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To develop a technique to measure the diameter of crankshaft journal using three point contact / Muhammad Anees Abid

By: Abid, Muhammad Anees Contributor(s): Supervisor : Prof. Dr. Riaz Ahmed Mufti Material type: Text

TextIslamabad : SMME- NUST; 2023Description: 55p. Soft Copy 30cmSubject(s): MS Mechanical EngineeringDDC classification: 621 Online resources: Click here to access online Summary: The purpose of this project is to design and manufacture the crankshaft inspection machine. This machine will be able to measure the diameter of crankshaft journal using three-point contact for both 3 cylinder and 4 cylinders. The measurement is done using three LVDT sensors with an accuracy of +_1 micron which are pointed towards the center of the crankshaft journal. The sensors are attached with the C type block mechanism that takes the readings over defined intervals. Two centers, Head stock and pneumatic tail stock are used to hold the crankshaft in place while inspection. Sensors are stationary and the crankshaft rotates by the means of stepper motor attached via belt. Three-point measurement is done by calculating the coordinates of all three points and then by using the least square approximation method, the radii is calculated by simultaneously solving the circle equations. The accuracy and precision is specified by the drawings provided by OEM. The design is optimized to take readings for the journals in such a way that radial alignments of probes become irrelevant. It is mainly due to innovative arrangement that allows point contact to the journal surface and has not been seen in precision measurement industry.

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Item type	Current location	Home library	Shelving location	Call number	Status	Date due	Barcode	Item holds
Thesis	School of Mechanical & Manufacturing Engineering (SMME)	School of Mechanical & Manufacturing Engineering (SMME)	E-Books	621 (Browse shelf)	Available		SMME-TH-872

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The purpose of this project is to design and manufacture the crankshaft inspection machine. This
machine will be able to measure the diameter of crankshaft journal using three-point contact for
both 3 cylinder and 4 cylinders. The measurement is done using three LVDT sensors with an
accuracy of +_1 micron which are pointed towards the center of the crankshaft journal. The sensors
are attached with the C type block mechanism that takes the readings over defined intervals. Two
centers, Head stock and pneumatic tail stock are used to hold the crankshaft in place while
inspection. Sensors are stationary and the crankshaft rotates by the means of stepper motor attached
via belt. Three-point measurement is done by calculating the coordinates of all three points and
then by using the least square approximation method, the radii is calculated by simultaneously
solving the circle equations. The accuracy and precision is specified by the drawings provided by
OEM. The design is optimized to take readings for the journals in such a way that radial alignments
of probes become irrelevant. It is mainly due to innovative arrangement that allows point contact
to the journal surface and has not been seen in precision measurement industry.

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