A Fast and in-Situ Measuring Method Using Laser Triangulation Sensors for the Parameters of the Connecting Rod
Abstract
:1. Introduction
- (1)
- (2)
- (3)
- The data processing system is free from the NC system. Hence, it is easy to integrate the measuring head into diverse NC systems, regardless of the compatibility problem.
- (4)
- The measuring data are transmitted through wireless communication. In addition, this makes it possible to realize remote control.
2. The Measuring Principle
3. The Mathematical Measurement Model
3.1. Measuring of Inner Diameter
3.2. Measuring of Hole–Center Distance
- Deduction 1
- The distance between the measuring head and measured hole–center distance can be calculated from Equation (7).
- Deduction 2
- When the measuring head moves from Position 1 to Position 2, its moving distance can be acquired by the coordinate change of the CSNC.
- Deduction 3
- If two triangles have a common side and all the sides’ values are given, the distance between the two non-adjacent vertexes is unique and can be calculated by Equations (11) and (12).
4. The Error Discussion on Practical Application
4.1. Data Sample for Calibrating Intrinsic Parameters
4.2. Actual Measurement of a Connecting Rod
5. The Experiment
- Step 1
- The measuring head is installed onto the spindle of the NC machine.
- Step 2
- The lower bore gauge of the measuring head is put inside hole 1 (the smaller hole). The measurement data are transmitted to the data processing system through Bluetooth.
- Step 3
- The relative positions between the measuring head and the measured hole are changed three times and the measurement data with their corresponding coordinates in the CSNC are recorded.
- Step 4
- In a similar way, the bigger hole can be measured by the upper bore gauge of the measuring head.
- Step 5
- The measuring data are finally computed by the data processing system and shown on the liquid-crystal display.
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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The Lower Bore Gauge (°, mm) | |||||
θ1 | θ2 | θ3 | θ4 | θ5 | r |
29.832 | 29.316 | 1.283 | −1.119 | 1.938 | 71.3320 |
The Upper Bore Gauge (°, mm) | |||||
θ1 | θ2 | θ3 | θ4 | θ5 | r |
29.727 | 29.576 | −0.345 | 1.461 | 1.618 | 70.9794 |
Inner Diameter of Smaller Hole | Inner Diameter of Bigger Hole | Hole–Center Distance | |
---|---|---|---|
Measured value (mm) | 150.0172 | 275.0231 | 350.0063 |
Standard value (mm) | 150.0227 | 275.0292 | 350.0185 |
Measuring error (μm) | 5.5 | 6.1 | 12.2 |
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Li, X.-Q.; Wang, Z.; Fu, L.-H. A Fast and in-Situ Measuring Method Using Laser Triangulation Sensors for the Parameters of the Connecting Rod. Sensors 2016, 16, 1679. https://doi.org/10.3390/s16101679
Li X-Q, Wang Z, Fu L-H. A Fast and in-Situ Measuring Method Using Laser Triangulation Sensors for the Parameters of the Connecting Rod. Sensors. 2016; 16(10):1679. https://doi.org/10.3390/s16101679
Chicago/Turabian StyleLi, Xing-Qiang, Zhong Wang, and Lu-Hua Fu. 2016. "A Fast and in-Situ Measuring Method Using Laser Triangulation Sensors for the Parameters of the Connecting Rod" Sensors 16, no. 10: 1679. https://doi.org/10.3390/s16101679
APA StyleLi, X. -Q., Wang, Z., & Fu, L. -H. (2016). A Fast and in-Situ Measuring Method Using Laser Triangulation Sensors for the Parameters of the Connecting Rod. Sensors, 16(10), 1679. https://doi.org/10.3390/s16101679