Gear Metrology - me.iitb.ac.inramesh/courses/ME338/metrology8.pdf · Functions of a Gear • Power...
Transcript of Gear Metrology - me.iitb.ac.inramesh/courses/ME338/metrology8.pdf · Functions of a Gear • Power...
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Gear Metrology
ME 338: Manufacturing Processes II
Instructor: Ramesh Singh; Notes: Profs. Singh/Kurfess1
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Gear
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh; Notes: Profs.
Singh/Kurfess
![Page 3: Gear Metrology - me.iitb.ac.inramesh/courses/ME338/metrology8.pdf · Functions of a Gear • Power transmission • Change rotational speed/torque • Maintain constant speed ratio](https://reader030.fdocuments.us/reader030/viewer/2022040123/5e0f2991ec62980e876a3f67/html5/thumbnails/3.jpg)
Functions of a Gear
• Power transmission
• Change rotational speed/torque
• Maintain constant speed ratio
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh; Notes: Profs.
Singh/Kurfess
![Page 4: Gear Metrology - me.iitb.ac.inramesh/courses/ME338/metrology8.pdf · Functions of a Gear • Power transmission • Change rotational speed/torque • Maintain constant speed ratio](https://reader030.fdocuments.us/reader030/viewer/2022040123/5e0f2991ec62980e876a3f67/html5/thumbnails/4.jpg)
Gear Box
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh; Notes: Profs.
Singh/Kurfess
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Gear Kinematics
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh; Notes: Profs.
Singh/Kurfess
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Line of Action
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh; Notes: Profs.
Singh/Kurfess
![Page 7: Gear Metrology - me.iitb.ac.inramesh/courses/ME338/metrology8.pdf · Functions of a Gear • Power transmission • Change rotational speed/torque • Maintain constant speed ratio](https://reader030.fdocuments.us/reader030/viewer/2022040123/5e0f2991ec62980e876a3f67/html5/thumbnails/7.jpg)
Involute Profile
• Formed by unwrapping a tangent chord from the base circle
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
![Page 8: Gear Metrology - me.iitb.ac.inramesh/courses/ME338/metrology8.pdf · Functions of a Gear • Power transmission • Change rotational speed/torque • Maintain constant speed ratio](https://reader030.fdocuments.us/reader030/viewer/2022040123/5e0f2991ec62980e876a3f67/html5/thumbnails/8.jpg)
Definitions
• Diametral pitch, P = N/D
• Module M is reciprocal of P = D/N
• Circular pitch = πM (arc on pitch circle from flank of one tooth to other tooth)
• Base pitch = Pb = πM cosφ• Base pitch = Pb = πM cosφ
• Addendum = M
• Dedendum = 1.157 M/1.250M/1.400M
• Clearance = Dedendum-addendum
• M, N, φ are required for characterization
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
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Gear Measurement
• General Tests
• Measurement of individual elements
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
Dual flank test
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Test Results
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
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Gear Tooth Measurement-Gear Tooth Vernier
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
W=NMsin(90/N)
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Base Tangent Method
• Single tooth measurement has errors so multiple
teeth can be measured at one go
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
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Base Tangent Method
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
++−=
N
S
NNMW
22tancos
ππφφφ
Where N=No. of teeth; M=Module; φ=Pressure angle;
S= No. of tooth spaces in W
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Pitch Measurement
Gage A is constant
due to gear indexing
Any change in gage B shows
That there are errors
ME 338: Manufacturing Processes IIInstructor: Ramesh Singh
That there are errors