LAB 3 Calibration 20F Hunny Vats 8817275

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Mechanical Engineering

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Feb 20, 2024

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L AB 3 Calibration Prerequisite: Chapter 9, Calibration Introduction: As indicated in the text, error is the enemy of measurement. To reduce the chance of error, we measure the measurement instrument to insure the readings given are as accurate as possible. Since each instrument exhibits its own metrological features, it would be too time consuming to focus on the calibration process on more than one instrument. Therefore, in this lab, we focus on calibrating a one-inch micrometer and provide insight on the process of calibration and how it works. Items needed:  1”-2” micrometer  Full set of gage blocks  Any specific adjustment tool required to set the zero point of the micrometer  Any necessary tools to assist in the disassembly and reassembly of the instrument Demonstration: Students should be fully capable of reliably reading a one-inch micrometer with accuracy and precision to the fourth decimal point. Students should be able to use the micrometer standard, and know how to "wring" gauge blocks together 27

28 L AB 7 Name: Hunny Vats Date: 20-03-2023 E XERCISE 1 Observation: Visually inspect the instrument. Using the classification of measurement errors guide ( Figure 9–5 ) identify and record any potential error attributes that may impact the calibration of a one-inch micrometer. Complete the pre-calibration checklist ( Figure 9– 7 ). The calibration of a one-inch micrometer can be affected by a number of potential error characteristics. They include incorrect setting for zero, measuring faces that are old or broken, measuring faces that are covered in dirt or debris, and poor micrometer use or handling. To achieve precise measurements, the micrometer needs to be periodically checked and maintained. Pre-Calibration Checklist : A. Identification 1. Does the information accompanying the instrument agree with the serial number and/or description of the instrument? yes 2. Do you have a history of the calibration? No 3. Do you have the instrument's instruction manual? No 4. Are you in possession of all relevant federal specifications? Yes 5. Do you have a user's account of actual or fictitious issues with the instrument? Yes 6. Do you know how to dispose of the instrument after it has been calibrated? No B. Requirements 1. Is the setting for the calibration appropriate for the anticipated precision? Have the drafts, fluctuations in temperature, vibration, and interference been minimized? Yes 2. Are appropriate standards available, and are they calibrated? Yes 3. Are the necessary accessories and instruments for calibration available, and are they calibrated? Yes 4. Is there a heat sink with enough space available? No 5. Are the necessary materials available? Yes 6. Are pencils and paper on hand? Yes 7. Are the materials for packaging available? Yes C. Preparation 1. Have the instrument, the standards, and the calibration instruments been normalized? Yes 2. Has the instrument been visually inspected? Yes 3. Have the reference and contact surfaces been inspected for damage, wear, and alignment? Yes E XERCISE 2 Calibration:

Confirm the zero setting of the instrument. Utilizing the supplied tool, adjust the instrument (if necessary) to achieve a zero setting. Start a calibration process by using a 1.000", a 1.200", a 1.400", a 1.600", a 1.800" and a 2.000" gauge block. Take instrument readings against the appropriate gage block and record the findings to full scale. Take the readings in both Ascending and Descending directions and record those findings on a spreadsheet, including the zero-setting and the Flatness/Parallelism check. S. No. Gauge block dimensions Ascending order readings Descending order readings 1. 1.000” 1.0318 1.0280 2. 1.200” 1.2164 1.2362 3. 1.400” 1.3978 1.4005 4. 1.600” 1.6216 1.6197 5. 1.800” 1.8241 1.8010 6. 2.000” 2.0244 2.0190 E XERCISE 3 Measurement confirmation: Create a graph similar to those shown in Figure 9–9, graphing both results on the same chart. Is the instrument linear? Is there any uncertainty? Is the instrument accurate? 1 2 3 4 5 0 0.5 1 1.5 2 2.5 1.03 1.22 1.4 1.82 2.02 1.03 1.24 1.4 1.8 2.02 Chart Title Ascending order Descending order This instrument can be considered linear according to the diagram but there’s always some kind of uncertainty that can be caused by humans while taking measurements.

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L AB 7 29 R EPORT Have students report their findings for Exercises 1-3. Use the following sections to create your report. Objective: The primary objective of this lab was to learn the calibrating techniques and using them, detecting any errors during calibration, and measuring the accuracy of the Micrometer. Instrument(s) and items used:  A one-inch micrometer  A wrench spanner to correct the zero-setting error if needed  A set of gauge blocks  Paper and pen  Cleaning liquids Environmental concerns: There was no environmental concerns as such because the room temperature was around 20 Degrees celcius, enough light was there and there was no dirt in the room. Data: S. No. Gauge block dimensions Ascending order readings Descending order readings 1. 1.000” 1.0318 1.0280 2. 1.200” 1.2164 1.2362 3. 1.400” 1.3978 1.4005 4. 1.600” 1.6216 1.6197 5. 1.800” 1.8241 1.8010 6. 2.000” 2.0244 2.0190

Conclusion: We used gauge blocks to calibrate the instrument. Taking readings of different sizes of gauges and repeating the process in opposite order helped us to get more precised readings and check whether the micrometer is calibrated or not. In conclusion, the micrometer was calibrated well and it was accurate but we there’s always some space for uncertainty.