Thuyết trình ĐO GÓC BẰNG PHƯƠNG PHÁP TRƯC TIẾP

Thuyết trình ĐO GÓC BẰNG PHƯƠNG PHÁP TRƯC TIẾP . Đây là 1 phần nội dung thuyết trình cho bộ môn Dung Sai Kỹ Thuật Đo. file POWERPOINT đảm bảo cho các bạn có nội dung hoàn hảo, với các hiệu ứng đẹp mắt.

3.Nguyễn Hồng Sơn • Dưỡng đo góc

4.Phạm Bá Đức • Căn mẫu đo góc

1. Angle Gauge Block

1. 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

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2 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' )

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2 Structure

Type V : 8-sided prism or 12-sided prism

• 8-sided have these angles α = 450, β = 900, γ = 1350, δ = 1800

• 12-sided have these angles 300, 600, 900, 1200, 1500, 1800

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3 Choose Angle gauge block

Interlines to create 1 corner :

+ Use a 16-piece model kit

• 6 pieces of angular size : 1º - 3º - 5º - 15º - 30º - 45º

• 5 pieces of angular size : 1’ – 3’ – 5’ – 20’ - 30’

• 5 pieces of angular size : 1” – 3” – 5” - 20” – 30”

+ Plus and minus :

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3 Choose Angle gauge block

QUESTION:

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• Angle gage is an angular specimen have special construction and used for clinometer the surfaces, checking thread cutter and shaping cutter….

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• 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)

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1 Simple protractor

•.Don’t have the sliding scale, split level value is 30’ or 10

•.The accuracy is not high

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2 Protractor has the sliding scale

Ex: c’ = 5’= (1/12) 0 , γ = 2,I have the dividing of a’ is

a’= 10 2- 1/30 = 59/30 = 1055’ mean 230 on the sliding scale is divided into 12 equal segments

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How to read measurement results of α :

m: It’s the lines number on the fixed scale on the left of number 0

of the sliding scale

i: It’s the “i”th line on sliding scale match with any line on the fixed scale

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α = m + i.c’

Ex: Read the result in figure H.2.1

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ĐÁP ÁN CHÍNH XÁC LÀ ?

• Limit gauge is used to check the inner cone angle of the conical and outer cone angle of the

conical

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Thank you everyone for listening!

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