Metrology Lab 1 Fall 2023 -modified-1
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MACH8006 - LAB 1
Name:_Naved Karakandy____
___
_ Date:
25/09/2023
Prerequisite: Completion of assigned readings.
Introduction:
In this lab, students will explore variation, accuracy, precision, and repeatability. The lab
includes a number of exercises, each adding more variation to the simple process of
cutting a straw, until the final exercise, which is designed to help improve accuracy and
precision, and to reduce variation as much as possible.
Add more lines to your answers
as necessary.
Items needed:
A variety of scissors and plastic straws
SAE and metric rulers of various lengths and discriminations
Name and Student Number:
Naved Karakandy
8946802
Date: 25/09/2023
1.
Was there variation in the length of each segment compared to the other? If so, how much?
Write your measurement data down Here.
After the initial cut the variation was negligible, a deviation of 0.5 mm was noticed. After
the 2
nd
and 3
rd
cut variations increased exponentially. The detailed description regarding the
measurements is given below:
Length of the straw when provided was 213 mm.
Length after cut into halves
106 mm
107mm
Length after cut into Quarters
53 mm
54mm
53mm
55mm
MACH8006 - LAB 1
Name:_Naved Karakandy____
___
_ Date:
25/09/2023
2.
Was each segment cut accurately?
No, there was deviation from the required standard length after each cut. The straw was 213 mm in
length and if I cut it accurately, I get 2 pieces of 106.5 mm. At the first cut a deviation of 0.5 mm was noted
and after the second cut the deviations in length was increased and it shows the lack of accuracy in cutting.
3.
Was each segment cut with the same precision?
precision was there after each cut. After straw was cut in to two pieces deviation was 0.5 mm and after being cut in to
quarters the deviation remains almost same with respect to each piece
.
MACH8006 - LAB 1
Name:_Naved Karakandy____
___
_ Date:
25/09/2023
Discuss possible methods of improving precision and accuracy and reducing
variation.
In general, there are several methods we can implement to achieve higher
precision and accuracy and reducing variation. I think
use of standards, calibration, collaboration and automation are perfect methods we
can use to achieve these goals.
use of standards – using certified standards will help reduce variation and it
definitely help to precision and accuracy
calibration – we need to calibrate our instruments and measuring equipment’s
regularly to ensure accuracy.
Collaboration – collaborating with friends and experts in the field will help to
exchange ideas and gain good knowledge and guidance in the field.
Automation – it is also an important factor which reduce variation and errors
because automation is a factor invented to reduce human errors.
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MACH8006 - LAB 1
Name:_Naved Karakandy____
___
_ Date:
25/09/2023
1. Accuracy can only be checked by comparison with:
a. another technician or metrologist
b. a trade group
c. a higher standard
d. your boss
2. Measurement is most important to which one of the following applications?
a. Mass production of automotive parts
b. Mass production of aircraft parts
c. One-of-a-kind handicrafts
d. All manufacturing e. Manufacturing of parts from prepared plans
3. Measurement involves fundamental qualities. Select three qualities from the following list.
a. Roundness
b. Mass
c. Flatness
d. Time
e. Weight
f. Modules of elasticity
g. Length
h. Width
i. Hardness
4. Which of the following best defines “dimensional metrology?”
a. The measurements required to manufacture products
b. Measurements found by the use of scales and other measuring instruments
c. The measurement of lines, areas, volumes, and angles
d. The measurement of real things, whether they be steel, wood, plastic, or any other material
e. The measurement of lines, circles, and angles
5. Select one or more of the following that are not considered to be dimensional metrology.
a. Bolt circle spacing
b. The selection of lubricants for a given bearing allowance
c. The torque requirement for a bolted assembly
d. The tolerance required for a shaft in a bearing
e. The size limits of a mass-produced replacement part
6. The role of the inspector in industry emerged as the result of which one of the following circumstances?
a. Weapons were first mass produced.
b. Gunpowder changed the threat from weapons.
c. Foremen could not keep up with mass production rates.
d. The piece-part system was introduced.
e. Precision measurement tools such as the micrometer were introduced to industry.
7. Of the following characteristics, select the ones that affect quality control.
a. Employee morale
b. Pride of product
c. Dimensional measurements
d. Environmental conditions
e. Product specifications
MACH8006 - LAB 1
Name:_Naved Karakandy____
___
_ Date:
25/09/2023
8. For every act of dimensional metrology, one or more of the following variables may apply. Identify the single most
important variable.
a. Number of decimal places
b. Metric or customary system
c. Reliability
d. Repeatability
e. Sensitivity
9. In this text, metrological methods or principles are emphasized rather than the measuring instruments themselves. There
are several reasons for this. Which of the following is the most important reason?
a. There is no complete agreement about the instruments.
b. Instrument manufacturers provide detailed information.
c. Principles are more interesting than methods of use.
d. Principles and methods are easily adaptable to all instruments.
Discussion Question
10. Small errors can cost a company billions of dollars or have dire consequences.
Discuss the potential impact that small errors can have in the following industries: • Automotive • Aerospace •
Biotech/Medical
Normally we neglect small errors while doing something. But in fields like automotive, aerospace
and medical industries a small error will leads to the loss of millions and billions of dollars. There are
already proven examples for the impact of small errors caused in several industries.
In 2009, Toyota encountered a significant crisis when the incorrect installation of an all-weather
floor mat in its SUVs resulted in accelerator pedals getting stuck, leading to numerous accidents. This
incident serves as a prominent illustration of how a minor error can result in substantial financial losses for
a company.
Additionally, it resulted in a significant time wastage as Toyota had to recall and repair all the
defective vehicles.
In the aerospace industry, there have been instances where minor errors resulted in substantial
financial losses and tragic loss of life, such as the Boeing 737 MAX crashes. One of these accidents
occurred due to a malfunctioning sensor falsely indicating slow aircraft speed, leading to the deaths of
hundreds of people and significant financial repercussions for the company.
The medical industry is of paramount importance, demanding a focused effort to eliminate errors.
It is an area where nations invest millions of dollars, and even a minor mistake can result in loss of life and
legal consequences.
Generally, small errors can lead to financial setbacks, wasted time, higher expenses, customer
dissatisfaction, legal issues, and significant harm to a company's reputation.