next Báo Cáo Back MEASURE ANGLE BY DIRECT METHOD Angle Gauge Block Angle Gages Protractor Limit Gauge End Home Next Back Angle gauge block Uses • The angle of the measuring part is checking directly • Use to manufacture the angle templet, copying templet, thread cutter… • Use to check and calibrate other angle measuring instruments End Home Next Back Angle gauge block Structure • The angle gauge block are made into sets of pieces have different general angular dimension and with a minimum gradient of 1' • Types of anlge gauge block: Type I : use for small angle α ( α = 1' ÷ 9' ) End Home Next Back Angle gauge block Structure 0 Type II : use for the average angle α (α = 10 ÷ 79 ) End Home Next Back Angle gauge block Structure 0 Type III : use for big angle α (α = 80 ÷ 100 ) End Home Next Back Angle gauge block Structure 0 Type IV :Hexagonal with three angles α = 50 20', β = 118 40', γ = 180 End Home Next Back Angle gauge block Structure Type V : 8-sided prism or 12-sided prism End • 0 0 8-sided have these angles α = 45 , β = 90 , γ = 135 , δ = 180 • 0 0 0 12-sided have these angles 30 , 60 , 90 , 120 , 150 , 180 Home Next Back Angle gauge block Choose Angle gauge block Interlines to create corner : + Use a 16-piece model kit • pieces of angular size : 1º - 3º - 5º - 15º - 30º - 45º • pieces of angular size : 1’ – 3’ – 5’ – 20’ - 30’ • pieces of angular size : 1” – 3” – 5” - 20” – 30” + Plus and minus : End Home Next Back Angle Gages • Angle gage is an angular specimen have special construction and used for clinometer the surfaces, checking thread cutter and shaping cutter… End Home Next Back Angle Gages • The accuracy of angle gages depends on • Length edge of the checking angle • Surface roughness of gages and measuring part • The rate to evaluate the gaps between the gage and measuring part • The difference between the checking angle and gage can be calculated by the approximate formula a: is the number of gaps(mm) l: The length of the edge of the checking angle (mm) End Home Next Back Protractor Simple protractor • Don’t have the sliding scale, split level value is 30’ or • The accuracy is not high End Home Next Back Protractor Protractor has the sliding scale a Fixed Scale • Has En esventail shape and divided by degrees (a = c = ) b Sliding Scale • Moving around the fixed scale, has the smallest divide of c’ is 2’ or 5’ • The dividing a’ of sliding scale, calculating by the formula : a' = γ.c - c‘ End Home Next Back Protractor Ex: c’ = 5’= (1/12) , γ = 2,I have the dividing of a’ is 0 a’= 2- 1/30 = 59/30 = 55’ mean 23 on the sliding scale is divided into 12 equal segments End Home Next Back Protractor How to read measurement results of α : α = m + i.c’ m: It’s the lines number on the fixed scale on the left of number of the sliding scale i: It’s the “i”th line on sliding scale match with any line on the fixed scale End Home Next Back Protractor Ex: Read the result in figure H.2.1 End Home Next Back ĐUỔI HÌNH ĐOÁN ĐÁP ÁN Thư giãn CÂU 1: α = 40º30’ α = 42º55’ ĐÁP ÁN CHÍNH XÁC LÀ ? LIMIT GAUGE • Limit gauge is used to check the inner cone angle of the conical and outer cone angle of the conical End Home Next Back TYPES OF LIMIT GAUGE End Home Next Snap Gauges Plug Gauges Length Gauges Thread plug Gauges Thickness Gauges Back TYPES LIMIT GAUGE Snap Gauges Plug Gauges (inner Conical taper corner ) End Home Next Back TYPES LIMIT GAUGE Length Gauge Thread plug Gauges End Home Next Thickness Gauges Back CHECKING THE CONE ANGLE Example Quality Not Quality End Home Next Not Quality Back FINISH Thank you everyone for listening! End Home Next Back ... 4.Phạm Bá Đức • 5.Trần Đăng Thục Home Điều chỉnh phần powerpoint Báo Cáo Thước đo góc Báo Cáo Dưỡng đo góc Căn mẫu đo góc Báo Cáo Điều chỉnh phần nội dung tiếng anh cho nhóm Các bạn làm xong nộp... End Home Next Back Protractor Ex: Read the result in figure H.2.1 End Home Next Back ĐUỔI HÌNH ĐO N ĐÁP ÁN Thư giãn CÂU 1: α = 40º30’ α = 42º55’ ĐÁP ÁN CHÍNH XÁC LÀ ? LIMIT GAUGE • Limit gauge